Get wct-mocha compiling clean.

packages/wct-mocha/src/childrunner.ts

@@ -32,9 +32,9 @@ export default class ChildRunner {
   private container?: HTMLDivElement;
   private eventListenersToRemoveOnClean: EventListenerDescriptor[] = [];
   private iframe?: HTMLIFrameElement;
-  private onRunComplete: (error?: {}) => void;
-  private share: SharedState;
-  private state: 'initializing'|'loading'|'complete';
+  private onRunComplete: ((error?: {}) => void)|null = null;
+  share: SharedState|null = null;
+  state: 'initializing'|'loading'|'complete';
   private timeoutId?: number;
   private url: string;
 
@@ -88,7 +88,7 @@ export default class ChildRunner {
    * @return {ChildRunner} The `ChildRunner` that was registered for this
    * window.
    */
-  static current(): ChildRunner {
+  static current(): ChildRunner|null {
     return ChildRunner.get(window);
   }
 
@@ -97,7 +97,7 @@ export default class ChildRunner {
    * @param {boolean} traversal Whether this is a traversal from a child window.
    * @return {ChildRunner} The `ChildRunner` that was registered for `target`.
    */
-  static get(target: Window, traversal?: boolean): ChildRunner {
+  static get(target: Window, traversal?: boolean): ChildRunner|null {
     const childRunner = ChildRunner.byUrl[target.location.href];
     if (childRunner) {
       return childRunner;
@@ -154,7 +154,7 @@ export default class ChildRunner {
         () => this.loaded(new Error('Failed to load document ' + this.url)),
         iframe);
     this.addEventListener(
-        'DOMContentLoaded', () => this.loaded(), iframe.contentWindow);
+        'DOMContentLoaded', () => this.loaded(), iframe.contentWindow!);
   }
 
   /**
@@ -165,15 +165,15 @@ export default class ChildRunner {
   loaded(error?: {}) {
     util.debug('ChildRunner#loaded', this.url, error);
 
-    if (this.iframe.contentWindow == null && error) {
+    if (!this.iframe || this.iframe.contentWindow == null && error) {
       this.signalRunComplete(error);
       this.done();
       return;
     }
 
     // Not all targets have WCT loaded (compatiblity mode)
-    if (this.iframe.contentWindow.WCT) {
-      this.share = this.iframe.contentWindow.WCT.share;
+    if (this.iframe.contentWindow!.WCT) {
+      this.share = this.iframe.contentWindow!.WCT.share;
     }
 
     if (error) {
@@ -215,7 +215,7 @@ export default class ChildRunner {
       setTimeout(() => {
         this.removeAllEventListeners();
 
-        this.container.removeChild(this.iframe as Node);
+        this.container!.removeChild(this.iframe as Node);
         this.iframe = undefined;
         this.share = null;
       }, 0);

packages/wct-mocha/src/clisocket.ts

@@ -98,7 +98,7 @@ export default class CLISocket {
    *
    * @param {function(*, CLISocket)} done Node-style callback.
    */
-  static init(done: (error?: {}, socket?: CLISocket) => void) {
+  static init(done: (error?: {}|null|undefined, socket?: CLISocket) => void) {
     const browserId = util.getParam('cli_browser_id');
     if (!browserId) {
       return done();
@@ -108,7 +108,7 @@ export default class CLISocket {
       return done();
     }
 
-    util.loadScript(SOCKETIO_LIBRARY, (error: {}) => {
+    util.loadScript(SOCKETIO_LIBRARY, (error: {}|undefined|null) => {
       if (error) {
         return done(error);
       }
@@ -139,7 +139,7 @@ export default class CLISocket {
  * @return {!Array.<string>} The titles of the runnable and its parents.
  */
 function getTitles(runnable: Mocha.IRunnable) {
-  const titles = [];
+  const titles: string[] = [];
   while (runnable && !runnable.root && runnable.title) {
     titles.unshift(runnable.title);
     runnable = runnable.parent as {} as Mocha.IRunnable;

packages/wct-mocha/src/config.ts

@@ -76,7 +76,7 @@ export function setup(options: Partial<Config>) {
     const wctMochaJsRoot = util.scriptPrefix('wct-mocha.js');
     const browserJsRoot = util.scriptPrefix('browser.js');
     const scriptName = wctMochaJsRoot ? 'wct-mocha.js' : 'browser.js';
-    const root = wctMochaJsRoot || browserJsRoot;
+    const root = (wctMochaJsRoot || browserJsRoot)!;
     _config.root = util.basePath(root.substr(0, root.length - 1));
     if (!_config.root) {
       throw new Error(
@@ -93,11 +93,13 @@ export function get<K extends keyof Config>(key: K): Config[K] {
   return _config[key];
 }
 
-export function deepMerge(target: Partial<Config>, source: Partial<Config>) {
-  Object.keys(source).forEach((key) => {
-    if (target[key] !== null && typeof target[key] === 'object' &&
-        !Array.isArray(target[key])) {
-      deepMerge(target[key], source[key]);
+export function deepMerge<V extends {}>(target: V, source: V) {
+  Object.keys(source).forEach((untypedKey) => {
+    const key = untypedKey as keyof typeof source;
+    const targetValue = target[key];
+    if (targetValue != null && typeof targetValue === 'object' &&
+        !Array.isArray(targetValue)) {
+      deepMerge(targetValue, source[key]);
     } else {
       target[key] = source[key];
     }

packages/wct-mocha/src/environment.ts

@@ -30,15 +30,15 @@ export function loadSync() {
     scripts.push(a11ySuiteScriptPath);
   }
   scripts.forEach((path) => {
-    const url = util.expandUrl(path, config.get('root'));
+    const url = util.expandUrl(path, config.get('root')!);
     util.debug('Loading environment script:', url);
     // Synchronous load.
     document.write(`<script src="${encodeURI(url)}"></script>`);
   });
   util.debug('Environment scripts loaded');
   const imports = config.get('environmentImports');
   imports.forEach((path) => {
-    const url = util.expandUrl(path, config.get('root'));
+    const url = util.expandUrl(path, config.get('root')!);
     util.debug('Loading environment import:', url);
     // Synchronous load.
     document.write(`<link rel="import" href="${encodeURI(url)}">`);

packages/wct-mocha/src/environment/helpers.ts

@@ -132,7 +132,7 @@ export function flush(callback: () => void) {
   } else if (window.WebComponents && window.WebComponents.flush) {
     scope = window.WebComponents;
   }
-  if (scope) {
+  if (scope && scope.flush) {
     scope.flush();
   }
 

packages/wct-mocha/src/index.ts

@@ -58,7 +58,7 @@ export function initialize(initConfig?: config.Config) {
     // Until then, we get to rely on it to expose parent runners to their
     // children.
     _ChildRunner: ChildRunner,
-    _reporter: undefined as MultiReporter,  // assigned below
+    _reporter: undefined! as MultiReporter,  // assigned below
     _config: config._config,
 
     // Public API

packages/wct-mocha/src/mocha/extend.ts

@@ -28,7 +28,10 @@ export function extendInterfaces(
   interfaceExtensions.push(() => {
     const Mocha = window.Mocha;
     // For all Mocha interfaces (probably just TDD and BDD):
-    Object.keys(Mocha.interfaces).forEach((interfaceName: 'tdd'|'bdd') => {
+    Object.keys(Mocha.interfaces).forEach((interfaceName: string) => {
+      if (interfaceName !== 'tdd' && interfaceName !== 'bdd') {
+        return;
+      }
       // This is the original callback that defines the interface (TDD or
       // BDD):
       const originalInterface = Mocha.interfaces[interfaceName];
@@ -44,16 +47,22 @@ export function extendInterfaces(
         originalInterface.apply(this, arguments);
         // Register a listener so that we can further extend the base
         // interface:
-        suite.on('pre-require', (context: {}, _file: string, _mocha: {}) => {
-          // Capture a bound reference to the teardown function as a
-          // convenience:
-          const teardown = context[teardownProperty].bind(context);
-          // Add our new helper to the testing context. The helper is
-          // generated by a factory method that receives the context,
-          // the teardown function and the interface name and returns
-          // the new method to be added to that context:
-          context[helperName] = helperFactory(context, teardown, interfaceName);
-        });
+        suite.on(
+            'pre-require',
+            (context: {teardown: Function, afterEach: Function},
+             _file: string,
+             _mocha: {}) => {
+              // Capture a bound reference to the teardown function as a
+              // convenience:
+              const teardown = context[teardownProperty].bind(context);
+              // Add our new helper to the testing context. The helper is
+              // generated by a factory method that receives the context,
+              // the teardown function and the interface name and returns
+              // the new method to be added to that context:
+              // tslint:disable-next-line:no-any
+              (context as any)[helperName] =
+                  helperFactory(context, teardown, interfaceName);
+            });
       };
     });
   });

packages/wct-mocha/src/reporters.ts

@@ -24,10 +24,10 @@ export let jsSuites: Array<undefined> = [];
  * @return {!Array.<!Mocha.reporters.Base} The reporters that should be used.
  */
 export function determineReporters(
-    socket: CLISocket, parent: MultiReporter): ReporterFactory[] {
+    socket: CLISocket, parent: MultiReporter|null): ReporterFactory[] {
   // Parents are greedy.
   if (parent) {
-    return [parent.childReporter(window.location)];
+    return [parent.childReporter()];
   }
 
   // Otherwise, we get to run wild without any parental supervision!

packages/wct-mocha/src/reporters/console.ts

@@ -34,18 +34,25 @@ const CAN_STYLE_GROUP = userAgent.match('webkit');
 // Track the indent for faked `console.group`
 let logIndent = '';
 
+function getStyle(style?: keyof typeof STYLES): string {
+  if (style === undefined) {
+    return STYLES.plain;
+  }
+  return STYLES[style] || STYLES.plain;
+}
+
 function log(text: string, style?: keyof typeof STYLES) {
   text = text.split('\n').map((l) => logIndent + l).join('\n');
   if (CAN_STYLE_LOG) {
-    console.log('%c' + text, STYLES[style] || STYLES.plain);
+    console.log('%c' + text, getStyle(style));
   } else {
     console.log(text);
   }
 }
 
 function logGroup(text: string, style?: keyof typeof STYLES) {
   if (CAN_STYLE_GROUP) {
-    console.group('%c' + text, STYLES[style] || STYLES.plain);
+    console.group('%c' + text, getStyle(style));
   } else if (console.group) {
     console.group(text);
   } else {

packages/wct-mocha/src/reporters/html.ts

@@ -14,12 +14,12 @@
  *
  * @param {!Mocha.Runner} runner The runner that is being reported on.
  */
-export default function HTML(runner: Mocha.IRunner) {
+export default function HTML(this: Mocha.IRunner, runner: Mocha.IRunner) {
   const output = document.createElement('div');
   output.id = 'mocha';
   document.body.appendChild(output);
 
-  runner.on('suite', function(_test: {}) {
+  runner.on('suite', function(this: Mocha.IRunner, _test: {}) {
     this.total = runner.total;
   }.bind(this));
 
@@ -67,4 +67,4 @@ style.textContent = `
       color: #555 !important;
     }
 `;
-document.head.appendChild(style);
+document.head!.appendChild(style);

packages/wct-mocha/src/reporters/multi.ts

@@ -48,16 +48,16 @@ export interface ReporterFactory {
 }
 
 interface ExtendedTest extends Mocha.ITest {
-  err: {};
+  err: {}|undefined;
 }
 
 /**
  * A Mocha-like reporter that combines the output of multiple Mocha suites.
  */
 export default class MultiReporter implements Reporter {
-  private readonly reporters: ReadonlyArray<Reporter>;
-  private readonly parent: MultiReporter|undefined;
-  private readonly basePath: string;
+  readonly reporters: ReadonlyArray<Reporter>;
+  readonly parent: MultiReporter|undefined|null;
+  readonly basePath: string;
   total: number;
   private currentRunner: null|Mocha.IRunner;
   /** Arguments that would be called on emit(). */
@@ -73,7 +73,7 @@ export default class MultiReporter implements Reporter {
    */
   constructor(
       numSuites: number, reporters: ReporterFactory[],
-      parent: MultiReporter|undefined) {
+      parent: MultiReporter|undefined|null) {
     this.reporters = reporters.map((reporter) => {
       return new reporter(this);
     });
@@ -92,12 +92,10 @@ export default class MultiReporter implements Reporter {
   }
 
   /**
-   * @param location The location this reporter represents.
    * @return A reporter-like "class" for each child suite
    *     that should be passed to `mocha.run`.
    */
-  childReporter(location: Location|string): ReporterFactory {
-    const name = this.suiteTitle(location);
+  childReporter(): ReporterFactory {
     // The reporter is used as a constructor, so we can't depend on `this` being
     // properly bound.
     const self = this;

packages/wct-mocha/src/reporters/title.ts

@@ -20,7 +20,6 @@ const ARC_WIDTH = 6;
  * @param {!Mocha.Runner} runner The runner that is being reported on.
  */
 export default class Title {
-  runner: Mocha.Runner;
   constructor(runner: Mocha.IRunner) {
     Mocha.reporters.Base.call(this, runner);
 
@@ -46,7 +45,7 @@ export default class Title {
   updateFavicon() {
     const canvas = document.createElement('canvas');
     canvas.height = canvas.width = 32;
-    const context = canvas.getContext('2d');
+    const context = canvas.getContext('2d')!;
 
     const passing = this.stats.passes;
     const pending = this.stats.pending;
@@ -61,17 +60,17 @@ export default class Title {
 
   /** Sets the current favicon by URL. */
   setFavicon(url: string) {
-    const current = document.head.querySelector('link[rel="icon"]');
+    const current = document.head!.querySelector('link[rel="icon"]');
     if (current) {
-      document.head.removeChild(current as Node);
+      document.head!.removeChild(current as Node);
     }
 
     const link = document.createElement('link');
     link.rel = 'icon';
     link.type = 'image/x-icon';
     link.href = url;
     link.setAttribute('sizes', '32x32');
-    document.head.appendChild(link);
+    document.head!.appendChild(link);
   }
 }