Merge pull request jsx-eslint#890 from kentor/forbid-elements

Add forbid-elements rule

Author: lencioni

README.md

@@ -82,6 +82,7 @@ Finally, enable all of the rules that you would like to use.  Use [our preset](#
 
 * [react/display-name](docs/rules/display-name.md): Prevent missing `displayName` in a React component definition
 * [react/forbid-component-props](docs/rules/forbid-component-props.md): Forbid certain props on Components
+* [react/forbid-elements](docs/rules/forbid-elements.md): Forbid certain elements
 * [react/forbid-prop-types](docs/rules/forbid-prop-types.md): Forbid certain propTypes
 * [react/forbid-foreign-prop-types](docs/rules/forbid-foreign-prop-types.md): Forbid foreign propTypes
 * [react/no-array-index-key](docs/rules/no-array-index-key.md): Prevent using Array index in `key` props

docs/rules/forbid-elements.md

@@ -0,0 +1,58 @@
+# Forbid certain elements (forbid-elements)
+
+You may want to forbid usage of certain elements in favor of others, (e.g. forbid all `<div />` and use `<Box />` instead). This rule allows you to configure a list of forbidden elements and to specify their desired replacements.
+
+## Rule Details
+
+This rule checks all JSX elements and `React.createElement` calls and verifies that no forbidden elements are used. This rule is off by default. If on, no elements are forbidden by default.
+
+## Rule Options
+
+```js
+...
+"forbid-elements": [<enabled>, { "forbid": [<string|object>] }]
+...
+```
+
+### `forbid`
+
+An array of strings and/or objects. An object in this array may have the following properties: 
+
+* `element` (required): the name of the forbidden element (e.g. `'button'`, `'Modal'`)
+* `message`: additional message that gets reported
+
+A string item in the array is a shorthand for `{ element: string }`. 
+
+The following patterns are not considered warnings:
+
+```jsx
+// [1, { "forbid": ["button"] }]
+<Button />
+
+// [1, { "forbid": [{ "element": "button" }] }]
+<Button />
+```
+
+The following patterns are considered warnings:
+
+```jsx
+// [1, { "forbid": ["button"] }]
+<button />
+React.createElement('button');
+
+// [1, { "forbid": ["Modal"] }]
+<Modal />
+React.createElement(Modal);
+
+// [1, { "forbid": ["Namespaced.Element"] }]
+<Namespaced.Element />
+React.createElement(Namespaced.Element);
+
+// [1, { "forbid": [{ "element": "button", "message": "use <Button> instead" }, "input"] }]
+<div><button /><input /></div>
+React.createElement('div', {}, React.createElemet('button', {}, React.createElement('input')));
+```
+
+## When not to use
+
+If you don't want to forbid any elements.

index.js

@@ -42,6 +42,7 @@ var allRules = {
   'jsx-space-before-closing': require('./lib/rules/jsx-space-before-closing'),
   'no-direct-mutation-state': require('./lib/rules/no-direct-mutation-state'),
   'forbid-component-props': require('./lib/rules/forbid-component-props'),
+  'forbid-elements': require('./lib/rules/forbid-elements'),
   'forbid-prop-types': require('./lib/rules/forbid-prop-types'),
   'forbid-foreign-prop-types': require('./lib/rules/forbid-foreign-prop-types'),
   'prefer-es6-class': require('./lib/rules/prefer-es6-class'),

lib/rules/forbid-elements.js

@@ -0,0 +1,112 @@
+/**
+ * @fileoverview Forbid certain elements
+ * @author Kenneth Chung
+ */
+'use strict';
+
+var has = require('has');
+
+// ------------------------------------------------------------------------------
+// Rule Definition
+// ------------------------------------------------------------------------------
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Forbid certain elements',
+      category: 'Best Practices',
+      recommended: false
+    },
+
+    schema: [{
+      type: 'object',
+      properties: {
+        forbid: {
+          type: 'array',
+          items: {
+            anyOf: [
+              {type: 'string'},
+              {
+                type: 'object',
+                properties: {
+                  element: {type: 'string'},
+                  message: {type: 'string'}
+                },
+                required: ['element'],
+                additionalProperties: false
+              }
+            ]
+          }
+        }
+      },
+      additionalProperties: false
+    }]
+  },
+
+  create: function(context) {
+    var sourceCode = context.getSourceCode();
+    var configuration = context.options[0] || {};
+    var forbidConfiguration = configuration.forbid || [];
+
+    var indexedForbidConfigs = {};
+
+    forbidConfiguration.forEach(function(item) {
+      if (typeof item === 'string') {
+        indexedForbidConfigs[item] = {element: item};
+      } else {
+        indexedForbidConfigs[item.element] = item;
+      }
+    });
+
+    function errorMessageForElement(name) {
+      var message = '<' + name + '> is forbidden';
+      var additionalMessage = indexedForbidConfigs[name].message;
+
+      if (additionalMessage) {
+        message = message + ', ' + additionalMessage;
+      }
+
+      return message;
+    }
+
+    function isValidCreateElement(node) {
+      return node.callee
+        && node.callee.type === 'MemberExpression'
+        && node.callee.object.name === 'React'
+        && node.callee.property.name === 'createElement'
+        && node.arguments.length > 0;
+    }
+
+    function reportIfForbidden(element, node) {
+      if (has(indexedForbidConfigs, element)) {
+        context.report({
+          node: node,
+          message: errorMessageForElement(element)
+        });
+      }
+    }
+
+    return {
+      JSXOpeningElement: function(node) {
+        reportIfForbidden(sourceCode.getText(node.name), node.name);
+      },
+
+      CallExpression: function(node) {
+        if (!isValidCreateElement(node)) {
+          return;
+        }
+
+        var argument = node.arguments[0];
+        var argType = argument.type;
+
+        if (argType === 'Identifier' && /^[A-Z_]/.test(argument.name)) {
+          reportIfForbidden(argument.name, argument);
+        } else if (argType === 'Literal' && /^[a-z][^\.]*$/.test(argument.value)) {
+          reportIfForbidden(argument.value, argument);
+        } else if (argType === 'MemberExpression') {
+          reportIfForbidden(sourceCode.getText(argument), argument);
+        }
+      }
+    };
+  }
+};