diff --git a/.eslintrc.js b/.eslintrc.js
index 2b5ea3d6..605a3f43 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -10,4 +10,8 @@ module.exports = {
   ecmaFeatures: {
     modules: false
   },
+
+  rules: {
+    'no-use-before-define': 2,
+  },
 };
diff --git a/README.md b/README.md
index 7b41a8c3..d0aecf7e 100644
--- a/README.md
+++ b/README.md
@@ -101,51 +101,47 @@ guide](https://github.com/airbnb/javascript/blob/7684892951ef663e1c4e62ad57d662e
 jscodeshift -t react-codemod/transforms/sort-comp.js <path>
 ```
 
-### Explanation of the ES2015 class transform
-
-  * Ignore components with calls to deprecated APIs. This is very defensive, if
-    the script finds any identifiers called `isMounted`, `getDOMNode`,
-    `replaceProps`, `replaceState` or `setProps` it will skip the component.
-  * Replaces `var A = React.createClass(spec)` with
-    `class A (extends React.Component) {spec}`.
-  * Pulls out all statics defined on `statics` plus the few special cased
-    statics like `propTypes`, `childContextTypes`, `contextTypes` and
-    `displayName` and assigns them after the class is created.
-    `class A {}; A.foo = bar;`
-  * Takes `getDefaultProps` and inlines it as a static `defaultProps`.
-    If `getDefaultProps` is defined as a function with a single statement that
-    returns an object, it optimizes and transforms
-    `getDefaultProps() { return {foo: 'bar'}; }` into
-    `A.defaultProps = {foo: 'bar'};`. If `getDefaultProps` contains more than
-    one statement it will transform into a self-invoking function like this:
-    `A.defaultProps = function() {…}();`. Note that this means that the function
-    will be executed only a single time per app-lifetime. In practice this
-    hasn't caused any issues – `getDefaultProps` should not contain any
-    side-effects.
-  * Binds class methods to the instance if methods are referenced without being
-    called directly. It checks for `this.foo` but also traces variable
-    assignments like `var self = this; self.foo`. It does not bind functions
-    from the React API and ignores functions that are being called directly
-    (unless it is both called directly and passed around to somewhere else)
-  * Creates a constructor if necessary. This is necessary if either
-    `getInitialState` exists in the `React.createClass` spec OR if functions
-    need to be bound to the instance.
-  * When `--no-super-class` is passed it only optionally extends
-    `React.Component` when `setState` or `forceUpdate` are used within the
-    class.
-
-The constructor logic is as follows:
-
-  * Call `super(props, context)` if the base class needs to be extended.
-  * Bind all functions that are passed around,
-    like `this.foo = this.foo.bind(this)`
-  * Inline `getInitialState` (and remove `getInitialState` from the spec). It
-    also updates access of `this.props.foo` to `props.foo` and adds `props` as
-    argument to the constructor. This is necessary in the case when the base
-    class does not need to be extended where `this.props` will only be set by
-    React after the constructor has been run.
-  * Changes `return StateObject` from `getInitialState` to assign `this.state`
-    directly.
+### Explanation of the new ES2015 class transform with property initializers
+1. Determine if mixins are convertible. We only transform a `createClass` call to an ES6 class component when:
+  - There are no mixins on the class, or
+  - `options['pure-component']` is true, the `mixins` property is an array and it _only_ contains pure render mixin (the specific module name can be specified using `options['mixin-module-name']`, which defaults to `react-addons-pure-render-mixin`)
+2. Ignore components that:
+  - Call deprecated APIs. This is very defensive, if the script finds any identifiers called `isMounted`, `getDOMNode`, `replaceProps`, `replaceState` or `setProps` it will skip the component
+  - Explicitly call `this.getInitialState()` and/or `this.getDefaultProps()` since an ES6 class component will no longer have these methods
+  - Use `arguments` in methods since arrow functions don't have `arguments`. Also please notice that `arguments` should be [very carefully used](https://github.com/petkaantonov/bluebird/wiki/Optimization-killers#3-managing-arguments) and it's generally better to switch to spread (`...args`) instead
+  - Have inconvertible `getInitialState()`. Specifically if you have variable declarations like `var props = ...` and the right hand side is not `this.props` then we can't inline the state initialization in the `constructor` due to variable shadowing issues
+  - Have non-primitive right hand side values (like `foo: getStuff()`) in the class spec
+3. Transform it to an ES6 class component
+  1. Replace `var A = React.createClass(spec)` with `class A extends React.Component {spec}`. If a component uses pure render mixin and passes the mixins test (as described above), it will extend `React.PureComponent` instead
+    - Remove the `require`/`import` statement that imports pure render mixin when it's no longer being referenced
+  2. Pull out all statics defined on `statics` plus the few special cased statics like `childContextTypes`, `contextTypes`, `displayName`, `getDefaultProps()`, and `propTypes` and transform them to `static` properties (`static propTypes = {...};`)
+    - If `getDefaultProps()` is simple (i.e. it only contains a return statement that returns an object) it will be converted to a simple assignment (`static defaultProps = {...};`). Otherwise an IIFE (immediately-invoked function expression) will be created (`static defaultProps = function() { ... }();`). Note that this means that the function will be executed only a single time per app-lifetime. In practice this hasn't caused any issues — `getDefaultProps` should not contain any side-effects
+  3. Transform `getInitialState()`
+    - If there's no `getInitialState()` or the `getInitialState()` function is simple (i.e., it only contains a return statement that returns an object) then we don't need a constructor; `state` will be lifted to a property initializer (`state = {...};`)
+      - However, if the object contains references to `this` other than `this.props` and/or `this.context`, we can't be sure about what you'll need from `this`. We need to ensure that our property initializers' evaluation order is safe, so we defer `state`'s initialization by moving it all the way down until all other property initializers have been initialized
+    - If `getInitialState()` is not simple, we create a `constructor` and convert `getInitialState()` to an assignment to `this.state`
+      - `constructor` always have `props` as the first parameter
+      - We only put `context` as the second parameter when (one of) the following things happen in `getInitialState()`:
+        - It accesses `this.context`, or
+        - There's a direct method call `this.x()`, or
+        - `this` is referenced alone
+      - Rewrite accesses to `this.props` to `props` and accesses to `this.context` to `context` since the values will be passed as `constructor` arguments
+        - Remove _simple_ variable declarations like `var props = this.props;` and `var context = this.context`
+      - Rewrite top-level return statements (`return {...};`) to `this.state = {...}`
+        - Add `return;` after the assignment when the return statement is part of a control flow statement (not a direct child of `getInitialState()`'s body) and not in an inner function declaration
+  4. Transform all non-lifecycle methods and fields to class property initializers (like `onClick = () => {};`). All your Flow annotations will be preserved
+    - It's actually not necessary to transform all methods to arrow functions (i.e., to bind them), but this behavior is the same as `createClass()` and we can make sure that we won't accidentally break stuff
+  5. Rewrite `AnotherClass.getDefaultProps()` to `AnotherClass.defaultProps`
+4. Generate Flow annotations from `propTypes` and put it on the class (this only happens when there's `/* @flow */` in your code and `options['flow']` is `true`)
+  - Flow actually understands `propTypes` in `createClass` calls but not ES6 class components. Here the transformation logic is identical to [how](https://github.com/facebook/flow/blob/master/src/typing/statement.ml#L3526) Flow treats `propTypes`
+  - Notice that Flow treats an optional propType as non-nullable
+    - For example, `foo: React.PropTypes.number` is valid when you pass `{}`, `{foo: null}`, or `{foo: undefined}` as props at **runtime**. However, when Flow infers type from a `createClass` call, only `{}` and `{foo: undefined}` are valid; `{foo: null}` is not. Thus the equivalent type annotation in Flow is actually `{foo?: number}`. The question mark on the left hand side indicates `{}` and `{foo: undefined}` are fine, but when `foo` is present it must be a `number`
+  - For `propTypes` fields that can't be recognized by Flow, `$FlowFixMe` will be used
+
+#### Usage
+```bash
+./node_modules/.bin/jscodeshift -t ./transforms/class.js --mixin-module-name=react-addons-pure-render-mixin --flow=true --pure-component=true --remove-runtime-proptypes=false <path>
+```
 
 ### Recast Options
 
diff --git a/npm-shrinkwrap.json b/npm-shrinkwrap.json
new file mode 100644
index 00000000..d1bd92af
--- /dev/null
+++ b/npm-shrinkwrap.json
@@ -0,0 +1,2980 @@
+{
+  "name": "react-codemod",
+  "version": "4.0.0",
+  "dependencies": {
+    "abab": {
+      "version": "1.0.3",
+      "from": "abab@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/abab/-/abab-1.0.3.tgz"
+    },
+    "abbrev": {
+      "version": "1.0.9",
+      "from": "abbrev@>=1.0.0 <1.1.0",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.9.tgz"
+    },
+    "acorn": {
+      "version": "3.2.0",
+      "from": "acorn@>=3.2.0 <4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-3.2.0.tgz"
+    },
+    "acorn-globals": {
+      "version": "1.0.9",
+      "from": "acorn-globals@>=1.0.4 <2.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-globals/-/acorn-globals-1.0.9.tgz",
+      "dependencies": {
+        "acorn": {
+          "version": "2.7.0",
+          "from": "acorn@>=2.1.0 <3.0.0",
+          "resolved": "https://registry.npmjs.org/acorn/-/acorn-2.7.0.tgz"
+        }
+      }
+    },
+    "acorn-jsx": {
+      "version": "3.0.1",
+      "from": "acorn-jsx@>=3.0.0 <4.0.0",
+      "resolved": "https://registry.npmjs.org/acorn-jsx/-/acorn-jsx-3.0.1.tgz"
+    },
+    "align-text": {
+      "version": "0.1.4",
+      "from": "align-text@>=0.1.3 <0.2.0",
+      "resolved": "https://registry.npmjs.org/align-text/-/align-text-0.1.4.tgz"
+    },
+    "alter": {
+      "version": "0.2.0",
+      "from": "alter@>=0.2.0 <0.3.0",
+      "resolved": "https://registry.npmjs.org/alter/-/alter-0.2.0.tgz"
+    },
+    "amdefine": {
+      "version": "1.0.0",
+      "from": "amdefine@>=0.0.4",
+      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.0.tgz"
+    },
+    "ansi-escapes": {
+      "version": "1.4.0",
+      "from": "ansi-escapes@>=1.1.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-escapes/-/ansi-escapes-1.4.0.tgz"
+    },
+    "ansi-regex": {
+      "version": "2.0.0",
+      "from": "ansi-regex@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.0.0.tgz"
+    },
+    "ansi-styles": {
+      "version": "2.2.1",
+      "from": "ansi-styles@>=2.2.1 <3.0.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz"
+    },
+    "ansicolors": {
+      "version": "0.2.1",
+      "from": "ansicolors@>=0.2.1 <0.3.0",
+      "resolved": "https://registry.npmjs.org/ansicolors/-/ansicolors-0.2.1.tgz"
+    },
+    "argparse": {
+      "version": "1.0.7",
+      "from": "argparse@>=1.0.7 <2.0.0",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.7.tgz"
+    },
+    "arr-diff": {
+      "version": "2.0.0",
+      "from": "arr-diff@>=2.0.0 <3.0.0",
+      "resolved": "https://registry.npmjs.org/arr-diff/-/arr-diff-2.0.0.tgz"
+    },
+    "arr-flatten": {
+      "version": "1.0.1",
+      "from": "arr-flatten@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/arr-flatten/-/arr-flatten-1.0.1.tgz"
+    },
+    "array-differ": {
+      "version": "1.0.0",
+      "from": "array-differ@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-differ/-/array-differ-1.0.0.tgz"
+    },
+    "array-equal": {
+      "version": "1.0.0",
+      "from": "array-equal@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-equal/-/array-equal-1.0.0.tgz"
+    },
+    "array-find-index": {
+      "version": "1.0.1",
+      "from": "array-find-index@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-find-index/-/array-find-index-1.0.1.tgz"
+    },
+    "array-union": {
+      "version": "1.0.2",
+      "from": "array-union@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-1.0.2.tgz"
+    },
+    "array-uniq": {
+      "version": "1.0.3",
+      "from": "array-uniq@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/array-uniq/-/array-uniq-1.0.3.tgz"
+    },
+    "array-unique": {
+      "version": "0.2.1",
+      "from": "array-unique@>=0.2.1 <0.3.0",
+      "resolved": "https://registry.npmjs.org/array-unique/-/array-unique-0.2.1.tgz"
+    },
+    "arrify": {
+      "version": "1.0.1",
+      "from": "arrify@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/arrify/-/arrify-1.0.1.tgz"
+    },
+    "asn1": {
+      "version": "0.2.3",
+      "from": "asn1@>=0.2.3 <0.3.0",
+      "resolved": "https://registry.npmjs.org/asn1/-/asn1-0.2.3.tgz"
+    },
+    "assert-plus": {
+      "version": "0.2.0",
+      "from": "assert-plus@>=0.2.0 <0.3.0",
+      "resolved": "https://registry.npmjs.org/assert-plus/-/assert-plus-0.2.0.tgz"
+    },
+    "ast-traverse": {
+      "version": "0.1.1",
+      "from": "ast-traverse@>=0.1.1 <0.2.0",
+      "resolved": "https://registry.npmjs.org/ast-traverse/-/ast-traverse-0.1.1.tgz"
+    },
+    "ast-types": {
+      "version": "0.8.12",
+      "from": "ast-types@0.8.12",
+      "resolved": "https://registry.npmjs.org/ast-types/-/ast-types-0.8.12.tgz"
+    },
+    "async": {
+      "version": "1.5.2",
+      "from": "async@>=1.0.0 <2.0.0",
+      "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz"
+    },
+    "aws-sign2": {
+      "version": "0.6.0",
+      "from": "aws-sign2@>=0.6.0 <0.7.0",
+      "resolved": "https://registry.npmjs.org/aws-sign2/-/aws-sign2-0.6.0.tgz"
+    },
+    "aws4": {
+      "version": "1.4.1",
+      "from": "aws4@>=1.2.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.4.1.tgz"
+    },
+    "babel-code-frame": {
+      "version": "6.11.0",
+      "from": "babel-code-frame@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.11.0.tgz"
+    },
+    "babel-core": {
+      "version": "6.10.4",
+      "from": "babel-core@>=6.0.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.10.4.tgz"
+    },
+    "babel-eslint": {
+      "version": "6.1.0",
+      "from": "babel-eslint@>=6.0.5 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-eslint/-/babel-eslint-6.1.0.tgz"
+    },
+    "babel-generator": {
+      "version": "6.11.0",
+      "from": "babel-generator@>=6.9.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.11.0.tgz"
+    },
+    "babel-helper-call-delegate": {
+      "version": "6.8.0",
+      "from": "babel-helper-call-delegate@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-call-delegate/-/babel-helper-call-delegate-6.8.0.tgz"
+    },
+    "babel-helper-define-map": {
+      "version": "6.9.0",
+      "from": "babel-helper-define-map@>=6.9.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-define-map/-/babel-helper-define-map-6.9.0.tgz"
+    },
+    "babel-helper-function-name": {
+      "version": "6.8.0",
+      "from": "babel-helper-function-name@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-function-name/-/babel-helper-function-name-6.8.0.tgz"
+    },
+    "babel-helper-get-function-arity": {
+      "version": "6.8.0",
+      "from": "babel-helper-get-function-arity@>=6.8.0 <7.0.0",
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+    },
+    "babel-helper-hoist-variables": {
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+      "resolved": "https://registry.npmjs.org/babel-helper-hoist-variables/-/babel-helper-hoist-variables-6.8.0.tgz"
+    },
+    "babel-helper-optimise-call-expression": {
+      "version": "6.8.0",
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+      "resolved": "https://registry.npmjs.org/babel-helper-optimise-call-expression/-/babel-helper-optimise-call-expression-6.8.0.tgz"
+    },
+    "babel-helper-regex": {
+      "version": "6.9.0",
+      "from": "babel-helper-regex@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-regex/-/babel-helper-regex-6.9.0.tgz"
+    },
+    "babel-helper-replace-supers": {
+      "version": "6.8.0",
+      "from": "babel-helper-replace-supers@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-helper-replace-supers/-/babel-helper-replace-supers-6.8.0.tgz"
+    },
+    "babel-helpers": {
+      "version": "6.8.0",
+      "from": "babel-helpers@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-helpers/-/babel-helpers-6.8.0.tgz"
+    },
+    "babel-jest": {
+      "version": "13.2.2",
+      "from": "babel-jest@>=13.0.0 <14.0.0",
+      "resolved": "https://registry.npmjs.org/babel-jest/-/babel-jest-13.2.2.tgz"
+    },
+    "babel-messages": {
+      "version": "6.8.0",
+      "from": "babel-messages@>=6.8.0 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-messages/-/babel-messages-6.8.0.tgz"
+    },
+    "babel-plugin-check-es2015-constants": {
+      "version": "6.8.0",
+      "from": "babel-plugin-check-es2015-constants@>=6.3.13 <7.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-check-es2015-constants/-/babel-plugin-check-es2015-constants-6.8.0.tgz"
+    },
+    "babel-plugin-constant-folding": {
+      "version": "1.0.1",
+      "from": "babel-plugin-constant-folding@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-constant-folding/-/babel-plugin-constant-folding-1.0.1.tgz"
+    },
+    "babel-plugin-dead-code-elimination": {
+      "version": "1.0.2",
+      "from": "babel-plugin-dead-code-elimination@>=1.0.2 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-dead-code-elimination/-/babel-plugin-dead-code-elimination-1.0.2.tgz"
+    },
+    "babel-plugin-eval": {
+      "version": "1.0.1",
+      "from": "babel-plugin-eval@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-eval/-/babel-plugin-eval-1.0.1.tgz"
+    },
+    "babel-plugin-inline-environment-variables": {
+      "version": "1.0.1",
+      "from": "babel-plugin-inline-environment-variables@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-inline-environment-variables/-/babel-plugin-inline-environment-variables-1.0.1.tgz"
+    },
+    "babel-plugin-jest-hoist": {
+      "version": "13.2.2",
+      "from": "babel-plugin-jest-hoist@>=13.2.2 <14.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-jest-hoist/-/babel-plugin-jest-hoist-13.2.2.tgz"
+    },
+    "babel-plugin-jscript": {
+      "version": "1.0.4",
+      "from": "babel-plugin-jscript@>=1.0.4 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-jscript/-/babel-plugin-jscript-1.0.4.tgz"
+    },
+    "babel-plugin-member-expression-literals": {
+      "version": "1.0.1",
+      "from": "babel-plugin-member-expression-literals@>=1.0.1 <2.0.0",
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+    },
+    "babel-plugin-property-literals": {
+      "version": "1.0.1",
+      "from": "babel-plugin-property-literals@>=1.0.1 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-property-literals/-/babel-plugin-property-literals-1.0.1.tgz"
+    },
+    "babel-plugin-proto-to-assign": {
+      "version": "1.0.4",
+      "from": "babel-plugin-proto-to-assign@>=1.0.3 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-proto-to-assign/-/babel-plugin-proto-to-assign-1.0.4.tgz",
+      "dependencies": {
+        "lodash": {
+          "version": "3.10.1",
+          "from": "lodash@>=3.9.3 <4.0.0",
+          "resolved": "https://registry.npmjs.org/lodash/-/lodash-3.10.1.tgz"
+        }
+      }
+    },
+    "babel-plugin-react-constant-elements": {
+      "version": "1.0.3",
+      "from": "babel-plugin-react-constant-elements@>=1.0.3 <2.0.0",
+      "resolved": "https://registry.npmjs.org/babel-plugin-react-constant-elements/-/babel-plugin-react-constant-elements-1.0.3.tgz"
+    },
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+          "version": "1.2.1",
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+          "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz"
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+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz"
+        }
+      }
+    },
+    "uglify-to-browserify": {
+      "version": "1.0.2",
+      "from": "uglify-to-browserify@>=1.0.0 <1.1.0",
+      "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz"
+    },
+    "underscore": {
+      "version": "1.6.0",
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+      "resolved": "https://registry.npmjs.org/underscore/-/underscore-1.6.0.tgz"
+    },
+    "user-home": {
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+    "util-deprecate": {
+      "version": "1.0.2",
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+    },
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+    },
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+    },
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+    },
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+    },
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+          "resolved": "https://registry.npmjs.org/cliui/-/cliui-3.2.0.tgz"
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+      }
+    },
+    "yargs-parser": {
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+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-2.4.0.tgz"
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+}
diff --git a/package.json b/package.json
index 31ce4496..74a148d1 100644
--- a/package.json
+++ b/package.json
@@ -9,14 +9,14 @@
     "lint": "eslint ."
   },
   "dependencies": {
-    "jscodeshift": "^0.3.23",
+    "jscodeshift": "^0.3.25",
     "babel-eslint": "^6.0.5",
     "babel-plugin-transform-object-rest-spread": "^6.6.5",
     "babel-preset-es2015": "^6.6.0",
-    "babel-jest": "^12.1.0",
+    "babel-jest": "^13.0.0",
     "eslint": "^2.13.1",
     "fbjs-scripts": "^0.7.1",
-    "jest-cli": "^12.1.0"
+    "jest-cli": "^13.0.0"
   },
   "jest": {
     "automock": false,
diff --git a/transforms/__testfixtures__/class-access-default-props1.input.js b/transforms/__testfixtures__/class-access-default-props1.input.js
new file mode 100644
index 00000000..3518c8f9
--- /dev/null
+++ b/transforms/__testfixtures__/class-access-default-props1.input.js
@@ -0,0 +1,15 @@
+/* @flow */
+var React = require('react');
+var OtherClass = require('OtherClass');
+
+var NewThing = React.createClass({
+  getDefaultProps: OtherClass.getDefaultProps,
+  getData() {
+    return OtherClass.getDefaultProps();
+  },
+  render() {
+    return <div/>;
+  },
+});
+
+module.exports = NewThing;
diff --git a/transforms/__testfixtures__/class-access-default-props1.output.js b/transforms/__testfixtures__/class-access-default-props1.output.js
new file mode 100644
index 00000000..c33fc85c
--- /dev/null
+++ b/transforms/__testfixtures__/class-access-default-props1.output.js
@@ -0,0 +1,17 @@
+/* @flow */
+var React = require('react');
+var OtherClass = require('OtherClass');
+
+class NewThing extends React.Component {
+  static defaultProps = OtherClass.defaultProps;
+
+  getData = () => {
+    return OtherClass.defaultProps;
+  };
+
+  render() {
+    return <div/>;
+  }
+}
+
+module.exports = NewThing;
diff --git a/transforms/__testfixtures__/class-anonymous.input.js b/transforms/__testfixtures__/class-anonymous.input.js
new file mode 100644
index 00000000..22b4ca7b
--- /dev/null
+++ b/transforms/__testfixtures__/class-anonymous.input.js
@@ -0,0 +1,21 @@
+var React = require('react');
+
+const wrapper = (x) => x;
+
+const Foo = wrapper(React.createClass({
+  render() {
+    return <div>wow so anonymous</div>;
+  },
+}));
+
+module.exports = wrapper(React.createClass({
+  render() {
+    return <div>wow so anonymous</div>;
+  },
+}));
+
+export default wrapper(React.createClass({
+  render() {
+    return <div>wow so anonymous</div>;
+  },
+}));
diff --git a/transforms/__testfixtures__/class-anonymous.output.js b/transforms/__testfixtures__/class-anonymous.output.js
new file mode 100644
index 00000000..c90ecbc4
--- /dev/null
+++ b/transforms/__testfixtures__/class-anonymous.output.js
@@ -0,0 +1,21 @@
+var React = require('react');
+
+const wrapper = (x) => x;
+
+const Foo = wrapper(class extends React.Component {
+  render() {
+    return <div>wow so anonymous</div>;
+  }
+});
+
+module.exports = wrapper(class extends React.Component {
+  render() {
+    return <div>wow so anonymous</div>;
+  }
+});
+
+export default wrapper(class extends React.Component {
+  render() {
+    return <div>wow so anonymous</div>;
+  }
+});
diff --git a/transforms/__testfixtures__/class-anonymous2.input.js b/transforms/__testfixtures__/class-anonymous2.input.js
new file mode 100644
index 00000000..a9024745
--- /dev/null
+++ b/transforms/__testfixtures__/class-anonymous2.input.js
@@ -0,0 +1,50 @@
+/**
+ * @flow
+ */
+/* eslint-disable no-use-before-define */
+'use strict';
+
+var React = require('React');
+
+var CrazyObject = {
+  foo: {
+    bar: 123,
+  },
+  method: {
+    wrapThisGuy: (x) => x,
+    deep: {
+      wrapThatGuy: (x) => x,
+    },
+  },
+  iDontUnderstand: {
+    whyYouDoThis: {
+      butAnyway: {
+        comp1: React.createClass({
+          render() {
+            return <div/>;
+          },
+        }),
+        comp2: CrazyObject.method.wrapThatGuy(React.createClass({
+          render() {
+            return <div/>;
+          },
+        })),
+        waitWhatArrayForReal: [React.createClass({
+          render() {
+            return <div/>;
+          },
+        }), [React.createClass({
+          render() {
+            return <p/>;
+          },
+        }), React.createClass({
+          render() {
+            return <span/>;
+          },
+        })]],
+      },
+    },
+  },
+};
+
+module.exports = WaltUtils;
diff --git a/transforms/__testfixtures__/class-anonymous2.output.js b/transforms/__testfixtures__/class-anonymous2.output.js
new file mode 100644
index 00000000..1b7a8fcb
--- /dev/null
+++ b/transforms/__testfixtures__/class-anonymous2.output.js
@@ -0,0 +1,50 @@
+/**
+ * @flow
+ */
+/* eslint-disable no-use-before-define */
+'use strict';
+
+var React = require('React');
+
+var CrazyObject = {
+  foo: {
+    bar: 123,
+  },
+  method: {
+    wrapThisGuy: (x) => x,
+    deep: {
+      wrapThatGuy: (x) => x,
+    },
+  },
+  iDontUnderstand: {
+    whyYouDoThis: {
+      butAnyway: {
+        comp1: class extends React.Component {
+          render() {
+            return <div/>;
+          }
+        },
+        comp2: CrazyObject.method.wrapThatGuy(class extends React.Component {
+          render() {
+            return <div/>;
+          }
+        }),
+        waitWhatArrayForReal: [class extends React.Component {
+          render() {
+            return <div/>;
+          }
+        }, [class extends React.Component {
+          render() {
+            return <p/>;
+          }
+        }, class extends React.Component {
+          render() {
+            return <span/>;
+          }
+        }]],
+      },
+    },
+  },
+};
+
+module.exports = WaltUtils;
diff --git a/transforms/__testfixtures__/class-flow1.input.js b/transforms/__testfixtures__/class-flow1.input.js
new file mode 100644
index 00000000..da855cb9
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow1.input.js
@@ -0,0 +1,40 @@
+/* @flow */
+
+var React = require('react');
+
+var Component = React.createClass({
+  propTypes: {
+    optionalArray: React.PropTypes.array,
+    optionalBool: React.PropTypes.bool,
+    optionalFunc: React.PropTypes.func,
+    optionalNumber: React.PropTypes.number,
+    optionalObject: React.PropTypes.object,
+    optionalString: React.PropTypes.string,
+    optionalNode: React.PropTypes.node,
+    optionalElement: React.PropTypes.element,
+    optionalMessage: React.PropTypes.instanceOf(Message),
+    optionalEnum: React.PropTypes.oneOf(['News', 'Photos', 1, true, null, undefined]),
+    optionalUnion: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.number,
+      React.PropTypes.instanceOf(Message),
+    ]),
+    optionalArrayOf: React.PropTypes.arrayOf(React.PropTypes.number),
+    optionalObjectOf: React.PropTypes.objectOf(React.PropTypes.number),
+    optionalObjectOfRequiredField: React.PropTypes.objectOf(React.PropTypes.number.isRequired),
+    requiredObjectOfRequiredField: React.PropTypes.objectOf(React.PropTypes.number.isRequired).isRequired,
+    requiredObjectOfOptionalField: React.PropTypes.objectOf(React.PropTypes.number).isRequired,
+    optionalObjectWithShape: React.PropTypes.shape({
+      color: React.PropTypes.string,
+      fontSize: React.PropTypes.number.isRequired,
+    }),
+    requiredFunc: React.PropTypes.func.isRequired,
+    requiredAny: React.PropTypes.any.isRequired,
+  },
+
+  render: function() {
+    return (
+      <div>type safety</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-flow1.output.js b/transforms/__testfixtures__/class-flow1.output.js
new file mode 100644
index 00000000..7e506225
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow1.output.js
@@ -0,0 +1,65 @@
+/* @flow */
+
+var React = require('react');
+
+class Component extends React.Component {
+  props: {
+    optionalArray?: Array<$FlowFixMe>,
+    optionalBool?: boolean,
+    optionalFunc?: Function,
+    optionalNumber?: number,
+    optionalObject?: Object,
+    optionalString?: string,
+    optionalNode?: $FlowFixMe,
+    optionalElement?: $FlowFixMe,
+    optionalMessage?: Message,
+    optionalEnum?: 'News' | 'Photos' | 1 | true | null | void,
+    optionalUnion?: string | number | Message,
+    optionalArrayOf?: Array<number>,
+    optionalObjectOf?: {[key: string]: number},
+    optionalObjectOfRequiredField?: {[key: string]: number},
+    requiredObjectOfRequiredField: {[key: string]: number},
+    requiredObjectOfOptionalField: {[key: string]: number},
+    optionalObjectWithShape?: {
+      color?: string,
+      fontSize: number,
+    },
+    requiredFunc: Function,
+    requiredAny: any,
+  };
+
+  static propTypes = {
+    optionalArray: React.PropTypes.array,
+    optionalBool: React.PropTypes.bool,
+    optionalFunc: React.PropTypes.func,
+    optionalNumber: React.PropTypes.number,
+    optionalObject: React.PropTypes.object,
+    optionalString: React.PropTypes.string,
+    optionalNode: React.PropTypes.node,
+    optionalElement: React.PropTypes.element,
+    optionalMessage: React.PropTypes.instanceOf(Message),
+    optionalEnum: React.PropTypes.oneOf(['News', 'Photos', 1, true, null, undefined]),
+    optionalUnion: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.number,
+      React.PropTypes.instanceOf(Message),
+    ]),
+    optionalArrayOf: React.PropTypes.arrayOf(React.PropTypes.number),
+    optionalObjectOf: React.PropTypes.objectOf(React.PropTypes.number),
+    optionalObjectOfRequiredField: React.PropTypes.objectOf(React.PropTypes.number.isRequired),
+    requiredObjectOfRequiredField: React.PropTypes.objectOf(React.PropTypes.number.isRequired).isRequired,
+    requiredObjectOfOptionalField: React.PropTypes.objectOf(React.PropTypes.number).isRequired,
+    optionalObjectWithShape: React.PropTypes.shape({
+      color: React.PropTypes.string,
+      fontSize: React.PropTypes.number.isRequired,
+    }),
+    requiredFunc: React.PropTypes.func.isRequired,
+    requiredAny: React.PropTypes.any.isRequired,
+  };
+
+  render() {
+    return (
+      <div>type safety</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-flow2.input.js b/transforms/__testfixtures__/class-flow2.input.js
new file mode 100644
index 00000000..490706c6
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow2.input.js
@@ -0,0 +1,52 @@
+/* code taken from https://github.com/reactjs/react-router/blob/master/modules/IndexRoute.js */
+/* @flow */
+
+import React from 'react'
+import warning from './routerWarning'
+import invariant from 'invariant'
+import { createRouteFromReactElement } from './RouteUtils'
+import { component, components, falsy } from './InternalPropTypes'
+
+const { func } = React.PropTypes
+
+/**
+ * An <IndexRoute> is used to specify its parent's <Route indexRoute> in
+ * a JSX route config.
+ */
+const IndexRoute = React.createClass({
+
+  statics: {
+
+    createRouteFromReactElement(element, parentRoute) {
+      /* istanbul ignore else: sanity check */
+      if (parentRoute) {
+        parentRoute.indexRoute = createRouteFromReactElement(element)
+      } else {
+        warning(
+          false,
+          'An <IndexRoute> does not make sense at the root of your route config'
+        )
+      }
+    }
+
+  },
+
+  propTypes: {
+    path: falsy,
+    component,
+    components,
+    getComponent: func,
+    getComponents: func
+  },
+
+  /* istanbul ignore next: sanity check */
+  render() {
+    invariant(
+      false,
+      '<IndexRoute> elements are for router configuration only and should not be rendered'
+    )
+  }
+
+})
+
+export default IndexRoute
diff --git a/transforms/__testfixtures__/class-flow2.output.js b/transforms/__testfixtures__/class-flow2.output.js
new file mode 100644
index 00000000..3a6b74d5
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow2.output.js
@@ -0,0 +1,54 @@
+/* code taken from https://github.com/reactjs/react-router/blob/master/modules/IndexRoute.js */
+/* @flow */
+
+import React from 'react'
+import warning from './routerWarning'
+import invariant from 'invariant'
+import { createRouteFromReactElement } from './RouteUtils'
+import { component, components, falsy } from './InternalPropTypes'
+
+const { func } = React.PropTypes
+
+/**
+ * An <IndexRoute> is used to specify its parent's <Route indexRoute> in
+ * a JSX route config.
+ */
+class IndexRoute extends React.Component {
+  props: {
+    path?: $FlowFixMe,
+    component?: $FlowFixMe,
+    components?: $FlowFixMe,
+    getComponent?: $FlowFixMe,
+    getComponents?: $FlowFixMe,
+  };
+
+  static createRouteFromReactElement(element, parentRoute) {
+    /* istanbul ignore else: sanity check */
+    if (parentRoute) {
+      parentRoute.indexRoute = createRouteFromReactElement(element)
+    } else {
+      warning(
+        false,
+        'An <IndexRoute> does not make sense at the root of your route config'
+      )
+    }
+  }
+
+  static propTypes = {
+    path: falsy,
+    component,
+    components,
+    getComponent: func,
+    getComponents: func
+  };
+
+  /* istanbul ignore next: sanity check */
+  render() {
+    invariant(
+      false,
+      '<IndexRoute> elements are for router configuration only and should not be rendered'
+    )
+  }
+}
+
+export default IndexRoute
diff --git a/transforms/__testfixtures__/class-flow3.input.js b/transforms/__testfixtures__/class-flow3.input.js
new file mode 100644
index 00000000..f42dfd44
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow3.input.js
@@ -0,0 +1,47 @@
+/* @flow */
+
+var React = require('react');
+var {PropTypes} = React;
+
+var getPropTypes = () => PropTypes.string;
+
+var myUnionPropType = PropTypes.oneOfType([
+  PropTypes.string,
+  PropTypes.number,
+  PropTypes.instanceOf(Message),
+]);
+
+var spreadMe = {
+  optionalArray: PropTypes.array,
+  optionalBool: PropTypes.bool,
+};
+
+var optionalFuncShortHand = PropTypes.func;
+
+var Component = React.createClass({
+  propTypes: {
+    ...spreadMe,
+    optionalFuncShortHand,
+    optionalNumber: 1 + 1 === 2 ? PropTypes.number : PropTypes.string,
+    optionalObject: PropTypes.object,
+    optionalString: getPropTypes(),
+    optionalNode: PropTypes.node,
+    optionalElement: PropTypes.element,
+    optionalMessage: PropTypes.instanceOf(Message),
+    optionalEnum: PropTypes.oneOf(['News', 'Photos', 1, true, null]),
+    optionalUnion: myUnionPropType,
+    optionalArrayOf: PropTypes.arrayOf(PropTypes.number),
+    optionalObjectOf: PropTypes.objectOf(PropTypes.number),
+    optionalObjectWithShape: PropTypes.shape({
+      color: PropTypes.string,
+    }),
+    requiredFunc: PropTypes.func.isRequired,
+    requiredAny: PropTypes.any.isRequired,
+  },
+
+  render: function() {
+    return (
+      <div>type safety</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-flow3.output.js b/transforms/__testfixtures__/class-flow3.output.js
new file mode 100644
index 00000000..932b2337
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow3.output.js
@@ -0,0 +1,64 @@
+/* @flow */
+
+var React = require('react');
+var {PropTypes} = React;
+
+var getPropTypes = () => PropTypes.string;
+
+var myUnionPropType = PropTypes.oneOfType([
+  PropTypes.string,
+  PropTypes.number,
+  PropTypes.instanceOf(Message),
+]);
+
+var spreadMe = {
+  optionalArray: PropTypes.array,
+  optionalBool: PropTypes.bool,
+};
+
+var optionalFuncShortHand = PropTypes.func;
+
+class Component extends React.Component {
+  props: {
+    optionalFuncShortHand?: $FlowFixMe,
+    optionalNumber?: $FlowFixMe,
+    optionalObject?: Object,
+    optionalString?: $FlowFixMe,
+    optionalNode?: $FlowFixMe,
+    optionalElement?: $FlowFixMe,
+    optionalMessage?: Message,
+    optionalEnum?: 'News' | 'Photos' | 1 | true | null,
+    optionalUnion?: $FlowFixMe,
+    optionalArrayOf?: Array<number>,
+    optionalObjectOf?: {[key: string]: number},
+    optionalObjectWithShape?: {color?: string},
+    requiredFunc: Function,
+    requiredAny: any,
+  };
+
+  static propTypes = {
+    ...spreadMe,
+    optionalFuncShortHand,
+    optionalNumber: 1 + 1 === 2 ? PropTypes.number : PropTypes.string,
+    optionalObject: PropTypes.object,
+    optionalString: getPropTypes(),
+    optionalNode: PropTypes.node,
+    optionalElement: PropTypes.element,
+    optionalMessage: PropTypes.instanceOf(Message),
+    optionalEnum: PropTypes.oneOf(['News', 'Photos', 1, true, null]),
+    optionalUnion: myUnionPropType,
+    optionalArrayOf: PropTypes.arrayOf(PropTypes.number),
+    optionalObjectOf: PropTypes.objectOf(PropTypes.number),
+    optionalObjectWithShape: PropTypes.shape({
+      color: PropTypes.string,
+    }),
+    requiredFunc: PropTypes.func.isRequired,
+    requiredAny: PropTypes.any.isRequired,
+  };
+
+  render() {
+    return (
+      <div>type safety</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-flow4.input.js b/transforms/__testfixtures__/class-flow4.input.js
new file mode 100644
index 00000000..9694eb60
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow4.input.js
@@ -0,0 +1,44 @@
+/* @flow */
+
+var React = require('react');
+var {PropTypes} = React;
+
+var myUnionPropType = PropTypes.oneOfType([
+  PropTypes.string,
+  PropTypes.number,
+  PropTypes.instanceOf(Message),
+]);
+
+var spreadMe = {
+  optionalArray: PropTypes.array,
+  optionalBool: PropTypes.bool,
+};
+
+var optionalFuncShortHand = PropTypes.func;
+
+var Component = React.createClass({
+  propTypes: Object.assign({}, {
+    ...spreadMe,
+    optionalFuncShortHand,
+    optionalNumber: PropTypes.number,
+    optionalObject: PropTypes.object,
+  }),
+
+  render: function() {
+    return (
+      <div>type safety</div>
+    );
+  },
+});
+
+var thatPropTypes = {};
+
+var Component2 = React.createClass({
+  propTypes: thatPropTypes,
+
+  render: function() {
+    return (
+      <div>type safety</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-flow4.output.js b/transforms/__testfixtures__/class-flow4.output.js
new file mode 100644
index 00000000..a25c6254
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow4.output.js
@@ -0,0 +1,44 @@
+/* @flow */
+
+var React = require('react');
+var {PropTypes} = React;
+
+var myUnionPropType = PropTypes.oneOfType([
+  PropTypes.string,
+  PropTypes.number,
+  PropTypes.instanceOf(Message),
+]);
+
+var spreadMe = {
+  optionalArray: PropTypes.array,
+  optionalBool: PropTypes.bool,
+};
+
+var optionalFuncShortHand = PropTypes.func;
+
+class Component extends React.Component {
+  static propTypes = Object.assign({}, {
+    ...spreadMe,
+    optionalFuncShortHand,
+    optionalNumber: PropTypes.number,
+    optionalObject: PropTypes.object,
+  });
+
+  render() {
+    return (
+      <div>type safety</div>
+    );
+  }
+}
+
+var thatPropTypes = {};
+
+class Component2 extends React.Component {
+  static propTypes = thatPropTypes;
+
+  render() {
+    return (
+      <div>type safety</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-flow5.input.js b/transforms/__testfixtures__/class-flow5.input.js
new file mode 100644
index 00000000..3abae359
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow5.input.js
@@ -0,0 +1,40 @@
+/* @flow */
+
+var React = require('react');
+
+type SomeStuff<A> = { // TypeParameter
+  fetch: () => Promise<A>,
+};
+
+var Component = React.createClass({
+  statics: {
+    notTyped: true,
+    nothing: (null: null), // NullTypeAnnotation
+    numberOrBool: (true: number | boolean),
+    logger: (x: any): void => { console.log(x); },
+    logger2: function(x: any): void {
+      console.log(x);
+    },
+  },
+
+  notTyped: true,
+  foo: (12: number),
+  bar: ('2000': string),
+  handleClick: (null: ?(evt: any) => void),
+
+  doStuff: function(x: number, y: boolean): boolean {
+    return y && (x > 0);
+  },
+
+  componentDidMount: function() {
+    this.handleClick = function(e) {
+      console.log(e);
+    };
+  },
+
+  render: function() {
+    return (
+      <div onClick={this.handleClick}>{this.foo}</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-flow5.output.js b/transforms/__testfixtures__/class-flow5.output.js
new file mode 100644
index 00000000..ca001120
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow5.output.js
@@ -0,0 +1,39 @@
+/* @flow */
+
+var React = require('react');
+
+type SomeStuff<A> = { // TypeParameter
+  fetch: () => Promise<A>,
+};
+
+class Component extends React.Component {
+  static notTyped = true;
+  static nothing: null = null; // NullTypeAnnotation
+  static numberOrBool: number | boolean = true;
+  static logger = (x: any): void => { console.log(x); };
+
+  static logger2(x: any): void {
+    console.log(x);
+  }
+
+  notTyped = true;
+  foo: number = 12;
+  bar: string = '2000';
+  handleClick: ?(evt: any) => void = null;
+
+  doStuff = (x: number, y: boolean): boolean => {
+    return y && (x > 0);
+  };
+
+  componentDidMount() {
+    this.handleClick = function(e) {
+      console.log(e);
+    };
+  }
+
+  render() {
+    return (
+      <div onClick={this.handleClick}>{this.foo}</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-flow6.input.js b/transforms/__testfixtures__/class-flow6.input.js
new file mode 100644
index 00000000..b008f814
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow6.input.js
@@ -0,0 +1,41 @@
+/* @flow */
+
+var React = require('react');
+
+const justNeedKeys = {
+  a: 12,
+  b: 23,
+};
+
+var Component = React.createClass({
+  propTypes: {
+    optionalMessage: React.PropTypes.instanceOf(Message),
+    optionalMessageOops: React.PropTypes.instanceOf(foo()),
+    optionalEnum: React.PropTypes.oneOf(Object.keys(justNeedKeys)),
+    optionalEnumOops: React.PropTypes.oneOf(bar),
+    optionalUnion: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.number,
+      React.PropTypes.instanceOf(Message),
+    ]),
+    optionalUnionOops: React.PropTypes.oneOfType(foo()),
+    optionalUnionOops2: React.PropTypes.oneOfType(Bar),
+    optionalArrayOf: React.PropTypes.arrayOf(React.PropTypes.number),
+    optionalObjectOf: React.PropTypes.objectOf(React.PropTypes.number),
+    optionalObjectWithShape: React.PropTypes.shape({
+      color: React.PropTypes.string,
+      fontSize: foo,
+      name: bla(),
+    }),
+    optionalObjectWithShapeOops: React.PropTypes.shape(foo()),
+    optionalObjectWithShapeOops2: React.PropTypes.shape(bla),
+    'is-literal-cool': React.PropTypes.bool,
+    'well-fine': React.PropTypes.number.isRequired,
+  },
+
+  render: function() {
+    return (
+      <div>type safety</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-flow6.output.js b/transforms/__testfixtures__/class-flow6.output.js
new file mode 100644
index 00000000..1ac3ff07
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow6.output.js
@@ -0,0 +1,62 @@
+/* @flow */
+
+var React = require('react');
+
+const justNeedKeys = {
+  a: 12,
+  b: 23,
+};
+
+class Component extends React.Component {
+  props: {
+    optionalMessage?: Message,
+    optionalMessageOops?: $FlowFixMe,
+    optionalEnum?: $FlowFixMe,
+    optionalEnumOops?: $FlowFixMe,
+    optionalUnion?: string | number | Message,
+    optionalUnionOops?: $FlowFixMe,
+    optionalUnionOops2?: $FlowFixMe,
+    optionalArrayOf?: Array<number>,
+    optionalObjectOf?: {[key: string]: number},
+    optionalObjectWithShape?: {
+      color?: string,
+      fontSize?: $FlowFixMe,
+      name?: $FlowFixMe,
+    },
+    optionalObjectWithShapeOops?: $FlowFixMe,
+    optionalObjectWithShapeOops2?: $FlowFixMe,
+    'is-literal-cool'?: boolean,
+    'well-fine': number,
+  };
+
+  static propTypes = {
+    optionalMessage: React.PropTypes.instanceOf(Message),
+    optionalMessageOops: React.PropTypes.instanceOf(foo()),
+    optionalEnum: React.PropTypes.oneOf(Object.keys(justNeedKeys)),
+    optionalEnumOops: React.PropTypes.oneOf(bar),
+    optionalUnion: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.number,
+      React.PropTypes.instanceOf(Message),
+    ]),
+    optionalUnionOops: React.PropTypes.oneOfType(foo()),
+    optionalUnionOops2: React.PropTypes.oneOfType(Bar),
+    optionalArrayOf: React.PropTypes.arrayOf(React.PropTypes.number),
+    optionalObjectOf: React.PropTypes.objectOf(React.PropTypes.number),
+    optionalObjectWithShape: React.PropTypes.shape({
+      color: React.PropTypes.string,
+      fontSize: foo,
+      name: bla(),
+    }),
+    optionalObjectWithShapeOops: React.PropTypes.shape(foo()),
+    optionalObjectWithShapeOops2: React.PropTypes.shape(bla),
+    'is-literal-cool': React.PropTypes.bool,
+    'well-fine': React.PropTypes.number.isRequired,
+  };
+
+  render() {
+    return (
+      <div>type safety</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-flow7.input.js b/transforms/__testfixtures__/class-flow7.input.js
new file mode 100644
index 00000000..b008f814
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow7.input.js
@@ -0,0 +1,41 @@
+/* @flow */
+
+var React = require('react');
+
+const justNeedKeys = {
+  a: 12,
+  b: 23,
+};
+
+var Component = React.createClass({
+  propTypes: {
+    optionalMessage: React.PropTypes.instanceOf(Message),
+    optionalMessageOops: React.PropTypes.instanceOf(foo()),
+    optionalEnum: React.PropTypes.oneOf(Object.keys(justNeedKeys)),
+    optionalEnumOops: React.PropTypes.oneOf(bar),
+    optionalUnion: React.PropTypes.oneOfType([
+      React.PropTypes.string,
+      React.PropTypes.number,
+      React.PropTypes.instanceOf(Message),
+    ]),
+    optionalUnionOops: React.PropTypes.oneOfType(foo()),
+    optionalUnionOops2: React.PropTypes.oneOfType(Bar),
+    optionalArrayOf: React.PropTypes.arrayOf(React.PropTypes.number),
+    optionalObjectOf: React.PropTypes.objectOf(React.PropTypes.number),
+    optionalObjectWithShape: React.PropTypes.shape({
+      color: React.PropTypes.string,
+      fontSize: foo,
+      name: bla(),
+    }),
+    optionalObjectWithShapeOops: React.PropTypes.shape(foo()),
+    optionalObjectWithShapeOops2: React.PropTypes.shape(bla),
+    'is-literal-cool': React.PropTypes.bool,
+    'well-fine': React.PropTypes.number.isRequired,
+  },
+
+  render: function() {
+    return (
+      <div>type safety</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-flow7.output.js b/transforms/__testfixtures__/class-flow7.output.js
new file mode 100644
index 00000000..a30533bc
--- /dev/null
+++ b/transforms/__testfixtures__/class-flow7.output.js
@@ -0,0 +1,37 @@
+/* @flow */
+
+var React = require('react');
+
+const justNeedKeys = {
+  a: 12,
+  b: 23,
+};
+
+class Component extends React.Component {
+  props: {
+    optionalMessage?: Message,
+    optionalMessageOops?: $FlowFixMe,
+    optionalEnum?: $FlowFixMe,
+    optionalEnumOops?: $FlowFixMe,
+    optionalUnion?: string | number | Message,
+    optionalUnionOops?: $FlowFixMe,
+    optionalUnionOops2?: $FlowFixMe,
+    optionalArrayOf?: Array<number>,
+    optionalObjectOf?: {[key: string]: number},
+    optionalObjectWithShape?: {
+      color?: string,
+      fontSize?: $FlowFixMe,
+      name?: $FlowFixMe,
+    },
+    optionalObjectWithShapeOops?: $FlowFixMe,
+    optionalObjectWithShapeOops2?: $FlowFixMe,
+    'is-literal-cool'?: boolean,
+    'well-fine': number,
+  };
+
+  render() {
+    return (
+      <div>type safety</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-initial-state.input.js b/transforms/__testfixtures__/class-initial-state.input.js
new file mode 100644
index 00000000..b5ecfdaf
--- /dev/null
+++ b/transforms/__testfixtures__/class-initial-state.input.js
@@ -0,0 +1,309 @@
+/* @flow */
+
+import React from 'React';
+
+type SomeState = {foo: string};
+
+// only needs props
+var MyComponent = React.createClass({
+  getInitialState: function(): {heyoo: number} {
+    var x = this.props.foo;
+    return {
+      heyoo: 23,
+    };
+  },
+
+  foo: function(): void {
+    this.setState({heyoo: 24});
+  },
+});
+
+var ComponentWithBothPropsAndContextAccess = React.createClass({
+  contextTypes: {
+    name: React.PropTypes.string,
+  },
+
+  // we actually don't need a constructor here since this will be
+  // initialized after a proper super(props, context) call.
+  // in other words, `this` will be ready when it reaches here.
+  getInitialState: function() {
+    return {
+      foo: this.props.foo,
+      bar: this.context.bar,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.context.name}</div>
+    );
+  },
+});
+
+const App = React.createClass({
+  getInitialState(): SomeState {
+    const state = this.calculateState(); // _might_ use `this.context`
+    return state;
+  },
+  calculateState() {
+    return { color: this.context.color };
+  },
+  render() {
+    return <div />;
+  },
+});
+
+const App2 = React.createClass({
+  getInitialState() {
+    const state = {
+      whatever: this.context.whatever, // needs context
+    };
+    return state;
+  },
+  render() {
+    return <div />;
+  },
+});
+
+App.contextTypes = {
+  whatever: React.PropTypes.object,
+};
+
+var MyComponent2 = React.createClass({
+  getInitialState: function() {
+    var x = this.props.foo.bar.wow.so.deep;
+    return {
+      heyoo: 23,
+    };
+  },
+
+  foo: function(): void {
+    this.setState({heyoo: 24});
+  },
+});
+
+const getContextFromInstance = (x) => x.context; // meh
+
+var MyComponent3 = React.createClass({
+  getInitialState: function() {
+    var x = getContextFromInstance(this); // `this` is referenced alone
+    return {
+      heyoo: x,
+    };
+  },
+
+  foo: function(): void {
+    this.setState({heyoo: 24});
+  },
+});
+
+// we are not sure what you'll need from `this`,
+// so it's safe to defer `state`'s initialization
+var MyComponent4 = React.createClass({
+  getInitialState: function() {
+    return {
+      heyoo: getContextFromInstance(this),
+    };
+  },
+
+  foo: function(): void {
+    this.setState({heyoo: 24});
+  },
+});
+
+// but only accessing `this.props` and/or `this.context` is safe
+var MyComponent5 = React.createClass({
+  getInitialState: function() {
+    return {
+      heyoo: getContextFromInstance(this.props),
+    };
+  },
+
+  foo: function(): void {
+    this.setState({heyoo: 24});
+  },
+});
+
+// intense control flow testing
+var Loader = React.createClass({
+  getInitialState() {
+    if (this.props.stuff) {
+      return {x: 1};
+    } else if (this.props.thing) {
+      return {x: 2};
+    }
+    switch (this.props.wow) {
+      case 1:
+        return this.props.lol ?
+          {x: 3} :
+          this.whatever(this.props);
+    }
+    for (let i = 0; i < 100; i++) {
+      if (i === 20) {
+        return {x: i};
+      }
+    }
+
+    try {
+      doSomeThingReallyBad();
+    } catch (e) {
+      return {error: e};
+    }
+
+    return this.lol();
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var FunctionDeclarationInGetInitialState = React.createClass({
+  getInitialState() {
+    function func() {
+      var x = 1;
+      return x; // dont change me
+    }
+
+    const foo = () => {
+      return 120; // dont change me
+    };
+
+    var q = function() {
+      return 100; // dont change me
+    };
+
+    return {
+      x: func(),
+      y: foo(),
+      z: q(),
+    };
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var DeferStateInitialization = React.createClass({
+  getInitialState() {
+    return {x: this.something};
+  },
+
+  something: 42,
+
+  render() {
+    return <div onClick={this.reset} />;
+  },
+});
+
+var helper = () => {};
+
+var PassGetInitialState = React.createClass({ // bail out here
+  getInitialState() {
+    return this.lol();
+  },
+
+  helper1: function() {
+    helper(this.getInitialState);
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var UseGetInitialState = React.createClass({ // bail out here
+  getInitialState() {
+    return this.lol();
+  },
+
+  helper2() {
+    this.setState(this.getInitialState());
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var UseArguments = React.createClass({ // bail out here
+  helper() {
+    console.log(arguments);
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var ShadowingIssue = React.createClass({ // bail out here
+  getInitialState() {
+    const props = { x: 123 };
+    return { x: props.x };
+  },
+
+  render() {
+    return null;
+  },
+});
+
+// will remove unnecessary bindings
+var ShadowingButFine = React.createClass({
+  getInitialState() {
+    const props = this.props;
+    const context = this.context;
+    return { x: props.x + context.x };
+  },
+
+  render() {
+    return null;
+  },
+});
+
+// move type annotations
+var WithSimpleType = React.createClass({
+  getInitialState(): Object {
+    return {
+      x: 12,
+      y: 13,
+      z: 14,
+    };
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var WithLongType = React.createClass({
+  getInitialState(): {name: string, age: number, counter: number} {
+    return {
+      name: 'Michael',
+      age: 23,
+      count: 6,
+    };
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var WithMultiLineType = React.createClass({
+  getInitialState(): {
+    nameLists: Array<Array<string>>,
+    age?: ?number,
+    counter?: ?number,
+  } {
+    return {
+      nameLists: [['James']],
+      count: 1400,
+      foo: 'bar',
+    };
+  },
+
+  render() {
+    return null;
+  },
+});
diff --git a/transforms/__testfixtures__/class-initial-state.output.js b/transforms/__testfixtures__/class-initial-state.output.js
new file mode 100644
index 00000000..e71740c0
--- /dev/null
+++ b/transforms/__testfixtures__/class-initial-state.output.js
@@ -0,0 +1,328 @@
+/* @flow */
+
+import React from 'React';
+
+type SomeState = {foo: string};
+
+// only needs props
+class MyComponent extends React.Component {
+  state: {heyoo: number};
+
+  constructor(props) {
+    super(props);
+    var x = props.foo;
+
+    this.state = {
+      heyoo: 23,
+    };
+  }
+
+  foo = (): void => {
+    this.setState({heyoo: 24});
+  };
+}
+
+class ComponentWithBothPropsAndContextAccess extends React.Component {
+  static contextTypes = {
+    name: React.PropTypes.string,
+  };
+
+  // we actually don't need a constructor here since this will be
+  // initialized after a proper super(props, context) call.
+  // in other words, `this` will be ready when it reaches here.
+  state = {
+    foo: this.props.foo,
+    bar: this.context.bar,
+  };
+
+  render() {
+    return (
+      <div>{this.context.name}</div>
+    );
+  }
+}
+
+class App extends React.Component {
+  state: SomeState;
+
+  constructor(props, context) {
+    super(props, context);
+    const state = this.calculateState(); // _might_ use `this.context`
+    this.state = state;
+  }
+
+  calculateState = () => {
+    return { color: this.context.color };
+  };
+
+  render() {
+    return <div />;
+  }
+}
+
+class App2 extends React.Component {
+  state: Object;
+
+  constructor(props, context) {
+    super(props, context);
+    const state = {
+      whatever: context.whatever, // needs context
+    };
+    this.state = state;
+  }
+
+  render() {
+    return <div />;
+  }
+}
+
+App.contextTypes = {
+  whatever: React.PropTypes.object,
+};
+
+class MyComponent2 extends React.Component {
+  state: Object;
+
+  constructor(props) {
+    super(props);
+    var x = props.foo.bar.wow.so.deep;
+
+    this.state = {
+      heyoo: 23,
+    };
+  }
+
+  foo = (): void => {
+    this.setState({heyoo: 24});
+  };
+}
+
+const getContextFromInstance = (x) => x.context; // meh
+
+class MyComponent3 extends React.Component {
+  state: Object;
+
+  constructor(props, context) {
+    super(props, context);
+    var x = getContextFromInstance(this); // `this` is referenced alone
+
+    this.state = {
+      heyoo: x,
+    };
+  }
+
+  foo = (): void => {
+    this.setState({heyoo: 24});
+  };
+}
+
+// we are not sure what you'll need from `this`,
+// so it's safe to defer `state`'s initialization
+class MyComponent4 extends React.Component {
+  foo = (): void => {
+    this.setState({heyoo: 24});
+  };
+
+  state = {
+    heyoo: getContextFromInstance(this),
+  };
+}
+
+// but only accessing `this.props` and/or `this.context` is safe
+class MyComponent5 extends React.Component {
+  state = {
+    heyoo: getContextFromInstance(this.props),
+  };
+
+  foo = (): void => {
+    this.setState({heyoo: 24});
+  };
+}
+
+// intense control flow testing
+class Loader extends React.Component {
+  state: Object;
+
+  constructor(props, context) {
+    super(props, context);
+    if (props.stuff) {
+      this.state = {x: 1};
+      return;
+    } else if (props.thing) {
+      this.state = {x: 2};
+      return;
+    }
+    switch (props.wow) {
+      case 1:
+        this.state = props.lol ?
+          {x: 3} :
+          this.whatever(props);
+
+        return;
+    }
+    for (let i = 0; i < 100; i++) {
+      if (i === 20) {
+        this.state = {x: i};
+        return;
+      }
+    }
+
+    try {
+      doSomeThingReallyBad();
+    } catch (e) {
+      this.state = {error: e};
+      return;
+    }
+
+    this.state = this.lol();
+  }
+
+  render() {
+    return null;
+  }
+}
+
+class FunctionDeclarationInGetInitialState extends React.Component {
+  state: Object;
+
+  constructor(props) {
+    super(props);
+    function func() {
+      var x = 1;
+      return x; // dont change me
+    }
+
+    const foo = () => {
+      return 120; // dont change me
+    };
+
+    var q = function() {
+      return 100; // dont change me
+    };
+
+    this.state = {
+      x: func(),
+      y: foo(),
+      z: q(),
+    };
+  }
+
+  render() {
+    return null;
+  }
+}
+
+class DeferStateInitialization extends React.Component {
+  something = 42;
+  state = {x: this.something};
+
+  render() {
+    return <div onClick={this.reset} />;
+  }
+}
+
+var helper = () => {};
+
+var PassGetInitialState = React.createClass({ // bail out here
+  getInitialState() {
+    return this.lol();
+  },
+
+  helper1: function() {
+    helper(this.getInitialState);
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var UseGetInitialState = React.createClass({ // bail out here
+  getInitialState() {
+    return this.lol();
+  },
+
+  helper2() {
+    this.setState(this.getInitialState());
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var UseArguments = React.createClass({ // bail out here
+  helper() {
+    console.log(arguments);
+  },
+
+  render() {
+    return null;
+  },
+});
+
+var ShadowingIssue = React.createClass({ // bail out here
+  getInitialState() {
+    const props = { x: 123 };
+    return { x: props.x };
+  },
+
+  render() {
+    return null;
+  },
+});
+
+// will remove unnecessary bindings
+class ShadowingButFine extends React.Component {
+  state: Object;
+
+  constructor(props, context) {
+    super(props, context);
+    this.state = { x: props.x + context.x };
+  }
+
+  render() {
+    return null;
+  }
+}
+
+// move type annotations
+class WithSimpleType extends React.Component {
+  state: Object = {
+    x: 12,
+    y: 13,
+    z: 14,
+  };
+
+  render() {
+    return null;
+  }
+}
+
+class WithLongType extends React.Component {
+  state: {name: string, age: number, counter: number} = {
+    name: 'Michael',
+    age: 23,
+    count: 6,
+  };
+
+  render() {
+    return null;
+  }
+}
+
+class WithMultiLineType extends React.Component {
+  state: {
+    nameLists: Array<Array<string>>,
+    age?: ?number,
+    counter?: ?number,
+  } = {
+    nameLists: [['James']],
+    count: 1400,
+    foo: 'bar',
+  };
+
+  render() {
+    return null;
+  }
+}
diff --git a/transforms/__testfixtures__/class-property-field.input.js b/transforms/__testfixtures__/class-property-field.input.js
new file mode 100644
index 00000000..e6ba4006
--- /dev/null
+++ b/transforms/__testfixtures__/class-property-field.input.js
@@ -0,0 +1,28 @@
+const React = require('react');
+
+const Component1 = React.createClass({
+  statics: {
+    booleanPrim: true,
+    numberPrim: 12,
+    stringPrim: 'foo',
+    nullPrim: null,
+    undefinedPrim: undefined,
+  },
+  booleanPrim: true,
+  numberPrim: 12,
+  stringPrim: 'foo',
+  nullPrim: null,
+  undefinedPrim: undefined,
+
+  foobar: function() {
+    return 123;
+  },
+
+  componentDidMount: function() {
+    console.log('hello');
+  },
+
+  render: function() {
+    return <div />;
+  },
+});
diff --git a/transforms/__testfixtures__/class-property-field.output.js b/transforms/__testfixtures__/class-property-field.output.js
new file mode 100644
index 00000000..34305a2b
--- /dev/null
+++ b/transforms/__testfixtures__/class-property-field.output.js
@@ -0,0 +1,26 @@
+const React = require('react');
+
+class Component1 extends React.Component {
+  static booleanPrim = true;
+  static numberPrim = 12;
+  static stringPrim = 'foo';
+  static nullPrim = null;
+  static undefinedPrim = undefined;
+  booleanPrim = true;
+  numberPrim = 12;
+  stringPrim = 'foo';
+  nullPrim = null;
+  undefinedPrim = undefined;
+
+  foobar = () => {
+    return 123;
+  };
+
+  componentDidMount() {
+    console.log('hello');
+  }
+
+  render() {
+    return <div />;
+  }
+}
diff --git a/transforms/__testfixtures__/class-pure-mixin1.input.js b/transforms/__testfixtures__/class-pure-mixin1.input.js
new file mode 100644
index 00000000..381a7e7f
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin1.input.js
@@ -0,0 +1,19 @@
+// dont remove me
+var ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
+var React = require('React');
+
+var ComponentWithOnlyPureRenderMixin = React.createClass({
+  mixins: [ReactComponentWithPureRenderMixin],
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-pure-mixin1.output.js b/transforms/__testfixtures__/class-pure-mixin1.output.js
new file mode 100644
index 00000000..741db3c9
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin1.output.js
@@ -0,0 +1,14 @@
+// dont remove me
+var React = require('React');
+
+class ComponentWithOnlyPureRenderMixin extends React.PureComponent {
+  state = {
+    counter: this.props.initialNumber + 1,
+  };
+
+  render() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-pure-mixin2.input.js b/transforms/__testfixtures__/class-pure-mixin2.input.js
new file mode 100644
index 00000000..02734881
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin2.input.js
@@ -0,0 +1,27 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule Bar
+ * @typechecks
+ * @flow
+ */
+import WhateverYouCallIt from 'react-addons-pure-render-mixin';
+import React from 'React';
+import dontPruneMe from 'foobar';
+
+var ComponentWithOnlyPureRenderMixin = React.createClass({
+  mixins: [WhateverYouCallIt],
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    dontPruneMe();
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-pure-mixin2.output.js b/transforms/__testfixtures__/class-pure-mixin2.output.js
new file mode 100644
index 00000000..91b13c6a
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin2.output.js
@@ -0,0 +1,22 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule Bar
+ * @typechecks
+ * @flow
+ */
+import React from 'React';
+import dontPruneMe from 'foobar';
+
+class ComponentWithOnlyPureRenderMixin extends React.PureComponent {
+  state = {
+    counter: this.props.initialNumber + 1,
+  };
+
+  render() {
+    dontPruneMe();
+    return (
+      <div>{this.state.counter}</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class-pure-mixin3.input.js b/transforms/__testfixtures__/class-pure-mixin3.input.js
new file mode 100644
index 00000000..32592bf2
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin3.input.js
@@ -0,0 +1,20 @@
+// for this file we disable the `pure-component` option
+// so the output should be just nothing
+var React = require('React');
+var ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
+
+var ComponentWithOnlyPureRenderMixin = React.createClass({
+  mixins: [ReactComponentWithPureRenderMixin],
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-pure-mixin3.output.js b/transforms/__testfixtures__/class-pure-mixin3.output.js
new file mode 100644
index 00000000..e69de29b
diff --git a/transforms/__testfixtures__/class-pure-mixin4.input.js b/transforms/__testfixtures__/class-pure-mixin4.input.js
new file mode 100644
index 00000000..6cc257c7
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin4.input.js
@@ -0,0 +1,34 @@
+/**
+ * Copyright 2004-present Facebook. All rights reserved.
+ *
+ * @providesModule HelloGuys
+ * @fbt {"foo": "bar"}
+ * @flow
+ * @typechecks
+ */
+
+'use strict';
+
+const React = require('React');
+const ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
+
+/**
+ * just a description here
+ */
+const HelloGuys = React.createClass({
+  mixins: [
+    ReactComponentWithPureRenderMixin,
+  ],
+
+  propTypes: {},
+
+  render(): ReactElement<any> {
+    return (
+      <div>
+        wassup
+      </div>
+    );
+  },
+});
+
+module.exports = HelloGuys;
diff --git a/transforms/__testfixtures__/class-pure-mixin4.output.js b/transforms/__testfixtures__/class-pure-mixin4.output.js
new file mode 100644
index 00000000..0bc2f737
--- /dev/null
+++ b/transforms/__testfixtures__/class-pure-mixin4.output.js
@@ -0,0 +1,30 @@
+/**
+ * Copyright 2004-present Facebook. All rights reserved.
+ *
+ * @providesModule HelloGuys
+ * @fbt {"foo": "bar"}
+ * @flow
+ * @typechecks
+ */
+
+'use strict';
+
+const React = require('React');
+
+/**
+ * just a description here
+ */
+class HelloGuys extends React.PureComponent {
+  props: {};
+  static propTypes = {};
+
+  render(): ReactElement<any> {
+    return (
+      <div>
+        wassup
+      </div>
+    );
+  }
+}
+
+module.exports = HelloGuys;
diff --git a/transforms/__testfixtures__/class-test2.input.js b/transforms/__testfixtures__/class-test2.input.js
new file mode 100644
index 00000000..ae54847f
--- /dev/null
+++ b/transforms/__testfixtures__/class-test2.input.js
@@ -0,0 +1,116 @@
+'use strict';
+
+var React = require('React');
+var ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
+var FooBarMixin = require('FooBarMixin');
+
+var ComponentWithNonSimpleInitialState = React.createClass({
+  statics: {
+    iDontKnowWhyYouNeedThis: true, // but comment it
+    foo: 'bar',
+    dontBindMe: function(count: number): any {
+      return this;
+    },
+  },
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
+
+// Comment
+module.exports = React.createClass({
+  propTypes: {
+    foo: React.PropTypes.bool,
+  },
+
+  getDefaultProps: function() {
+    return {
+      foo: 12,
+    };
+  },
+
+  getInitialState: function() { // non-simple getInitialState
+    var data = 'bar';
+    return {
+      bar: data,
+    };
+  },
+
+  render: function() {
+    return <div />;
+  },
+});
+
+var ComponentWithInconvertibleMixins = React.createClass({
+  mixins: [ReactComponentWithPureRenderMixin, FooBarMixin],
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
+
+var listOfInconvertibleMixins = [ReactComponentWithPureRenderMixin, FooBarMixin];
+
+var ComponentWithInconvertibleMixins2 = React.createClass({
+  mixins: listOfInconvertibleMixins,
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
+
+// taken from https://facebook.github.io/react/docs/context.html#updating-context
+var MediaQuery = React.createClass({
+  childContextTypes: {
+    type: React.PropTypes.string,
+  },
+
+  getInitialState: function() {
+    return {type:'desktop'};
+  },
+
+  getChildContext: function() {
+    return {type: this.state.type};
+  },
+
+  componentDidMount: function() {
+    const checkMediaQuery = () => {
+      const type = window.matchMedia('(min-width: 1025px)').matches ? 'desktop' : 'mobile';
+      if (type !== this.state.type) {
+        this.setState({type});
+      }
+    };
+
+    window.addEventListener('resize', checkMediaQuery);
+    checkMediaQuery();
+  },
+
+  render: function() {
+    return this.props.children;
+  },
+});
diff --git a/transforms/__testfixtures__/class-test2.js b/transforms/__testfixtures__/class-test2.js
deleted file mode 100644
index b0f04327..00000000
--- a/transforms/__testfixtures__/class-test2.js
+++ /dev/null
@@ -1,20 +0,0 @@
-'use strict';
-
-var React = require('React');
-
-// Comment
-module.exports = React.createClass({
-  propTypes: {
-    foo: React.PropTypes.bool,
-  },
-
-  getInitialState: function() {
-    return {
-      foo: 'bar',
-    };
-  },
-
-  render: function() {
-    return <div />;
-  },
-});
diff --git a/transforms/__testfixtures__/class-test2.output.js b/transforms/__testfixtures__/class-test2.output.js
index 68803e41..d6253f1b 100644
--- a/transforms/__testfixtures__/class-test2.output.js
+++ b/transforms/__testfixtures__/class-test2.output.js
@@ -1,14 +1,45 @@
 'use strict';
 
 var React = require('React');
+var ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
+var FooBarMixin = require('FooBarMixin');
+
+class ComponentWithNonSimpleInitialState extends React.Component {
+  static iDontKnowWhyYouNeedThis = true; // but comment it
+  static foo = 'bar';
+
+  static dontBindMe(count: number): any {
+    return this;
+  }
+
+  state = {
+    counter: this.props.initialNumber + 1,
+  };
+
+  render() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  }
+}
 
 // Comment
 module.exports = class extends React.Component {
-  constructor(props, context) {
-    super(props, context);
+  static propTypes = {
+    foo: React.PropTypes.bool,
+  };
+
+  static defaultProps = {
+    foo: 12,
+  };
+
+  constructor(props) {
+    super(props);
+    // non-simple getInitialState
+    var data = 'bar';
 
     this.state = {
-      foo: 'bar',
+      bar: data,
     };
   }
 
@@ -17,6 +48,65 @@ module.exports = class extends React.Component {
   }
 };
 
-module.exports.propTypes = {
-  foo: React.PropTypes.bool,
-};
+var ComponentWithInconvertibleMixins = React.createClass({
+  mixins: [ReactComponentWithPureRenderMixin, FooBarMixin],
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
+
+var listOfInconvertibleMixins = [ReactComponentWithPureRenderMixin, FooBarMixin];
+
+var ComponentWithInconvertibleMixins2 = React.createClass({
+  mixins: listOfInconvertibleMixins,
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
+
+// taken from https://facebook.github.io/react/docs/context.html#updating-context
+class MediaQuery extends React.Component {
+  static childContextTypes = {
+    type: React.PropTypes.string,
+  };
+
+  state = {type:'desktop'};
+
+  getChildContext() {
+    return {type: this.state.type};
+  }
+
+  componentDidMount() {
+    const checkMediaQuery = () => {
+      const type = window.matchMedia('(min-width: 1025px)').matches ? 'desktop' : 'mobile';
+      if (type !== this.state.type) {
+        this.setState({type});
+      }
+    };
+
+    window.addEventListener('resize', checkMediaQuery);
+    checkMediaQuery();
+  }
+
+  render() {
+    return this.props.children;
+  }
+}
diff --git a/transforms/__testfixtures__/class-top-comment.input.js b/transforms/__testfixtures__/class-top-comment.input.js
new file mode 100644
index 00000000..05b4c011
--- /dev/null
+++ b/transforms/__testfixtures__/class-top-comment.input.js
@@ -0,0 +1,25 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule FooBar
+ * @typechecks
+ * @flow
+ */
+var ReactComponentWithPureRenderMixin = require('ReactComponentWithPureRenderMixin');
+var React = require('React');
+
+var ComponentWithOnlyPureRenderMixin = React.createClass({
+  mixins: [ReactComponentWithPureRenderMixin],
+
+  getInitialState: function() {
+    return {
+      counter: this.props.initialNumber + 1,
+    };
+  },
+
+  render: function() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  },
+});
diff --git a/transforms/__testfixtures__/class-top-comment.output.js b/transforms/__testfixtures__/class-top-comment.output.js
new file mode 100644
index 00000000..f77f052b
--- /dev/null
+++ b/transforms/__testfixtures__/class-top-comment.output.js
@@ -0,0 +1,20 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule FooBar
+ * @typechecks
+ * @flow
+ */
+var React = require('React');
+
+class ComponentWithOnlyPureRenderMixin extends React.PureComponent {
+  state = {
+    counter: this.props.initialNumber + 1,
+  };
+
+  render() {
+    return (
+      <div>{this.state.counter}</div>
+    );
+  }
+}
diff --git a/transforms/__testfixtures__/class.input.js b/transforms/__testfixtures__/class.input.js
index a79ff180..96a0d9dc 100644
--- a/transforms/__testfixtures__/class.input.js
+++ b/transforms/__testfixtures__/class.input.js
@@ -5,28 +5,13 @@ var Relay = require('Relay');
 
 var Image = require('Image.react');
 
-/*
- * Multiline
- */
-var MyComponent = React.createClass({
-  getInitialState: function() {
-    var x = this.props.foo;
-    return {
-      heyoo: 23,
-    };
-  },
-
-  foo: function() {
-    this.setState({heyoo: 24});
-  },
-});
-
 // Class comment
 var MyComponent2 = React.createClass({
-  getDefaultProps: function() {
+  getDefaultProps: function(): Object {
     return {a: 1};
   },
-  foo: function() {
+  foo: function(): void {
+    const x = (a: Object, b: string): void => {}; // This code cannot be parsed by Babel v5
     pass(this.foo);
     this.forceUpdate();
   },
@@ -35,7 +20,7 @@ var MyComponent2 = React.createClass({
 var MyComponent3 = React.createClass({
   statics: {
     someThing: 10,
-    foo: function() {},
+    funcThatDoesNothing: function(): void {},
   },
   propTypes: {
     highlightEntities: React.PropTypes.bool,
@@ -47,7 +32,7 @@ var MyComponent3 = React.createClass({
   },
 
   getDefaultProps: function() {
-    foo();
+    unboundFunc();
     return {
       linkifyEntities: true,
       highlightEntities: false,
@@ -61,11 +46,12 @@ var MyComponent3 = React.createClass({
     };
   },
 
-  _renderText: function(text) {
+  // comment here
+  _renderText: function(text: string): ReactElement<any> { // say something
     return <Text text={text} />;
   },
 
-  _renderImageRange: function(text, range) {
+  _renderImageRange: function(text: string, range): ReactElement<any> {
     var image = range.image;
     if (image) {
       return (
@@ -80,13 +66,13 @@ var MyComponent3 = React.createClass({
   },
 
   autobindMe: function() {},
-  dontAutobindMe: function() {},
+  okBindMe: function(): number { return 12; },
 
   // Function comment
-  _renderRange: function(text, range) {
+  _renderRange: function(text: string, range, bla: Promise<string>): ReactElement<any> {
     var self = this;
 
-    self.dontAutobindMe();
+    self.okBindMe();
     call(self.autobindMe);
 
     var type = rage.type;
@@ -132,3 +118,97 @@ module.exports = Relay.createContainer(MyComponent, {
     me: Relay.graphql`this is not graphql`,
   },
 });
+
+var MyComponent5 = React.createClass({
+  getDefaultProps: function() {
+    return {
+      thisIs: true,
+      andThisIs: false,
+    };
+  },
+
+  statics: {},
+
+  getInitialState: function() {
+    return {
+      todos: [],
+    };
+  },
+
+  renderTodo: function(): ReactElement<any> {
+    return (
+      <div>
+        {this.state.todos.map((item) => <p key={item.id}>{item.text}</p>)}
+      </div>
+    );
+  },
+
+  render: function() {
+    return (
+      <div>
+        <h1>TODOs</h1>
+        {this.renderTodo()}
+      </div>
+    );
+  },
+});
+
+var GoodName = React.createClass({
+  displayName: 'GoodName',
+  render() {
+    return <div/>;
+  },
+});
+
+var SingleArgArrowFunction = React.createClass({
+  formatInt: function(/*number*/ num) /*string*/ {
+    return 'foobar';
+  },
+  render() {
+    return <div/>;
+  },
+});
+
+var mySpec = {};
+var NotAnObjectLiteral = React.createClass(mySpec);
+
+var WaitWhat = React.createClass();
+
+var HasSpreadArgs = React.createClass({
+  _helper: function(...args) {
+    return args;
+  },
+  _helper2: function(a, b, c, ...args) {
+    return args.concat(a);
+  },
+  _helper3: function(a: number, ...args: Array<string>) {
+    return args.concat('' + a);
+  },
+  render() {
+    return <div/>;
+  },
+});
+
+var HasDefaultArgs = React.createClass({
+  _helper: function(foo = 12) {
+    return foo;
+  },
+  _helper2: function({foo: number = 12, abc}, bar: string = 'hey', ...args: Array<string>) {
+    return args.concat(foo, bar);
+  },
+  render() {
+    return <div/>;
+  },
+});
+
+var ManyArgs = React.createClass({
+  _helper: function(foo = 12) {
+    return foo;
+  },
+  _helper2: function({foo: number = 12, abc}, bar: string = 'hey', x: number, y: number, ...args: Array<string>) {
+    return args.concat(foo, bar);
+  },
+  render() {
+    return <div/>;
+  },
+});
diff --git a/transforms/__testfixtures__/class.output.js b/transforms/__testfixtures__/class.output.js
index 6ffb8a2f..150c68d6 100644
--- a/transforms/__testfixtures__/class.output.js
+++ b/transforms/__testfixtures__/class.output.js
@@ -5,45 +5,40 @@ var Relay = require('Relay');
 
 var Image = require('Image.react');
 
-/*
- * Multiline
- */
-class MyComponent extends React.Component {
-  constructor(props, context) {
-    super(props, context);
-    var x = props.foo;
-
-    this.state = {
-      heyoo: 23,
-    };
-  }
-
-  foo() {
-    this.setState({heyoo: 24});
-  }
-}
-
 // Class comment
 class MyComponent2 extends React.Component {
-  constructor(props, context) {
-    super(props, context);
-    this.foo = this.foo.bind(this);
-  }
+  static defaultProps = {a: 1};
 
-  foo() {
+  foo = (): void => {
+    const x = (a: Object, b: string): void => {}; // This code cannot be parsed by Babel v5
     pass(this.foo);
     this.forceUpdate();
-  }
+  };
 }
 
-MyComponent2.defaultProps = {a: 1};
-
 class MyComponent3 extends React.Component {
-  constructor(props, context) {
-    super(props, context);
-    this._renderRange = this._renderRange.bind(this);
-    this._renderText = this._renderText.bind(this);
-    this.autobindMe = this.autobindMe.bind(this);
+  static someThing = 10;
+  static funcThatDoesNothing(): void {}
+
+  static propTypes = {
+    highlightEntities: React.PropTypes.bool,
+    linkifyEntities: React.PropTypes.bool,
+    text: React.PropTypes.shape({
+      text: React.PropTypes.string,
+      ranges: React.PropTypes.array,
+    }).isRequired,
+  };
+
+  static defaultProps = function() {
+    unboundFunc();
+    return {
+      linkifyEntities: true,
+      highlightEntities: false,
+    };
+  }();
+
+  constructor(props) {
+    super(props);
     props.foo();
 
     this.state = {
@@ -51,11 +46,12 @@ class MyComponent3 extends React.Component {
     };
   }
 
-  _renderText(text) {
+  // comment here
+  _renderText = (text: string): ReactElement<any> => { // say something
     return <Text text={text} />;
-  }
+  };
 
-  _renderImageRange(text, range) {
+  _renderImageRange = (text: string, range): ReactElement<any> => {
     var image = range.image;
     if (image) {
       return (
@@ -67,16 +63,16 @@ class MyComponent3 extends React.Component {
       );
     }
     return null;
-  }
+  };
 
-  autobindMe() {}
-  dontAutobindMe() {}
+  autobindMe = () => {};
+  okBindMe = (): number => { return 12; };
 
   // Function comment
-  _renderRange(text, range) {
+  _renderRange = (text: string, range, bla: Promise<string>): ReactElement<any> => {
     var self = this;
 
-    self.dontAutobindMe();
+    self.okBindMe();
     call(self.autobindMe);
 
     var type = rage.type;
@@ -96,7 +92,7 @@ class MyComponent3 extends React.Component {
     }
 
     return text;
-  }
+  };
 
   /* This is a comment */
   render() {
@@ -112,27 +108,6 @@ class MyComponent3 extends React.Component {
   }
 }
 
-MyComponent3.defaultProps = function() {
-  foo();
-  return {
-    linkifyEntities: true,
-    highlightEntities: false,
-  };
-}();
-
-MyComponent3.foo = function() {};
-
-MyComponent3.propTypes = {
-  highlightEntities: React.PropTypes.bool,
-  linkifyEntities: React.PropTypes.bool,
-  text: React.PropTypes.shape({
-    text: React.PropTypes.string,
-    ranges: React.PropTypes.array,
-  }).isRequired,
-};
-
-MyComponent3.someThing = 10;
-
 var MyComponent4 = React.createClass({
   foo: callMeMaybe(),
   render: function() {},
@@ -143,3 +118,106 @@ module.exports = Relay.createContainer(MyComponent, {
     me: Relay.graphql`this is not graphql`,
   },
 });
+
+class MyComponent5 extends React.Component {
+  static defaultProps = {
+    thisIs: true,
+    andThisIs: false,
+  };
+
+  state = {
+    todos: [],
+  };
+
+  renderTodo = (): ReactElement<any> => {
+    return (
+      <div>
+        {this.state.todos.map((item) => <p key={item.id}>{item.text}</p>)}
+      </div>
+    );
+  };
+
+  render() {
+    return (
+      <div>
+        <h1>TODOs</h1>
+        {this.renderTodo()}
+      </div>
+    );
+  }
+}
+
+class GoodName extends React.Component {
+  static displayName = 'GoodName';
+
+  render() {
+    return <div/>;
+  }
+}
+
+class SingleArgArrowFunction extends React.Component {
+  formatInt = (/*number*/ num) => /*string*/ {
+    return 'foobar';
+  };
+
+  render() {
+    return <div/>;
+  }
+}
+
+var mySpec = {};
+var NotAnObjectLiteral = React.createClass(mySpec);
+
+var WaitWhat = React.createClass();
+
+class HasSpreadArgs extends React.Component {
+  _helper = (...args) => {
+    return args;
+  };
+
+  _helper2 = (a, b, c, ...args) => {
+    return args.concat(a);
+  };
+
+  _helper3 = (a: number, ...args: Array<string>) => {
+    return args.concat('' + a);
+  };
+
+  render() {
+    return <div/>;
+  }
+}
+
+class HasDefaultArgs extends React.Component {
+  _helper = (foo = 12) => {
+    return foo;
+  };
+
+  _helper2 = ({foo: number = 12, abc}, bar: string = 'hey', ...args: Array<string>) => {
+    return args.concat(foo, bar);
+  };
+
+  render() {
+    return <div/>;
+  }
+}
+
+class ManyArgs extends React.Component {
+  _helper = (foo = 12) => {
+    return foo;
+  };
+
+  _helper2 = (
+    {foo: number = 12, abc},
+    bar: string = 'hey',
+    x: number,
+    y: number,
+    ...args: Array<string>
+  ) => {
+    return args.concat(foo, bar);
+  };
+
+  render() {
+    return <div/>;
+  }
+}
diff --git a/transforms/__testfixtures__/export-default-class.output.js b/transforms/__testfixtures__/export-default-class.output.js
index 21bc58c9..dec5942a 100644
--- a/transforms/__testfixtures__/export-default-class.output.js
+++ b/transforms/__testfixtures__/export-default-class.output.js
@@ -5,18 +5,14 @@
 import React from 'React';
 
 export default class extends React.Component {
-  constructor(props, context) {
-    super(props, context);
-
-    this.state = {
-      foo: 'bar',
-    };
-  }
-
   static propTypes = {
     foo: React.PropTypes.string,
   };
 
+  state = {
+    foo: 'bar',
+  };
+
   render() {
     return <div />;
   }
diff --git a/transforms/__tests__/class-test.js b/transforms/__tests__/class-test.js
index 02355b38..2442ca95 100644
--- a/transforms/__tests__/class-test.js
+++ b/transforms/__tests__/class-test.js
@@ -11,5 +11,46 @@
 'use strict';
 
 const defineTest = require('jscodeshift/dist/testUtils').defineTest;
+
+const pureMixinAlternativeOption = {
+  'mixin-module-name': 'ReactComponentWithPureRenderMixin',
+  'pure-component': true,
+};
+
+const enableFlowOption = {flow: true};
+
 defineTest(__dirname, 'class');
-defineTest(__dirname, 'class', null, 'export-default-class');
+defineTest(__dirname, 'class', enableFlowOption, 'class-anonymous');
+defineTest(__dirname, 'class', enableFlowOption, 'class-anonymous2');
+defineTest(__dirname, 'class', pureMixinAlternativeOption, 'class-test2');
+defineTest(__dirname, 'class', enableFlowOption, 'export-default-class');
+defineTest(__dirname, 'class', pureMixinAlternativeOption, 'class-pure-mixin1');
+defineTest(__dirname, 'class', {
+  ...enableFlowOption,
+  'pure-component': true,
+}, 'class-pure-mixin2');
+defineTest(__dirname, 'class', null, 'class-pure-mixin3');
+defineTest(__dirname, 'class', {
+  ...pureMixinAlternativeOption,
+  ...enableFlowOption,
+}, 'class-pure-mixin4');
+defineTest(__dirname, 'class', {
+  ...pureMixinAlternativeOption,
+  ...enableFlowOption,
+}, 'class-top-comment');
+defineTest(__dirname, 'class', {
+  ...pureMixinAlternativeOption,
+  ...enableFlowOption,
+}, 'class-access-default-props1');
+defineTest(__dirname, 'class', enableFlowOption, 'class-initial-state');
+defineTest(__dirname, 'class', enableFlowOption, 'class-property-field');
+defineTest(__dirname, 'class', enableFlowOption, 'class-flow1');
+defineTest(__dirname, 'class', enableFlowOption, 'class-flow2');
+defineTest(__dirname, 'class', enableFlowOption, 'class-flow3');
+defineTest(__dirname, 'class', enableFlowOption, 'class-flow4');
+defineTest(__dirname, 'class', enableFlowOption, 'class-flow5');
+defineTest(__dirname, 'class', enableFlowOption, 'class-flow6');
+defineTest(__dirname, 'class', {
+  ...enableFlowOption,
+  'remove-runtime-proptypes': true,
+}, 'class-flow7');
diff --git a/transforms/class.js b/transforms/class.js
index 4ddff794..6e1ee901 100644
--- a/transforms/class.js
+++ b/transforms/class.js
@@ -17,9 +17,18 @@ module.exports = (file, api, options) => {
   const ReactUtils = require('./utils/ReactUtils')(j);
 
   const printOptions =
-    options.printOptions || {quote: 'single', trailingComma: true};
+    options.printOptions || {
+      quote: 'single',
+      trailingComma: true,
+      flowObjectCommas: true,
+      arrowParensAlways: true,
+    };
+
   const root = j(file.source);
 
+  // retain top comments
+  const { comments: topComments } = root.find(j.Program).get('body', 0).node;
+
   const AUTOBIND_IGNORE_KEYS = {
     componentDidMount: true,
     componentDidUpdate: true,
@@ -27,6 +36,7 @@ module.exports = (file, api, options) => {
     componentWillMount: true,
     componentWillUpdate: true,
     componentWillUnmount: true,
+    getChildContext: true,
     getDefaultProps: true,
     getInitialState: true,
     render: true,
@@ -45,6 +55,9 @@ module.exports = (file, api, options) => {
     'setProps',
   ];
 
+  const PURE_MIXIN_MODULE_NAME = options['mixin-module-name'] ||
+    'react-addons-pure-render-mixin';
+
   const STATIC_KEY = 'statics';
 
   const STATIC_KEYS = {
@@ -54,6 +67,90 @@ module.exports = (file, api, options) => {
     propTypes: true,
   };
 
+  const MIXIN_KEY = 'mixins';
+
+  let shouldTransformFlow = false;
+
+  if (options['flow']) {
+    const programBodyNode = root.find(j.Program).get('body', 0).node;
+    if (programBodyNode && programBodyNode.comments) {
+      programBodyNode.comments.forEach(node => {
+        if (node.value.indexOf('@flow') !== -1) {
+          shouldTransformFlow = true;
+        }
+      });
+    }
+  }
+
+  // ---------------------------------------------------------------------------
+  // Helpers
+  const createFindPropFn = prop => property => (
+    property.key &&
+    property.key.type === 'Identifier' &&
+    property.key.name === prop
+  );
+
+  const filterDefaultPropsField = node =>
+    createFindPropFn(DEFAULT_PROPS_FIELD)(node);
+
+  const filterGetInitialStateField = node =>
+    createFindPropFn(GET_INITIAL_STATE_FIELD)(node);
+
+  const findGetInitialState = specPath =>
+    specPath.properties.find(createFindPropFn(GET_INITIAL_STATE_FIELD));
+
+  const withComments = (to, from) => {
+    to.comments = from.comments;
+    return to;
+  };
+
+  const isPrimExpression = node => (
+    node.type === 'Literal' || ( // NOTE this might change in babylon v6
+      node.type === 'Identifier' &&
+      node.name === 'undefined'
+  ));
+
+  const isFunctionExpression = node => (
+    node.key &&
+    node.key.type === 'Identifier' &&
+    node.value &&
+    node.value.type === 'FunctionExpression'
+  );
+
+  const isPrimProperty = prop => (
+    prop.key &&
+    prop.key.type === 'Identifier' &&
+    prop.value &&
+    isPrimExpression(prop.value)
+  );
+
+  const isPrimPropertyWithTypeAnnotation = prop => (
+    prop.key &&
+    prop.key.type === 'Identifier' &&
+    prop.value &&
+    prop.value.type === 'TypeCastExpression' &&
+    isPrimExpression(prop.value.expression)
+  );
+
+  const hasSingleReturnStatementWithObject = value => (
+    value.type === 'FunctionExpression' &&
+    value.body &&
+    value.body.type === 'BlockStatement' &&
+    value.body.body &&
+    value.body.body.length === 1 &&
+    value.body.body[0].type === 'ReturnStatement' &&
+    value.body.body[0].argument &&
+    value.body.body[0].argument.type === 'ObjectExpression'
+  );
+
+  const isInitialStateLiftable = getInitialState => {
+    if (!getInitialState || !(getInitialState.value)) {
+      return true;
+    }
+
+    return hasSingleReturnStatementWithObject(getInitialState.value);
+  };
+
   // ---------------------------------------------------------------------------
   // Checks if the module uses mixins or accesses deprecated APIs.
   const checkDeprecatedAPICalls = classPath =>
@@ -65,10 +162,10 @@ module.exports = (file, api, options) => {
       0
     ) > 0;
 
-  const callsDeprecatedAPIs = classPath => {
+  const hasNoCallsToDeprecatedAPIs = classPath => {
     if (checkDeprecatedAPICalls(classPath)) {
-      console.log(
-        file.path + ': `' + ReactUtils.getComponentName(classPath) + '` ' +
+      console.warn(
+        file.path + ': `' + ReactUtils.directlyGetComponentName(classPath) + '` ' +
         'was skipped because of deprecated API calls. Remove calls to ' +
         DEPRECATED_APIS.join(', ') + ' in your React component and re-run ' +
         'this script.'
@@ -78,15 +175,125 @@ module.exports = (file, api, options) => {
     return true;
   };
 
+  const hasNoRefsToAPIsThatWillBeRemoved = classPath => {
+    const hasInvalidCalls = (
+      j(classPath).find(j.MemberExpression, {
+        object: {type: 'ThisExpression'},
+        property: {name: DEFAULT_PROPS_FIELD},
+      }).size() > 0 ||
+      j(classPath).find(j.MemberExpression, {
+        object: {type: 'ThisExpression'},
+        property: {name: GET_INITIAL_STATE_FIELD},
+      }).size() > 0
+    );
+
+    if (hasInvalidCalls) {
+      console.warn(
+        file.path + ': `' + ReactUtils.directlyGetComponentName(classPath) + '` ' +
+        'was skipped because of API calls that will be removed. Remove calls to `' +
+        DEFAULT_PROPS_FIELD + '` and/or `' + GET_INITIAL_STATE_FIELD +
+        '` in your React component and re-run this script.'
+      );
+      return false;
+    }
+    return true;
+  };
+
+  const doesNotUseArguments = classPath => {
+    const hasArguments = (
+      j(classPath).find(j.Identifier, {name: 'arguments'}).size() > 0
+    );
+    if (hasArguments) {
+      console.warn(
+        file.path + ': `' + ReactUtils.directlyGetComponentName(classPath) + '` ' +
+        'was skipped because `arguments` was found in your functions. ' +
+        'Arrow functions do not expose an `arguments` object; ' +
+        'consider changing to use ES6 spread operator and re-run this script.'
+      );
+      return false;
+    }
+    return true;
+  };
+
+  const isGetInitialStateConstructorSafe = getInitialState => {
+    if (!getInitialState) {
+      return true;
+    }
+
+    const collection = j(getInitialState);
+    let result = true;
+
+    const propsVarDeclarationCount = collection.find(j.VariableDeclarator, {
+      id: {name: 'props'},
+    }).size();
+
+    const contextVarDeclarationCount = collection.find(j.VariableDeclarator, {
+      id: {name: 'context'},
+    }).size();
+
+    if (
+      propsVarDeclarationCount &&
+      propsVarDeclarationCount !== collection.find(j.VariableDeclarator, {
+        id: {name: 'props'},
+        init: {
+          type: 'MemberExpression',
+          object: {type: 'ThisExpression'},
+          property: {name: 'props'},
+        }
+      }).size()
+    ) {
+      result = false;
+    }
+
+    if (
+      contextVarDeclarationCount &&
+      contextVarDeclarationCount !== collection.find(j.VariableDeclarator, {
+        id: {name: 'context'},
+        init: {
+          type: 'MemberExpression',
+          object: {type: 'ThisExpression'},
+          property: {name: 'context'},
+        }
+      }).size()
+    ) {
+      result = false;
+    }
+
+    return result;
+  };
+
+  const isInitialStateConvertible = classPath => {
+    const specPath = ReactUtils.directlyGetCreateClassSpec(classPath);
+    if (!specPath) {
+      return false;
+    }
+    const result = isGetInitialStateConstructorSafe(findGetInitialState(specPath));
+    if (!result) {
+      console.warn(
+        file.path + ': `' + ReactUtils.directlyGetComponentName(classPath) + '` ' +
+        'was skipped because of potential shadowing issues were found in ' +
+        'the React component. Rename variable declarations of `props` and/or `context` ' +
+        'in your `getInitialState` and re-run this script.'
+      );
+    }
+    return result;
+  };
+
   const canConvertToClass = classPath => {
-    const specPath = ReactUtils.getReactCreateClassSpec(classPath);
+    const specPath = ReactUtils.directlyGetCreateClassSpec(classPath);
+    if (!specPath) {
+      return false;
+    }
     const invalidProperties = specPath.properties.filter(prop => (
       !prop.key.name || (
         !STATIC_KEYS[prop.key.name] &&
         STATIC_KEY != prop.key.name &&
         !filterDefaultPropsField(prop) &&
         !filterGetInitialStateField(prop) &&
-        !isFunctionExpression(prop)
+        !isFunctionExpression(prop) &&
+        !isPrimProperty(prop) &&
+        !isPrimPropertyWithTypeAnnotation(prop) &&
+        MIXIN_KEY != prop.key.name
       )
     ));
 
@@ -94,8 +301,8 @@ module.exports = (file, api, options) => {
       const invalidText = invalidProperties
         .map(prop => prop.key.name ? prop.key.name : prop.key)
         .join(', ');
-      console.log(
-        file.path + ': `' + ReactUtils.getComponentName(classPath) + '` ' +
+      console.warn(
+        file.path + ': `' + ReactUtils.directlyGetComponentName(classPath) + '` ' +
         'was skipped because of invalid field(s) `' + invalidText + '` on ' +
         'the React component. Remove any right-hand-side expressions that ' +
         'are not simple, like: `componentWillUpdate: createWillUpdate()` or ' +
@@ -105,138 +312,110 @@ module.exports = (file, api, options) => {
     return !invalidProperties.length;
   };
 
-  const hasMixins = classPath => {
-    if (ReactUtils.hasMixins(classPath)) {
-      console.log(
-        file.path + ': `' + ReactUtils.getComponentName(classPath) + '` ' +
-        'was skipped because of mixins.'
-      );
+  const areMixinsConvertible = (mixinIdentifierNames, classPath) => {
+    if (
+      ReactUtils.directlyHasMixinsField(classPath) &&
+      !ReactUtils.directlyHasSpecificMixins(classPath, mixinIdentifierNames)
+    ) {
       return false;
     }
     return true;
   };
 
   // ---------------------------------------------------------------------------
-  // Helpers
-  const createFindPropFn = prop => property => (
-    property.key &&
-    property.key.type === 'Identifier' &&
-    property.key.name === prop
-  );
-
-  const filterDefaultPropsField = node =>
-    createFindPropFn(DEFAULT_PROPS_FIELD)(node);
-
-  const filterGetInitialStateField = node =>
-    createFindPropFn(GET_INITIAL_STATE_FIELD)(node);
-
-  const findGetDefaultProps = specPath =>
-    specPath.properties.find(createFindPropFn(DEFAULT_PROPS_FIELD));
-
-  const findGetInitialState = specPath =>
-    specPath.properties.find(createFindPropFn(GET_INITIAL_STATE_FIELD));
-
-  const withComments = (to, from) => {
-    to.comments = from.comments;
-    return to;
+  // Collectors
+  const pickReturnValueOrCreateIIFE = value => {
+    if (hasSingleReturnStatementWithObject(value)) {
+      return value.body.body[0].argument;
+    } else {
+      return j.callExpression(
+        value,
+        []
+      );
+    }
   };
 
-  // ---------------------------------------------------------------------------
-  // Collectors
-  const isFunctionExpression = node => (
-    node.key &&
-    node.key.type === 'Identifier' &&
-    node.value &&
-    node.value.type === 'FunctionExpression'
-  );
+  const createDefaultProps = prop =>
+    withComments(
+      j.property(
+        'init',
+        j.identifier(DEFAULT_PROPS_KEY),
+        pickReturnValueOrCreateIIFE(prop.value)
+      ),
+      prop
+    );
 
+  // Collects `childContextTypes`, `contextTypes`, `displayName`, and `propTypes`;
+  // simplifies `getDefaultProps` or converts it to an IIFE;
+  // and collects everything else in the `statics` property object.
   const collectStatics = specPath => {
-    const statics = specPath.properties.find(createFindPropFn('statics'));
-    const staticsObject =
-      (statics && statics.value && statics.value.properties) || [];
-
-    const getDefaultProps = findGetDefaultProps(specPath);
-    if (getDefaultProps) {
-      staticsObject.push(createDefaultProps(getDefaultProps));
+    const result = [];
+
+    for (let i = 0; i < specPath.properties.length; i++) {
+      const property = specPath.properties[i];
+      if (createFindPropFn('statics')(property) && property.value && property.value.properties) {
+        result.push(...property.value.properties);
+      } else if (createFindPropFn(DEFAULT_PROPS_FIELD)(property)) {
+        result.push(createDefaultProps(property));
+      } else if (property.key && STATIC_KEYS[property.key.name]) {
+        result.push(property);
+      }
     }
 
-    return (
-      staticsObject.concat(specPath.properties.filter(property =>
-        property.key && STATIC_KEYS[property.key.name]
-      ))
-      .sort((a, b) => a.key.name < b.key.name)
-    );
+    return result;
   };
 
-  const collectFunctions = specPath => specPath.properties
+  const collectNonStaticProperties = specPath => specPath.properties
     .filter(prop =>
       !(filterDefaultPropsField(prop) || filterGetInitialStateField(prop))
     )
-    .filter(isFunctionExpression);
-
-  const findAutobindNamesFor = (subtree, fnNames, literalOrIdentifier) => {
-    const node = literalOrIdentifier;
-    const autobindNames = {};
-
-    j(subtree)
-      .find(j.MemberExpression, {
-        object: node.name ? {
-          type: node.type,
-          name: node.name,
-        } : {type: node.type},
-        property: {
-          type: 'Identifier',
-        },
-      })
-      .filter(path => path.value.property && fnNames[path.value.property.name])
-      .filter(path => {
-        const call = path.parent.value;
-        return !(
-          call &&
-          call.type === 'CallExpression' &&
-          call.callee.type === 'MemberExpression' &&
-          call.callee.object.type === node.type &&
-          call.callee.object.name === node.name &&
-          call.callee.property.type === 'Identifier' &&
-          call.callee.property.name === path.value.property.name
-        );
-      })
-      .forEach(path => autobindNames[path.value.property.name] = true);
-
-    return Object.keys(autobindNames);
-  };
+    .filter(prop => (!STATIC_KEYS[prop.key.name]) && prop.key.name !== STATIC_KEY)
+    .filter(prop =>
+      isFunctionExpression(prop) ||
+      isPrimPropertyWithTypeAnnotation(prop) ||
+      isPrimProperty(prop)
+    );
 
-  const collectAutoBindFunctions = (functions, classPath) => {
-    const fnNames = {};
-    functions
-      .filter(fn => !AUTOBIND_IGNORE_KEYS[fn.key.name])
-      .forEach(fn => fnNames[fn.key.name] = true);
+  const findRequirePathAndBinding = (moduleName) => {
+    let result = null;
 
-    const autobindNames = {};
-    const add = name => autobindNames[name] = true;
+    const requireCall = root.find(j.VariableDeclarator, {
+      id: {type: 'Identifier'},
+      init: {
+        callee: {name: 'require'},
+        arguments: [{value: moduleName}],
+      },
+    });
 
-    // Find `this.<foo>`
-    findAutobindNamesFor(classPath, fnNames, j.thisExpression()).forEach(add);
+    const importStatement = root.find(j.ImportDeclaration, {
+      source: {
+        value: moduleName,
+      },
+    });
 
-    // Find `self.<foo>` if `self = this`
-    j(classPath)
-      .findVariableDeclarators()
-      .filter(path => (
-        path.value.id.type === 'Identifier' &&
-        path.value.init &&
-        path.value.init.type === 'ThisExpression'
-      ))
-      .forEach(path =>
-        findAutobindNamesFor(
-          j(path).closest(j.FunctionExpression).get(),
-          fnNames,
-          path.value.id
-        ).forEach(add)
-      );
+    if (importStatement.size()) {
+      importStatement.forEach(path => {
+        result = {
+          path,
+          binding: path.value.specifiers[0].id.name,
+          type: 'import',
+        };
+      });
+    } else if (requireCall.size()) {
+      requireCall.forEach(path => {
+        result = {
+          path,
+          binding: path.value.id.name,
+          type: 'require',
+        };
+      });
+    }
 
-    return Object.keys(autobindNames).sort();
+    return result;
   };
 
+  const pureRenderMixinPathAndBinding = findRequirePathAndBinding(PURE_MIXIN_MODULE_NAME);
+
   // ---------------------------------------------------------------------------
   // Boom!
   const createMethodDefinition = fn =>
@@ -246,54 +425,72 @@ module.exports = (file, api, options) => {
       fn.value
     ), fn);
 
-  const createBindAssignment = name =>
-    j.expressionStatement(
-      j.assignmentExpression(
-        '=',
-        j.memberExpression(
-          j.thisExpression(),
-          j.identifier(name),
-          false
-        ),
-        j.callExpression(
-          j.memberExpression(
-            j.memberExpression(
-              j.thisExpression(),
-              j.identifier(name),
-              false
-            ),
-            j.identifier('bind'),
-            false
-          ),
-          [j.thisExpression()]
-        )
-      )
-    );
+  const updatePropsAndContextAccess = getInitialState => {
+    const collection = j(getInitialState);
+
+    collection.find(j.MemberExpression, {
+      object: {
+        type: 'ThisExpression',
+      },
+      property: {
+        type: 'Identifier',
+        name: 'props',
+      },
+    }).forEach(path => j(path).replaceWith(j.identifier('props')));
+
+    collection.find(j.MemberExpression, {
+      object: {
+        type: 'ThisExpression',
+      },
+      property: {
+        type: 'Identifier',
+        name: 'context',
+      },
+    }).forEach(path => j(path).replaceWith(j.identifier('context')));
+  };
 
-  const updatePropsAccess = getInitialState =>
-    getInitialState ?
-      j(getInitialState)
-        .find(j.MemberExpression, {
-          object: {
-            type: 'ThisExpression',
-          },
-          property: {
-            type: 'Identifier',
-            name: 'props',
-          },
-        })
-        .forEach(path => j(path).replaceWith(j.identifier('props')))
-        .size() > 0 :
-      false;
 
   const inlineGetInitialState = getInitialState => {
-    if (!getInitialState) {
-      return [];
-    }
+    const functionExpressionCollection = j(getInitialState.value);
+
+    // at this point if there exists bindings like `const props = ...`, we
+    // already know the RHS must be `this.props` (see `isGetInitialStateConstructorSafe`)
+    // so it's safe to just remove them
+    functionExpressionCollection.find(j.VariableDeclarator, {id: {name: 'props'}})
+      .forEach(path => j(path).remove());
+
+    functionExpressionCollection.find(j.VariableDeclarator, {id: {name: 'context'}})
+      .forEach(path => j(path).remove());
 
-    return getInitialState.value.body.body.map(statement => {
-      if (statement.type === 'ReturnStatement') {
-        return j.expressionStatement(
+    return functionExpressionCollection
+      .find(j.ReturnStatement)
+      .filter(path => {
+        // filter out inner function declarations here (helper functions, promises, etc.).
+        const mainBodyCollection = j(getInitialState.value.body);
+        return (
+          mainBodyCollection
+            .find(j.ArrowFunctionExpression)
+            .find(j.ReturnStatement, path.value)
+            .size() === 0 &&
+          mainBodyCollection
+            .find(j.FunctionDeclaration)
+            .find(j.ReturnStatement, path.value)
+            .size() === 0 &&
+          mainBodyCollection
+            .find(j.FunctionExpression)
+            .find(j.ReturnStatement, path.value)
+            .size() === 0
+        );
+      })
+      .forEach(path => {
+        let shouldInsertReturnAfterAssignment = false;
+
+        // if the return statement is not a direct child of getInitialState's body
+        if (getInitialState.value.body.body.indexOf(path.value) === -1) {
+          shouldInsertReturnAfterAssignment = true;
+        }
+
+        j(path).replaceWith(j.expressionStatement(
           j.assignmentExpression(
             '=',
             j.memberExpression(
@@ -301,45 +498,73 @@ module.exports = (file, api, options) => {
               j.identifier('state'),
               false
             ),
-            statement.argument
+            path.value.argument
           )
-        );
-      }
+        ));
 
-      return statement;
-    });
+        if (shouldInsertReturnAfterAssignment) {
+          j(path).insertAfter(j.returnStatement(null));
+        }
+      }).getAST()[0].value.body.body;
   };
 
-  const createConstructorArgs = (hasPropsAccess) => {
-    return [j.identifier('props'), j.identifier('context')];
+  const convertInitialStateToClassProperty = getInitialState =>
+    withComments(j.classProperty(
+      j.identifier('state'),
+      pickReturnValueOrCreateIIFE(getInitialState.value),
+      getInitialState.value.returnType,
+      false
+    ), getInitialState);
+
+  const createConstructorArgs = (hasContextAccess) => {
+    if (hasContextAccess) {
+      return [j.identifier('props'), j.identifier('context')];
+    }
+
+    return [j.identifier('props')];
   };
 
-  const createConstructor = (
-    getInitialState,
-    autobindFunctions
-  ) => {
-    if (!getInitialState && !autobindFunctions.length) {
-      return [];
+  const createConstructor = (getInitialState) => {
+    const initialStateAST = j(getInitialState);
+    let hasContextAccess = false;
+
+    if (
+      initialStateAST.find(j.MemberExpression, { // has `this.context` access
+        object: {type: 'ThisExpression'},
+        property: {type: 'Identifier', name: 'context'},
+      }).size() ||
+      initialStateAST.find(j.CallExpression, { // a direct method call `this.x()`
+        callee: {
+          type: 'MemberExpression',
+          object: {type: 'ThisExpression'},
+        },
+      }).size() ||
+      initialStateAST.find(j.MemberExpression, { // `this` is referenced alone
+        object: {type: 'ThisExpression'},
+      }).size() !== initialStateAST.find(j.ThisExpression).size()
+    ) {
+      hasContextAccess = true;
     }
 
-    const hasPropsAccess = updatePropsAccess(getInitialState);
+    updatePropsAndContextAccess(getInitialState);
+    const constructorArgs = createConstructorArgs(hasContextAccess);
+
     return [
       createMethodDefinition({
         key: j.identifier('constructor'),
         value: j.functionExpression(
           null,
-          createConstructorArgs(hasPropsAccess),
+          constructorArgs,
           j.blockStatement(
             [].concat(
               [
                 j.expressionStatement(
                   j.callExpression(
                     j.identifier('super'),
-                    [j.identifier('props'), j.identifier('context')]
+                    constructorArgs
                   )
                 ),
               ],
-              autobindFunctions.map(createBindAssignment),
               inlineGetInitialState(getInitialState)
             )
           )
@@ -348,90 +573,433 @@ module.exports = (file, api, options) => {
     ];
   };
 
+  const createArrowFunctionExpression = fn => {
+    const arrowFunc = j.arrowFunctionExpression(
+      fn.params,
+      fn.body,
+      false
+    );
+
+    arrowFunc.returnType = fn.returnType;
+    arrowFunc.defaults = fn.defaults;
+    arrowFunc.rest = fn.rest;
+
+    return arrowFunc;
+  };
+
+  const createArrowProperty = prop =>
+    withComments(j.classProperty(
+      j.identifier(prop.key.name),
+      createArrowFunctionExpression(prop.value),
+      null,
+      false
+    ), prop);
+
+  const createClassProperty = prop =>
+    withComments(j.classProperty(
+      j.identifier(prop.key.name),
+      prop.value,
+      null,
+      false
+    ), prop);
+
+  const createClassPropertyWithType = prop =>
+    withComments(j.classProperty(
+      j.identifier(prop.key.name),
+      prop.value.expression,
+      prop.value.typeAnnotation,
+      false
+    ), prop);
+
+  // ---------------------------------------------------------------------------
+  // Flow!
+
+  const flowAnyType = j.anyTypeAnnotation();
+  const flowFixMeType = j.genericTypeAnnotation(
+    j.identifier('$FlowFixMe'),
+    null
+  );
+
+  const literalToFlowType = node => {
+    if (node.type === 'Identifier' && node.name === 'undefined') {
+      return j.voidTypeAnnotation();
+    }
+
+    switch (typeof node.value) {
+      case 'string':
+        return j.stringLiteralTypeAnnotation(node.value, node.raw);
+      case 'number':
+        return j.numberLiteralTypeAnnotation(node.value, node.raw);
+      case 'boolean':
+        return j.booleanLiteralTypeAnnotation(node.value, node.raw);
+      case 'object': // we already know it's a NullLiteral here
+        return j.nullLiteralTypeAnnotation();
+      default: // this should never happen
+        return flowFixMeType;
+    }
+  };
+
+  const propTypeToFlowMapping = {
+    // prim types
+    any: flowAnyType,
+    array: j.genericTypeAnnotation(
+      j.identifier('Array'),
+      j.typeParameterInstantiation([flowFixMeType])
+    ),
+    bool: j.booleanTypeAnnotation(),
+    element: flowFixMeType, // flow does the same for `element` type in `propTypes`
+    func: j.genericTypeAnnotation(
+      j.identifier('Function'),
+      null
+    ),
+    node: flowFixMeType, // flow does the same for `node` type in `propTypes`
+    number: j.numberTypeAnnotation(),
+    object: j.genericTypeAnnotation(
+      j.identifier('Object'),
+      null
+    ),
+    string: j.stringTypeAnnotation(),
+
+    // type classes
+    arrayOf: (type) => j.genericTypeAnnotation(
+      j.identifier('Array'),
+      j.typeParameterInstantiation([type])
+    ),
+    instanceOf: (type) => j.genericTypeAnnotation(
+      type,
+      null
+    ),
+    objectOf: (type) => j.objectTypeAnnotation([], [
+      j.objectTypeIndexer(
+        j.identifier('key'),
+        j.stringTypeAnnotation(),
+        type
+      )
+    ]),
+    oneOf: (typeList) => j.unionTypeAnnotation(typeList),
+    oneOfType: (typeList) => j.unionTypeAnnotation(typeList),
+    shape: (propList) => j.objectTypeAnnotation(propList),
+  };
+
+  const propTypeToFlowAnnotation = val => {
+    let cursor = val;
+    let isOptional = true;
+    let typeResult = flowFixMeType;
+
+    if ( // check `.isRequired` first
+      cursor.type === 'MemberExpression' &&
+      cursor.property.type === 'Identifier' &&
+      cursor.property.name === 'isRequired'
+    ) {
+      isOptional = false;
+      cursor = cursor.object;
+    }
+
+    switch (cursor.type) {
+      case 'CallExpression': { // type class
+        const calleeName = cursor.callee.type === 'MemberExpression' ?
+          cursor.callee.property.name :
+          cursor.callee.name;
+
+        const constructor = propTypeToFlowMapping[calleeName];
+        if (!constructor) { // unknown type class
+          // it's not necessary since `typeResult` defaults to `flowFixMeType`,
+          // but it's more explicit this way
+          typeResult = flowFixMeType;
+          break;
+        }
+
+        switch (cursor.callee.property.name) {
+          case 'arrayOf': {
+            const arg = cursor.arguments[0];
+            typeResult = constructor(
+              propTypeToFlowAnnotation(arg)[0]
+            );
+            break;
+          }
+          case 'instanceOf': {
+            const arg = cursor.arguments[0];
+            if (arg.type !== 'Identifier') {
+              typeResult = flowFixMeType;
+              break;
+            }
+
+            typeResult = constructor(arg);
+            break;
+          }
+          case 'objectOf': {
+            const arg = cursor.arguments[0];
+            typeResult = constructor(
+              propTypeToFlowAnnotation(arg)[0]
+            );
+            break;
+          }
+          case 'oneOf': {
+            const argList = cursor.arguments[0].elements;
+            if (
+              !argList ||
+              !argList.every(node =>
+                (node.type === 'Literal') ||
+                (node.type === 'Identifier' && node.name === 'undefined')
+              )
+            ) {
+              typeResult = flowFixMeType;
+            } else {
+              typeResult = constructor(
+                argList.map(literalToFlowType)
+              );
+            }
+            break;
+          }
+          case 'oneOfType': {
+            const argList = cursor.arguments[0].elements;
+            if (!argList) {
+              typeResult = flowFixMeType;
+            } else {
+              typeResult = constructor(
+                argList.map(arg => propTypeToFlowAnnotation(arg)[0])
+              );
+            }
+            break;
+          }
+          case 'shape': {
+            const rawPropList = cursor.arguments[0].properties;
+            if (!rawPropList) {
+              typeResult = flowFixMeType;
+              break;
+            }
+            const flowPropList = [];
+            rawPropList.forEach(typeProp => {
+              const keyIsLiteral = typeProp.key.type === 'Literal';
+              const name = keyIsLiteral ? typeProp.key.value : typeProp.key.name;
+
+              const [valueType, isOptional] = propTypeToFlowAnnotation(typeProp.value);
+              flowPropList.push(j.objectTypeProperty(
+                keyIsLiteral ? j.literal(name) : j.identifier(name),
+                valueType,
+                isOptional
+              ));
+            });
+
+            typeResult = constructor(flowPropList);
+            break;
+          }
+          default: {
+            break;
+          }
+        }
+        break;
+      }
+      case 'MemberExpression': { // prim type
+        if (cursor.property.type !== 'Identifier') { // unrecognizable
+          typeResult = flowFixMeType;
+          break;
+        }
+
+        const maybeType = propTypeToFlowMapping[cursor.property.name];
+        if (maybeType) {
+          typeResult = propTypeToFlowMapping[cursor.property.name];
+        } else { // type not found
+          typeResult = flowFixMeType;
+        }
+
+        break;
+      }
+      default: { // unrecognizable
+        break;
+      }
+    }
+
+    return [typeResult, isOptional];
+  };
+
+  const createFlowAnnotationsFromPropTypesProperties = (prop) => {
+    const typePropertyList = [];
+
+    if (!prop || prop.value.type !== 'ObjectExpression') {
+      return typePropertyList;
+    }
+
+    prop.value.properties.forEach(typeProp => {
+      if (!typeProp.key) { // stuff like SpreadProperty
+        return;
+      }
+
+      const keyIsLiteral = typeProp.key.type === 'Literal';
+      const name = keyIsLiteral ? typeProp.key.value : typeProp.key.name;
+
+      const [valueType, isOptional] = propTypeToFlowAnnotation(typeProp.value);
+      typePropertyList.push(j.objectTypeProperty(
+        keyIsLiteral ? j.literal(name) : j.identifier(name),
+        valueType,
+        isOptional
+      ));
+    });
+
+    return j.classProperty(
+      j.identifier('props'),
+      null,
+      j.typeAnnotation(j.objectTypeAnnotation(typePropertyList)),
+      false
+    );
+  };
+
+  // to ensure that our property initializers' evaluation order is safe
+  const repositionStateProperty = (initialStateProperty, propertiesAndMethods) => {
+    const initialStateCollection = j(initialStateProperty);
+    const thisCount = initialStateCollection.find(j.ThisExpression).size();
+    const safeThisMemberCount = initialStateCollection.find(j.MemberExpression, {
+      object: {
+        type: 'ThisExpression',
+      },
+      property: {
+        type: 'Identifier',
+        name: 'props',
+      },
+    }).size() + initialStateCollection.find(j.MemberExpression, {
+      object: {
+        type: 'ThisExpression',
+      },
+      property: {
+        type: 'Identifier',
+        name: 'context',
+      },
+    }).size();
+
+    if (thisCount === safeThisMemberCount) {
+      return initialStateProperty.concat(propertiesAndMethods);
+    }
+
+    const result = [].concat(propertiesAndMethods);
+    let lastPropPosition = result.length - 1;
+
+    while (lastPropPosition >= 0 && result[lastPropPosition].kind === 'method') {
+      lastPropPosition--;
+    }
+
+    result.splice(lastPropPosition + 1, 0, initialStateProperty[0]);
+    return result;
+  };
+
+  // if there's no `getInitialState` or the `getInitialState` function is simple
+  // (i.e., it's just a return statement) then we don't need a constructor.
+  // we can simply lift `state = {...}` as a property initializer.
+  // otherwise, create a constructor and inline `this.state = ...`.
+  //
+  // when we need to create a constructor, we only put `context` as the
+  // second parameter when the following things happen in `getInitialState()`:
+  // 1. there's a `this.context` access, or
+  // 2. there's a direct method call `this.x()`, or
+  // 3. `this` is referenced alone
   const createESClass = (
     name,
-    properties,
+    baseClassName,
+    staticProperties,
     getInitialState,
-    autobindFunctions,
+    rawProperties,
     comments
-  ) =>
-    withComments(j.classDeclaration(
+  ) => {
+    const initialStateProperty = [];
+    let maybeConstructor = [];
+    let maybeFlowStateAnnotation = []; // we only need this when we do `this.state = ...`
+
+    if (isInitialStateLiftable(getInitialState)) {
+      if (getInitialState) {
+        initialStateProperty.push(convertInitialStateToClassProperty(getInitialState));
+      }
+    } else {
+      maybeConstructor = createConstructor(getInitialState);
+      if (shouldTransformFlow) {
+        let stateType = j.typeAnnotation(
+          j.genericTypeAnnotation(j.identifier('Object'), null)
+        );
+
+        if (getInitialState.value.returnType) {
+          stateType = getInitialState.value.returnType;
+        }
+
+        maybeFlowStateAnnotation.push(j.classProperty(
+          j.identifier('state'),
+          null,
+          stateType,
+          false
+        ));
+      }
+    }
+
+    const propertiesAndMethods = rawProperties.map(prop => {
+      if (isPrimPropertyWithTypeAnnotation(prop)) {
+        return createClassPropertyWithType(prop);
+      } else if (isPrimProperty(prop)) {
+        return createClassProperty(prop);
+      } else if (AUTOBIND_IGNORE_KEYS[prop.key.name]) {
+        return createMethodDefinition(prop);
+      }
+
+      return createArrowProperty(prop);
+    });
+
+    const flowPropsAnnotation = shouldTransformFlow ?
+      createFlowAnnotationsFromPropTypesProperties(
+        staticProperties.find((path) => path.key.name === 'propTypes')
+      ) :
+      [];
+
+    let finalStaticProperties = staticProperties;
+
+    if (shouldTransformFlow && options['remove-runtime-proptypes']) {
+      finalStaticProperties = staticProperties.filter((prop) => prop.key.name !== 'propTypes');
+    }
+
+    return withComments(j.classDeclaration(
       name ? j.identifier(name) : null,
       j.classBody(
         [].concat(
-          createConstructor(
-            getInitialState,
-            autobindFunctions
-          ),
-          properties
+          flowPropsAnnotation,
+          maybeFlowStateAnnotation,
+          finalStaticProperties,
+          maybeConstructor,
+          repositionStateProperty(initialStateProperty, propertiesAndMethods)
         )
       ),
       j.memberExpression(
         j.identifier('React'),
-        j.identifier('Component'),
+        j.identifier(baseClassName),
         false
       )
     ), {comments});
+  };
 
-  const createStaticAssignment = (name, staticProperty) =>
-    withComments(j.expressionStatement(
-      j.assignmentExpression(
-        '=',
-        j.memberExpression(
-          name,
-          j.identifier(staticProperty.key.name),
-          false
-        ),
-        staticProperty.value
-      )
-    ), staticProperty);
+  const createStaticClassProperty = staticProperty => {
+    if (staticProperty.value.type === 'FunctionExpression') {
+      return withComments(j.methodDefinition(
+        'method',
+        j.identifier(staticProperty.key.name),
+        staticProperty.value,
+        true
+      ), staticProperty);
+    }
 
-  const createStaticAssignmentExpressions = (name, statics) =>
-    statics.map(staticProperty => createStaticAssignment(name, staticProperty));
+    if (staticProperty.value.type === 'TypeCastExpression') {
+      return withComments(j.classProperty(
+        j.identifier(staticProperty.key.name),
+        staticProperty.value.expression,
+        staticProperty.value.typeAnnotation,
+        true
+      ), staticProperty);
+    }
 
-  const createStaticClassProperty = staticProperty =>
-    withComments(j.classProperty(
+    return withComments(j.classProperty(
       j.identifier(staticProperty.key.name),
       staticProperty.value,
       null,
       true
     ), staticProperty);
+  };
 
   const createStaticClassProperties = statics =>
     statics.map(createStaticClassProperty);
 
-  const hasSingleReturnStatement = value => (
-    value.type === 'FunctionExpression' &&
-    value.body &&
-    value.body.type === 'BlockStatement' &&
-    value.body.body &&
-    value.body.body.length === 1 &&
-    value.body.body[0].type === 'ReturnStatement' &&
-    value.body.body[0].argument &&
-    value.body.body[0].argument.type === 'ObjectExpression'
-  );
-
-  const createDefaultPropsValue = value => {
-    if (hasSingleReturnStatement(value)) {
-      return value.body.body[0].argument;
-    } else {
-      return j.callExpression(
-        value,
-        []
-      );
-    }
-  };
-
-  const createDefaultProps = prop =>
-    withComments(
-      j.property(
-        'init',
-        j.identifier(DEFAULT_PROPS_KEY),
-        createDefaultPropsValue(prop.value)
-      ),
-      prop
-    );
-
   const getComments = classPath => {
     if (classPath.value.comments) {
       return classPath.value.comments;
@@ -443,83 +1011,164 @@ module.exports = (file, api, options) => {
     return null;
   };
 
-  const createModuleExportsMemberExpression = () =>
-    j.memberExpression(
-      j.identifier('module'),
-      j.identifier('exports'),
-      false
-    );
+  const findUnusedVariables = (path, varName) => j(path)
+    .closestScope()
+    .find(j.Identifier, {name: varName})
+    // Ignore require vars
+    .filter(identifierPath => identifierPath.value !== path.value.id)
+    // Ignore import bindings
+    .filter(identifierPath => !(
+      path.value.type === 'ImportDeclaration' &&
+      path.value.specifiers.some(specifier => specifier.id === identifierPath.value)
+    ))
+    // Ignore properties in MemberExpressions
+    .filter(identifierPath => {
+      const parent = identifierPath.parent.value;
+      return !(
+        j.MemberExpression.check(parent) &&
+        parent.property === identifierPath.value
+      );
+    });
+
+  // convert `OtherClass.getDefaultProps()` to `OtherClass.defaultProps`
+  const updateOtherDefaultPropsAccess = (classPath) => {
+    j(classPath)
+      .find(j.CallExpression, {
+        callee: {
+          type: 'MemberExpression',
+          property: { name: 'getDefaultProps' },
+        },
+      })
+      .forEach(path => j(path).replaceWith(
+        j.memberExpression(
+          path.value.callee.object,
+          j.identifier('defaultProps')
+      )));
+  };
 
-  const updateToClass = (classPath, type) => {
-    const specPath = ReactUtils.getReactCreateClassSpec(classPath);
-    const name = ReactUtils.getComponentName(classPath);
+  const updateToClass = (classPath) => {
+    const specPath = ReactUtils.directlyGetCreateClassSpec(classPath);
+    const name = ReactUtils.directlyGetComponentName(classPath);
     const statics = collectStatics(specPath);
-    const functions = collectFunctions(specPath);
+    const properties = collectNonStaticProperties(specPath);
     const comments = getComments(classPath);
 
-    const autobindFunctions = collectAutoBindFunctions(functions, classPath);
     const getInitialState = findGetInitialState(specPath);
 
-    const staticName =
-      name ? j.identifier(name) : createModuleExportsMemberExpression();
-
-    var path;
-    if (type == 'moduleExports' || type == 'exportDefault') {
-      path = ReactUtils.findReactCreateClassCallExpression(classPath);
-    } else {
-      path = j(classPath).closest(j.VariableDeclaration);
+    var path = classPath;
+
+    if (
+      classPath.parentPath &&
+      classPath.parentPath.value &&
+      classPath.parentPath.value.type === 'VariableDeclarator'
+    ) {
+      // the reason that we need to do this awkward dance here is that
+      // for things like `var Foo = React.createClass({...})`, we need to
+      // replace the _entire_ VariableDeclaration with
+      // `class Foo extends React.Component {...}`.
+      // it looks scary but since we already know it's a VariableDeclarator
+      // it's actually safe.
+      // (VariableDeclaration > declarations > VariableDeclarator > CallExpression)
+      path = classPath.parentPath.parentPath.parentPath;
     }
 
-    const properties =
-      (type == 'exportDefault') ? createStaticClassProperties(statics) : [];
+    const staticProperties = createStaticClassProperties(statics);
+    const baseClassName =
+      pureRenderMixinPathAndBinding &&
+      ReactUtils.directlyHasSpecificMixins(classPath, [pureRenderMixinPathAndBinding.binding]) ?
+        'PureComponent' :
+        'Component';
 
-    path.replaceWith(
+    j(path).replaceWith(
       createESClass(
         name,
-        properties.concat(functions.map(createMethodDefinition)),
+        baseClassName,
+        staticProperties,
         getInitialState,
-        autobindFunctions,
+        properties,
         comments
       )
     );
 
-    if (type == 'moduleExports' || type == 'var') {
-      const staticAssignments = createStaticAssignmentExpressions(
-        staticName,
-        statics
-      );
-      if (type == 'moduleExports') {
-        root.get().value.program.body.push(...staticAssignments);
-      } else {
-        path.insertAfter(staticAssignments.reverse());
-      }
-    }
+    updateOtherDefaultPropsAccess(path);
   };
 
   if (
     options['explicit-require'] === false || ReactUtils.hasReact(root)
   ) {
-    const apply = (path, type) =>
+    // no mixins found on the classPath -> true
+    // pure mixin identifier not found -> (has mixins) -> false
+    // found pure mixin identifier ->
+    //   class mixins is an array and only contains the identifier -> true
+    //   otherwise -> false
+    const mixinsFilter = (classPath) => {
+      if (!ReactUtils.directlyHasMixinsField(classPath)) {
+        return true;
+      } else if (options['pure-component'] && pureRenderMixinPathAndBinding) {
+        const {binding} = pureRenderMixinPathAndBinding;
+        if (areMixinsConvertible([binding], classPath)) {
+          return true;
+        }
+      }
+      console.warn(
+        file.path + ': `' + ReactUtils.directlyGetComponentName(classPath) + '` ' +
+        'was skipped because of inconvertible mixins.'
+      );
+
+      return false;
+    };
+
+    // the only time that we can't simply replace the createClass call path
+    // with a new class is when the parent of that is a variable declaration.
+    // let's delay it and figure it out later (by looking at `path.parentPath`)
+    // in `updateToClass`.
+    const apply = (path) =>
       path
-        .filter(hasMixins)
-        .filter(callsDeprecatedAPIs)
+        .filter(mixinsFilter)
+        .filter(hasNoCallsToDeprecatedAPIs)
+        .filter(hasNoRefsToAPIsThatWillBeRemoved)
+        .filter(doesNotUseArguments)
+        .filter(isInitialStateConvertible)
         .filter(canConvertToClass)
-        .forEach(classPath => updateToClass(classPath, type));
-
-    const didTransform = (
-      apply(ReactUtils.findReactCreateClass(root), 'var')
-        .size() +
-      apply(ReactUtils.findReactCreateClassModuleExports(root), 'moduleExports')
-        .size() +
-      apply(ReactUtils.findReactCreateClassExportDefault(root), 'exportDefault')
-        .size()
-    ) > 0;
+        .forEach(updateToClass);
+
+    const didTransform = apply(
+      ReactUtils.findAllReactCreateClassCalls(root)
+    ).size() > 0;
 
     if (didTransform) {
+      // prune removed requires
+      if (pureRenderMixinPathAndBinding) {
+        const {binding, path, type} = pureRenderMixinPathAndBinding;
+        let shouldReinsertComment = false;
+        if (findUnusedVariables(path, binding).size() === 0) {
+          var removePath = null;
+          if (type === 'require') {
+            const bodyNode = path.parentPath.parentPath.parentPath.value;
+            const variableDeclarationNode = path.parentPath.parentPath.value;
+
+            removePath = path.parentPath.parentPath;
+            shouldReinsertComment = bodyNode.indexOf(variableDeclarationNode) === 0;
+          } else {
+            const importDeclarationNode = path.value;
+            const bodyNode = path.parentPath.value;
+
+            removePath = path;
+            shouldReinsertComment = bodyNode.indexOf(importDeclarationNode) === 0;
+          }
+
+          j(removePath).remove();
+          if (shouldReinsertComment) {
+            root.get().node.comments = topComments;
+          }
+        }
+      }
+
       return root.toSource(printOptions);
     }
-
   }
 
   return null;
 };
+
+module.exports.parser = 'flow';
diff --git a/transforms/sort-comp.js b/transforms/sort-comp.js
index 97af1ac4..d37eee01 100644
--- a/transforms/sort-comp.js
+++ b/transforms/sort-comp.js
@@ -36,7 +36,7 @@ module.exports = function(fileInfo, api, options) {
   const printOptions =
     options.printOptions || {quote: 'single', trailingComma: true};
 
-  const methodsOrder = getMethodsOrder(fileInfo, options);
+  const methodsOrder = getMethodsOrder(fileInfo, options); // eslint-disable-line no-use-before-define
 
   const root = j(fileInfo.source);
 
@@ -44,8 +44,8 @@ module.exports = function(fileInfo, api, options) {
     const nameA = a.key.name;
     const nameB = b.key.name;
 
-    const indexA = getCorrectIndex(methodsOrder, a);
-    const indexB = getCorrectIndex(methodsOrder, b);
+    const indexA = getCorrectIndex(methodsOrder, a); // eslint-disable-line no-use-before-define
+    const indexB = getCorrectIndex(methodsOrder, b); // eslint-disable-line no-use-before-define
 
     const sameLocation = indexA === indexB;
 
diff --git a/transforms/utils/ReactUtils.js b/transforms/utils/ReactUtils.js
index 830c6ccc..c09757a2 100644
--- a/transforms/utils/ReactUtils.js
+++ b/transforms/utils/ReactUtils.js
@@ -58,7 +58,8 @@ module.exports = function(j) {
       .filter(decl => findReactCreateClassCallExpression(decl).size() > 0);
 
   const findReactCreateClassExportDefault = path =>
-    path.find(j.ExportDefaultDeclaration, {
+    path.find(j.ExportDeclaration, {
+      default: true,
       declaration: {
         type: 'CallExpression',
         callee: REACT_CREATE_CLASS_MEMBER_EXPRESSION,
@@ -85,6 +86,18 @@ module.exports = function(j) {
         },
       });
 
+  const getReactCreateClassSpec = classPath => {
+    const {value} = classPath;
+    const args = (value.init || value.right || value.declaration).arguments;
+    if (args && args.length) {
+      const spec = args[0];
+      if (spec.type === 'ObjectExpression' && Array.isArray(spec.properties)) {
+        return spec;
+      }
+    }
+    return null;
+  };
+
   // ---------------------------------------------------------------------------
   // Finds alias for React.Component if used as named import.
   const findReactComponentName = path => {
@@ -160,18 +173,6 @@ module.exports = function(j) {
 
   // ---------------------------------------------------------------------------
   // Others
-  const getReactCreateClassSpec = classPath => {
-    const {value} = classPath;
-    const args = (value.init || value.right || value.declaration).arguments;
-    if (args) {
-      const spec = args[0];
-      if (spec.type === 'ObjectExpression' && Array.isArray(spec.properties)) {
-        return spec;
-      }
-    }
-    return null;
-  };
-
   const getClassExtendReactSpec = classPath => classPath.value.body;
 
   const createCreateReactClassCallExpression = properties =>
@@ -187,6 +188,78 @@ module.exports = function(j) {
   const getComponentName =
     classPath => classPath.node.id && classPath.node.id.name;
 
+  // ---------------------------------------------------------------------------
+  // Direct methods! (see explanation below)
+  const findAllReactCreateClassCalls = path =>
+    path.find(j.CallExpression, {
+      callee: REACT_CREATE_CLASS_MEMBER_EXPRESSION,
+    });
+
+  // Mixin Stuff
+  const containSameElements = (ls1, ls2) => {
+    if (ls1.length !== ls2.length) {
+      return false;
+    }
+
+    return (
+      ls1.reduce((res, x) => res && ls2.indexOf(x) !== -1, true) &&
+      ls2.reduce((res, x) => res && ls1.indexOf(x) !== -1, true)
+    );
+  };
+
+  const keyNameIsMixins = property => property.key.name === 'mixins';
+
+  const isSpecificMixinsProperty = (property, mixinIdentifierNames) => {
+    const key = property.key;
+    const value = property.value;
+
+    return (
+      key.name === 'mixins' &&
+      value.type === 'ArrayExpression' &&
+      Array.isArray(value.elements) &&
+      value.elements.every(elem => elem.type === 'Identifier') &&
+      containSameElements(value.elements.map(elem => elem.name), mixinIdentifierNames)
+    );
+  };
+
+  // These following methods assume that the argument is
+  // a `React.createClass` call expression. In other words,
+  // they should only be used with `findAllReactCreateClassCalls`.
+  const directlyGetCreateClassSpec = classPath => {
+    if (!classPath || !classPath.value) {
+      return null;
+    }
+    const args = classPath.value.arguments;
+    if (args && args.length) {
+      const spec = args[0];
+      if (spec.type === 'ObjectExpression' && Array.isArray(spec.properties)) {
+        return spec;
+      }
+    }
+    return null;
+  };
+
+  const directlyGetComponentName = classPath => {
+    let result = '';
+    if (
+      classPath.parentPath.value &&
+      classPath.parentPath.value.type === 'VariableDeclarator'
+    ) {
+      result = classPath.parentPath.value.id.name;
+    }
+    return result;
+  };
+
+  const directlyHasMixinsField = classPath => {
+    const spec = directlyGetCreateClassSpec(classPath);
+    return spec && spec.properties.some(keyNameIsMixins);
+  };
+
+  const directlyHasSpecificMixins = (classPath, mixinIdentifierNames) => {
+    const spec = directlyGetCreateClassSpec(classPath);
+    return spec && spec.properties.some(prop => isSpecificMixinsProperty(prop, mixinIdentifierNames));
+  };
+
   return {
     createCreateReactClassCallExpression,
     findReactES6ClassDeclaration,
@@ -201,5 +274,12 @@ module.exports = function(j) {
     hasModule,
     hasReact,
     isMixinProperty,
+
+    // "direct" methods
+    findAllReactCreateClassCalls,
+    directlyGetComponentName,
+    directlyGetCreateClassSpec,
+    directlyHasMixinsField,
+    directlyHasSpecificMixins,
   };
 };