diff --git a/README.md b/README.md
index 60c02598659..f6495db98a6 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,18 @@ gulp --tasks
 
 ## Testing the SDK
 
-To run all tests for the SDK simply run: `npm test` at the root of this package. 
+To run all tests for the SDK you must first supply a firebase project config for 
+your tests. This is done by creating a file called `project.json` and at the 
+following path:
+
+```
+tests/config/project.json
+```
+
+This file should contain a JSON object with your app information (i.e. the same
+information you would pass to `firebase.initializeApp`).
+
+After you have done this, simply run: `npm test` at the root of this package.
 
 There are several types of available tests:
 
diff --git a/package.json b/package.json
index 1c936adca3f..b3a9d46a3c7 100644
--- a/package.json
+++ b/package.json
@@ -68,7 +68,7 @@
     "karma-firefox-launcher": "^1.0.1",
     "karma-mocha": "^1.3.0",
     "karma-spec-reporter": "^0.0.30",
-    "karma-typescript": "^3.0.1",
+    "karma-typescript": "^3.0.4",
     "merge2": "^1.0.3",
     "mkdirp": "^0.5.1",
     "require-dir": "^0.3.1",
@@ -76,8 +76,8 @@
     "shx": "^0.2.2",
     "sinon": "^2.1.0",
     "through2": "^2.0.3",
-    "ts-node": "2.1.1",
-    "typescript": "^2.2.1",
+    "ts-node": "^3.3.0",
+    "typescript": "^2.4.2",
     "validate-commit-msg": "^2.12.1",
     "vinyl-named": "^1.1.0",
     "webpack": "^3.0.0",
diff --git a/src/messaging/controllers/window-controller.ts b/src/messaging/controllers/window-controller.ts
index 9023065e4d3..fa2721ebb8c 100644
--- a/src/messaging/controllers/window-controller.ts
+++ b/src/messaging/controllers/window-controller.ts
@@ -247,7 +247,7 @@ export default class WindowController extends ControllerInterface {
     const serviceWorker = registration.installing || registration.waiting ||
       registration.active;
 
-    return new Promise((resolve, reject) => {
+    return new Promise<ServiceWorkerRegistration>((resolve, reject) => {
       if (!serviceWorker) {
         // This is a rare scenario but has occured in firefox
         reject(this.errorFactory_.create(Errors.codes.NO_SW_IN_REG));
diff --git a/src/messaging/models/db-interface.ts b/src/messaging/models/db-interface.ts
index 9832eebb635..58044514393 100644
--- a/src/messaging/models/db-interface.ts
+++ b/src/messaging/models/db-interface.ts
@@ -25,7 +25,7 @@ export default class DBInterface {
   private dbVersion_: number;
   private openDbPromise_: Promise<IDBDatabase>;
   protected errorFactory_: ErrorFactory<string>;
-  protected TRANSACTION_READ_WRITE: string;
+  protected TRANSACTION_READ_WRITE: IDBTransactionMode;
 
   /**
    * @param {string} dbName
diff --git a/src/storage/task.ts b/src/storage/task.ts
index 6ea29692a32..2d084acb485 100644
--- a/src/storage/task.ts
+++ b/src/storage/task.ts
@@ -493,13 +493,15 @@ export class UploadTask {
   /**
    * This object behaves like a Promise, and resolves with its snapshot data
    * when the upload completes.
-   *     The fulfillment callback. Promise chaining works as normal.
+   * @param onFulfilled The fulfillment callback. Promise chaining works as normal.
    * @param onRejected The rejection callback.
    */
   then<U>(onFulfilled?: ((value: UploadTaskSnapshot) => U | PromiseLike<U>) | null, onRejected?: ((error: any) => U | PromiseLike<U>) | null): Promise<U> {
+      // These casts are needed so that TypeScript can infer the types of the
+      // resulting Promise.
       return this.promise_.then<U>(
         (onFulfilled as (value: UploadTaskSnapshot) => U | PromiseLike<U>),
-        (onRejected as ((error: any) => PromiseLike<U>) | null));
+        (onRejected as ((error: any) => PromiseLike<never>) | null));
   }
 
   /**
diff --git a/yarn.lock b/yarn.lock
index d501fd7c7eb..d163cbfe3e7 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -152,6 +152,12 @@ ansi-styles@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
 
+ansi-styles@^3.1.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.0.tgz#c159b8d5be0f9e5a6f346dab94f16ce022161b88"
+  dependencies:
+    color-convert "^1.9.0"
+
 anymatch@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/anymatch/-/anymatch-1.3.0.tgz#a3e52fa39168c825ff57b0248126ce5a8ff95507"
@@ -1335,6 +1341,14 @@ chalk@^1.0.0, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
     strip-ansi "^3.0.0"
     supports-color "^2.0.0"
 
+chalk@^2.0.0:
+  version "2.0.1"
+  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.0.1.tgz#dbec49436d2ae15f536114e76d14656cdbc0f44d"
+  dependencies:
+    ansi-styles "^3.1.0"
+    escape-string-regexp "^1.0.5"
+    supports-color "^4.0.0"
+
 child-process-promise@^2.2.1:
   version "2.2.1"
   resolved "https://registry.yarnpkg.com/child-process-promise/-/child-process-promise-2.2.1.tgz#4730a11ef610fad450b8f223c79d31d7bdad8074"
@@ -1453,6 +1467,16 @@ collection-visit@^0.2.1:
     map-visit "^0.1.5"
     object-visit "^0.3.4"
 
+color-convert@^1.9.0:
+  version "1.9.0"
+  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.0.tgz#1accf97dd739b983bf994d56fec8f95853641b7a"
+  dependencies:
+    color-name "^1.1.1"
+
+color-name@^1.1.1:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
+
 colors@1.0.x:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/colors/-/colors-1.0.3.tgz#0433f44d809680fdeb60ed260f1b0c262e82a40b"
@@ -3119,6 +3143,10 @@ has-flag@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-1.0.0.tgz#9d9e793165ce017a00f00418c43f942a7b1d11fa"
 
+has-flag@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/has-flag/-/has-flag-2.0.0.tgz#e8207af1cc7b30d446cc70b734b5e8be18f88d51"
+
 has-gulplog@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/has-gulplog/-/has-gulplog-0.1.0.tgz#6414c82913697da51590397dafb12f22967811ce"
@@ -3774,9 +3802,9 @@ karma-spec-reporter@^0.0.30:
   dependencies:
     colors "^1.1.2"
 
-karma-typescript@^3.0.1:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/karma-typescript/-/karma-typescript-3.0.1.tgz#64619473a68973773ec3132f96be06da7428427e"
+karma-typescript@^3.0.4:
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/karma-typescript/-/karma-typescript-3.0.4.tgz#9cdeeeddd1671693440c34ec62aba2d6ff9e4b05"
   dependencies:
     acorn "^4.0.4"
     amdefine "1.0.0"
@@ -5066,7 +5094,7 @@ pinkie-promise@^2.0.0:
   dependencies:
     pinkie "^2.0.0"
 
-pinkie@^2.0.0, pinkie@^2.0.4:
+pinkie@^2.0.0:
   version "2.0.4"
   resolved "https://registry.yarnpkg.com/pinkie/-/pinkie-2.0.4.tgz#72556b80cfa0d48a974e80e77248e80ed4f7f870"
 
@@ -5998,6 +6026,12 @@ supports-color@^3.1.0:
   dependencies:
     has-flag "^1.0.0"
 
+supports-color@^4.0.0:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-4.2.1.tgz#65a4bb2631e90e02420dba5554c375a4754bb836"
+  dependencies:
+    has-flag "^2.0.0"
+
 symbol-tree@^3.2.1:
   version "3.2.2"
   resolved "https://registry.yarnpkg.com/symbol-tree/-/symbol-tree-3.2.2.tgz#ae27db38f660a7ae2e1c3b7d1bc290819b8519e6"
@@ -6222,22 +6256,20 @@ trim-right@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/trim-right/-/trim-right-1.0.1.tgz#cb2e1203067e0c8de1f614094b9fe45704ea6003"
 
-ts-node@2.1.1:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-2.1.1.tgz#2fe7049ea56319730052a9e677985e6151a7bd31"
+ts-node@^3.3.0:
+  version "3.3.0"
+  resolved "https://registry.yarnpkg.com/ts-node/-/ts-node-3.3.0.tgz#c13c6a3024e30be1180dd53038fc209289d4bf69"
   dependencies:
     arrify "^1.0.0"
-    chalk "^1.1.1"
+    chalk "^2.0.0"
     diff "^3.1.0"
     make-error "^1.1.1"
     minimist "^1.2.0"
     mkdirp "^0.5.1"
-    pinkie "^2.0.4"
     source-map-support "^0.4.0"
     tsconfig "^6.0.0"
-    v8flags "^2.0.11"
-    xtend "^4.0.0"
-    yn "^1.2.0"
+    v8flags "^3.0.0"
+    yn "^2.0.0"
 
 tsconfig@^6.0.0:
   version "6.0.0"
@@ -6289,9 +6321,9 @@ typedarray@~0.0.5:
   version "0.0.6"
   resolved "https://registry.yarnpkg.com/typedarray/-/typedarray-0.0.6.tgz#867ac74e3864187b1d3d47d996a78ec5c8830777"
 
-typescript@^2.2.1:
-  version "2.3.2"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.3.2.tgz#f0f045e196f69a72f06b25fd3bd39d01c3ce9984"
+typescript@^2.4.2:
+  version "2.4.2"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-2.4.2.tgz#f8395f85d459276067c988aa41837a8f82870844"
 
 uglify-js@^2.6, uglify-js@^2.8.29:
   version "2.8.29"
@@ -6460,12 +6492,18 @@ uuid@^3.0.0:
   version "3.0.1"
   resolved "https://registry.yarnpkg.com/uuid/-/uuid-3.0.1.tgz#6544bba2dfda8c1cf17e629a3a305e2bb1fee6c1"
 
-v8flags@^2.0.10, v8flags@^2.0.11, v8flags@^2.0.9:
+v8flags@^2.0.10, v8flags@^2.0.9:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/v8flags/-/v8flags-2.1.1.tgz#aab1a1fa30d45f88dd321148875ac02c0b55e5b4"
   dependencies:
     user-home "^1.1.1"
 
+v8flags@^3.0.0:
+  version "3.0.0"
+  resolved "https://registry.yarnpkg.com/v8flags/-/v8flags-3.0.0.tgz#4be9604488e0c4123645def705b1848d16b8e01f"
+  dependencies:
+    user-home "^1.1.1"
+
 vali-date@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/vali-date/-/vali-date-1.0.0.tgz#1b904a59609fb328ef078138420934f6b86709a6"
@@ -6873,6 +6911,6 @@ yeast@0.1.2:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/yeast/-/yeast-0.1.2.tgz#008e06d8094320c372dbc2f8ed76a0ca6c8ac419"
 
-yn@^1.2.0:
-  version "1.2.0"
-  resolved "https://registry.yarnpkg.com/yn/-/yn-1.2.0.tgz#d237a4c533f279b2b89d3acac2db4b8c795e4a63"
+yn@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/yn/-/yn-2.0.0.tgz#e5adabc8acf408f6385fc76495684c88e6af689a"