refactor(core): ensure compatibility with typescript strict flag (#30993)

As part of FW-1265, the `@angular/core` package is made compatible
with the TypeScript `--strict` flag. This already unveiled a few bugs,
so the strictness flag seems to help with increasing the overall code health.

Read more about the strict flag [here](https://www.typescriptlang.org/docs/handbook/compiler-options.html)

PR Close #30993

packages/BUILD.bazel

@@ -23,6 +23,12 @@ ts_config(
     deps = [":tsconfig-build.json"],
 )
 
+ts_config(
+    name = "tsconfig-build-no-strict",
+    src = "tsconfig-build-no-strict.json",
+    deps = [":tsconfig-build.json"],
+)
+
 exports_files([
     "license-banner.txt",
     "README.md",

packages/core/src/debug/debug_node.ts

@@ -440,9 +440,15 @@ class DebugElement__POST_R3__ extends DebugNode__POST_R3__ implements DebugEleme
  * @param matches the list of positive matches
  * @param elementsOnly whether only elements should be searched
  */
+function _queryAllR3(
+    parentElement: DebugElement, predicate: Predicate<DebugElement>, matches: DebugElement[],
+    elementsOnly: true): void;
 function _queryAllR3(
     parentElement: DebugElement, predicate: Predicate<DebugNode>, matches: DebugNode[],
-    elementsOnly: boolean) {
+    elementsOnly: false): void;
+function _queryAllR3(
+    parentElement: DebugElement, predicate: Predicate<DebugElement>| Predicate<DebugNode>,
+    matches: DebugElement[] | DebugNode[], elementsOnly: boolean) {
   const context = loadLContext(parentElement.nativeNode) !;
   const parentTNode = context.lView[TVIEW].data[context.nodeIndex] as TNode;
   _queryNodeChildrenR3(
@@ -457,11 +463,11 @@ function _queryAllR3(
  * @param predicate the predicate to match
  * @param matches the list of positive matches
  * @param elementsOnly whether only elements should be searched
- * @param rootNativeNode the root native node on which prediccate shouold not be matched
+ * @param rootNativeNode the root native node on which predicate should not be matched
  */
 function _queryNodeChildrenR3(
-    tNode: TNode, lView: LView, predicate: Predicate<DebugNode>, matches: DebugNode[],
-    elementsOnly: boolean, rootNativeNode: any) {
+    tNode: TNode, lView: LView, predicate: Predicate<DebugElement>| Predicate<DebugNode>,
+    matches: DebugElement[] | DebugNode[], elementsOnly: boolean, rootNativeNode: any) {
   const nativeNode = getNativeByTNode(tNode, lView);
   // For each type of TNode, specific logic is executed.
   if (tNode.type === TNodeType.Element || tNode.type === TNodeType.ElementContainer) {
@@ -535,11 +541,11 @@ function _queryNodeChildrenR3(
  * @param predicate the predicate to match
  * @param matches the list of positive matches
  * @param elementsOnly whether only elements should be searched
- * @param rootNativeNode the root native node on which prediccate shouold not be matched
+ * @param rootNativeNode the root native node on which predicate should not be matched
  */
 function _queryNodeChildrenInContainerR3(
-    lContainer: LContainer, predicate: Predicate<DebugNode>, matches: DebugNode[],
-    elementsOnly: boolean, rootNativeNode: any) {
+    lContainer: LContainer, predicate: Predicate<DebugElement>| Predicate<DebugNode>,
+    matches: DebugElement[] | DebugNode[], elementsOnly: boolean, rootNativeNode: any) {
   for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {
     const childView = lContainer[i];
     _queryNodeChildrenR3(
@@ -554,16 +560,23 @@ function _queryNodeChildrenInContainerR3(
  * @param predicate the predicate to match
  * @param matches the list of positive matches
  * @param elementsOnly whether only elements should be searched
- * @param rootNativeNode the root native node on which prediccate shouold not be matched
+ * @param rootNativeNode the root native node on which predicate should not be matched
  */
 function _addQueryMatchR3(
-    nativeNode: any, predicate: Predicate<DebugNode>, matches: DebugNode[], elementsOnly: boolean,
-    rootNativeNode: any) {
+    nativeNode: any, predicate: Predicate<DebugElement>| Predicate<DebugNode>,
+    matches: DebugElement[] | DebugNode[], elementsOnly: boolean, rootNativeNode: any) {
   if (rootNativeNode !== nativeNode) {
     const debugNode = getDebugNode(nativeNode);
-    if (debugNode && (elementsOnly ? debugNode instanceof DebugElement__POST_R3__ : true) &&
-        predicate(debugNode)) {
+    if (!debugNode) {
+      return;
+    }
+    // Type of the "predicate and "matches" array are set based on the value of
+    // the "elementsOnly" parameter. TypeScript is not able to properly infer these
+    // types with generics, so we manually cast the parameters accordingly.
+    if (elementsOnly && debugNode instanceof DebugElement__POST_R3__ && predicate(debugNode)) {
       matches.push(debugNode);
+    } else if (!elementsOnly && (predicate as Predicate<DebugNode>)(debugNode)) {
+      (matches as DebugNode[]).push(debugNode);
     }
   }
 }

packages/core/src/di/injectable.ts

@@ -92,10 +92,10 @@ export interface InjectableType<T> extends Type<T> { ngInjectableDef: ɵɵInject
  * Supports @Injectable() in JIT mode for Render2.
  */
 function render2CompileInjectable(
-    injectableType: InjectableType<any>,
-    options: {providedIn?: Type<any>| 'root' | null} & InjectableProvider): void {
+    injectableType: Type<any>,
+    options?: {providedIn?: Type<any>| 'root' | null} & InjectableProvider): void {
   if (options && options.providedIn !== undefined && !getInjectableDef(injectableType)) {
-    injectableType.ngInjectableDef = ɵɵdefineInjectable({
+    (injectableType as InjectableType<any>).ngInjectableDef = ɵɵdefineInjectable({
       token: injectableType,
       providedIn: options.providedIn,
       factory: convertInjectableProviderToFactory(injectableType, options),

packages/core/src/di/injector_compatibility.ts

@@ -68,8 +68,8 @@ export function setCurrentInjector(injector: Injector | null | undefined): Injec
  *  1. `Injector` should not depend on ivy logic.
  *  2. To maintain tree shake-ability we don't want to bring in unnecessary code.
  */
-let _injectImplementation: (<T>(token: Type<T>| InjectionToken<T>, flags: InjectFlags) => T | null)|
-    undefined;
+let _injectImplementation:
+    (<T>(token: Type<T>| InjectionToken<T>, flags?: InjectFlags) => T | null)|undefined;
 
 /**
  * Sets the current inject implementation.

packages/core/src/di/reflective_provider.ts

@@ -180,10 +180,11 @@ export function mergeResolvedReflectiveProviders(
   return normalizedProvidersMap;
 }
 
-function _normalizeProviders(providers: Provider[], res: Provider[]): Provider[] {
+function _normalizeProviders(
+    providers: Provider[], res: NormalizedProvider[]): NormalizedProvider[] {
   providers.forEach(b => {
     if (b instanceof Type) {
-      res.push({provide: b, useClass: b});
+      res.push({ provide: b, useClass: b } as NormalizedProvider);
 
     } else if (b && typeof b == 'object' && (b as any).provide !== undefined) {
       res.push(b as NormalizedProvider);

packages/core/src/linker/ng_module_factory_registration.ts

@@ -50,7 +50,7 @@ export function registerNgModuleType(ngModuleType: NgModuleType) {
     imports = imports();
   }
   if (imports) {
-    imports.forEach((i: NgModuleType<any>) => registerNgModuleType(i));
+    imports.forEach(i => registerNgModuleType(i as NgModuleType));
   }
 }
 

packages/core/src/metadata/ng_module.ts

@@ -320,7 +320,7 @@ export const NgModule: NgModuleDecorator = makeDecorator(
      * * The `imports` and `exports` options bring in members from other modules, and make
      * this module's members available to others.
      */
-    (type: NgModuleType, meta: NgModule) => SWITCH_COMPILE_NGMODULE(type, meta));
+    (type: Type<any>, meta: NgModule) => SWITCH_COMPILE_NGMODULE(type, meta));
 
 /**
  * @description
@@ -344,13 +344,13 @@ export const NgModule: NgModuleDecorator = makeDecorator(
  */
 export interface DoBootstrap { ngDoBootstrap(appRef: ApplicationRef): void; }
 
-function preR3NgModuleCompile(moduleType: InjectorType<any>, metadata: NgModule): void {
+function preR3NgModuleCompile(moduleType: Type<any>, metadata?: NgModule): void {
   let imports = (metadata && metadata.imports) || [];
   if (metadata && metadata.exports) {
     imports = [...imports, metadata.exports];
   }
 
-  moduleType.ngInjectorDef = ɵɵdefineInjector({
+  (moduleType as InjectorType<any>).ngInjectorDef = ɵɵdefineInjector({
     factory: convertInjectableProviderToFactory(moduleType, {useClass: moduleType}),
     providers: metadata && metadata.providers,
     imports: imports,

packages/core/src/render3/definition.ts

@@ -273,7 +273,7 @@ export function ɵɵdefineComponent<T>(componentDefinition: {
     pipeDefs: null !,       // assigned in noSideEffects
     selectors: componentDefinition.selectors,
     viewQuery: componentDefinition.viewQuery || null,
-    features: componentDefinition.features || null,
+    features: componentDefinition.features as DirectiveDefFeature[] || null,
     data: componentDefinition.data || {},
     // TODO(misko): convert ViewEncapsulation into const enum so that it can be used directly in the
     // next line. Also `None` should be 0 not 2.
@@ -324,8 +324,7 @@ export function ɵɵsetComponentScope(
   def.pipeDefs = () => pipes.map(extractPipeDef);
 }
 
-export function extractDirectiveDef(type: DirectiveType<any>& ComponentType<any>):
-    DirectiveDef<any>|ComponentDef<any> {
+export function extractDirectiveDef(type: Type<any>): DirectiveDef<any>|ComponentDef<any> {
   const def = getComponentDef(type) || getDirectiveDef(type);
   if (ngDevMode && !def) {
     throw new Error(`'${type.name}' is neither 'ComponentType' or 'DirectiveType'.`);
@@ -333,7 +332,7 @@ export function extractDirectiveDef(type: DirectiveType<any>& ComponentType<any>
   return def !;
 }
 
-export function extractPipeDef(type: PipeType<any>): PipeDef<any> {
+export function extractPipeDef(type: Type<any>): PipeDef<any> {
   const def = getPipeDef(type);
   if (ngDevMode && !def) {
     throw new Error(`'${type.name}' is not a 'PipeType'.`);

packages/core/src/render3/di.ts

@@ -556,7 +556,7 @@ export function getNodeInjectable(
     const saveLView = getLView();
     setTNodeAndViewData(tNode, lData);
     try {
-      value = lData[index] = factory.factory(null, tData, lData, tNode);
+      value = lData[index] = factory.factory(undefined, tData, lData, tNode);
     } finally {
       if (factory.injectImpl) setInjectImplementation(previousInjectImplementation);
       setIncludeViewProviders(previousIncludeViewProviders);

packages/core/src/render3/di_setup.ts

@@ -204,7 +204,8 @@ function indexOf(item: any, arr: any[], begin: number, end: number) {
  * Use this with `multi` `providers`.
  */
 function multiProvidersFactoryResolver(
-    this: NodeInjectorFactory, _: null, tData: TData, lData: LView, tNode: TElementNode): any[] {
+    this: NodeInjectorFactory, _: undefined, tData: TData, lData: LView,
+    tNode: TElementNode): any[] {
   return multiResolve(this.multi !, []);
 }
 
@@ -214,7 +215,8 @@ function multiProvidersFactoryResolver(
  * This factory knows how to concatenate itself with the existing `multi` `providers`.
  */
 function multiViewProvidersFactoryResolver(
-    this: NodeInjectorFactory, _: null, tData: TData, lData: LView, tNode: TElementNode): any[] {
+    this: NodeInjectorFactory, _: undefined, tData: TData, lData: LView,
+    tNode: TElementNode): any[] {
   const factories = this.multi !;
   let result: any[];
   if (this.providerFactory) {
@@ -252,7 +254,8 @@ function multiResolve(factories: Array<() => any>, result: any[]): any[] {
  */
 function multiFactory(
     factoryFn: (
-        this: NodeInjectorFactory, _: null, tData: TData, lData: LView, tNode: TElementNode) => any,
+        this: NodeInjectorFactory, _: undefined, tData: TData, lData: LView, tNode: TElementNode) =>
+        any,
     index: number, isViewProvider: boolean, isComponent: boolean,
     f: () => any): NodeInjectorFactory {
   const factory = new NodeInjectorFactory(factoryFn, isViewProvider, ɵɵdirectiveInject);

packages/core/src/render3/instructions/shared.ts

@@ -20,7 +20,7 @@ import {diPublicInInjector, getNodeInjectable, getOrCreateNodeInjectorForNode} f
 import {throwMultipleComponentError} from '../errors';
 import {executeHooks, executePreOrderHooks, registerPreOrderHooks} from '../hooks';
 import {ACTIVE_INDEX, CONTAINER_HEADER_OFFSET, LContainer} from '../interfaces/container';
-import {ComponentDef, ComponentTemplate, DirectiveDef, DirectiveDefListOrFactory, PipeDefListOrFactory, RenderFlags, ViewQueriesFunction} from '../interfaces/definition';
+import {ComponentDef, ComponentTemplate, DirectiveDef, DirectiveDefListOrFactory, FactoryFn, PipeDefListOrFactory, RenderFlags, ViewQueriesFunction} from '../interfaces/definition';
 import {INJECTOR_BLOOM_PARENT_SIZE, NodeInjectorFactory} from '../interfaces/injector';
 import {AttributeMarker, InitialInputData, InitialInputs, LocalRefExtractor, PropertyAliasValue, PropertyAliases, TAttributes, TContainerNode, TElementContainerNode, TElementNode, TIcuContainerNode, TNode, TNodeFlags, TNodeProviderIndexes, TNodeType, TProjectionNode, TViewNode} from '../interfaces/node';
 import {LQueries} from '../interfaces/query';
@@ -1288,8 +1288,7 @@ export function initNodeFlags(tNode: TNode, index: number, numberOfDirectives: n
 }
 
 function baseResolveDirective<T>(
-    tView: TView, viewData: LView, def: DirectiveDef<T>,
-    directiveFactory: (t: Type<T>| null) => any) {
+    tView: TView, viewData: LView, def: DirectiveDef<T>, directiveFactory: FactoryFn<T>) {
   tView.data.push(def);
   const nodeInjectorFactory = new NodeInjectorFactory(directiveFactory, isComponentDef(def), null);
   tView.blueprint.push(nodeInjectorFactory);

packages/core/src/render3/interfaces/injector.ts

@@ -132,7 +132,7 @@ export class NodeInjectorFactory {
   /**
    * The inject implementation to be activated when using the factory.
    */
-  injectImpl: null|(<T>(token: Type<T>|InjectionToken<T>, flags: InjectFlags) => T);
+  injectImpl: null|(<T>(token: Type<T>|InjectionToken<T>, flags?: InjectFlags) => T);
 
   /**
    * Marker set to true during factory invocation to see if we get into recursive loop.
@@ -216,7 +216,7 @@ export class NodeInjectorFactory {
        * Factory to invoke in order to create a new instance.
        */
       public factory:
-          (this: NodeInjectorFactory, _: null,
+          (this: NodeInjectorFactory, _: undefined,
            /**
             * array where injectables tokens are stored. This is used in
             * case of an error reporting to produce friendlier errors.
@@ -234,8 +234,8 @@ export class NodeInjectorFactory {
       /**
        * Set to `true` if the token is declared in `viewProviders` (or if it is component).
        */
-      isViewProvider: boolean,
-      injectImplementation: null|(<T>(token: Type<T>|InjectionToken<T>, flags: InjectFlags) => T)) {
+      isViewProvider: boolean, injectImplementation: null|
+      (<T>(token: Type<T>|InjectionToken<T>, flags?: InjectFlags) => T)) {
     this.canSeeViewProviders = isViewProvider;
     this.injectImpl = injectImplementation;
   }

packages/core/src/render3/pipe.ts

@@ -166,7 +166,7 @@ export function ɵɵpipeBind4(
  *
  * @codeGenApi
  */
-export function ɵɵpipeBindV(index: number, slotOffset: number, values: any[]): any {
+export function ɵɵpipeBindV(index: number, slotOffset: number, values: [any, ...any[]]): any {
   const pipeInstance = ɵɵload<PipeTransform>(index);
   return unwrapValue(
       isPure(index) ? ɵɵpureFunctionV(slotOffset, pipeInstance.transform, values, pipeInstance) :

packages/core/src/render3/styling/host_instructions_queue.ts

@@ -61,7 +61,7 @@ function findNextInsertionIndex(buffer: HostInstructionsQueue, priority: number)
  * Iterates through the host instructions queue (if present within the provided
  * context) and executes each queued instruction entry.
  */
-export function flushQueue(context: StylingContext): void {
+export function flushQueue(this: unknown, context: StylingContext): void {
   const buffer = context[StylingIndex.HostInstructionsQueue];
   if (buffer) {
     for (let i = HostInstructionsQueueIndex.ValuesStartPosition; i < buffer.length;

packages/core/src/render3/styling_next/styling_debug.ts

@@ -201,7 +201,7 @@ export class NodeStylingDebug implements DebugStyling {
     return entries;
   }
 
-  private _mapValues(fn: (prop: string, value: any, bindingIndex: number|null) => any) {
+  private _mapValues(fn: (prop: string, value: string|null, bindingIndex: number|null) => any) {
     // there is no need to store/track an element instance. The
     // element is only used when the styling algorithm attempts to
     // style the value (and we mock out the stylingApplyFn anyway).
@@ -212,9 +212,8 @@ export class NodeStylingDebug implements DebugStyling {
     }
 
     const mapFn: ApplyStylingFn =
-        (renderer: any, element: RElement, prop: string, value: any, bindingIndex: number) => {
-          fn(prop, value, bindingIndex || null);
-        };
+        (renderer: any, element: RElement, prop: string, value: string | null,
+         bindingIndex?: number | null) => { fn(prop, value, bindingIndex || null); };
 
     const sanitizer = this._isClassBased ? null : (this._sanitizer ||
                                                    getCurrentOrLViewSanitizer(this._data as LView));

packages/core/src/render3/styling_next/util.ts

@@ -163,10 +163,10 @@ export function getCurrentOrLViewSanitizer(lView: LView): StyleSanitizeFn|null {
  * sanitization.
  */
 const sanitizeUsingSanitizerObject: StyleSanitizeFn =
-    (prop: string, value: string, mode: StyleSanitizeMode) => {
+    (prop: string, value: string | null, mode?: StyleSanitizeMode) => {
       const sanitizer = getCurrentStyleSanitizer() as Sanitizer;
       if (sanitizer) {
-        if (mode & StyleSanitizeMode.SanitizeOnly) {
+        if (mode !== undefined && mode & StyleSanitizeMode.SanitizeOnly) {
           return sanitizer.sanitize(SecurityContext.STYLE, value);
         } else {
           return true;

packages/core/src/util/decorators.ts

@@ -46,10 +46,11 @@ export function makeDecorator<T>(
     {new (...args: any[]): any; (...args: any[]): any; (...args: any[]): (cls: any) => any;} {
   const metaCtor = makeMetadataCtor(props);
 
-  function DecoratorFactory(...args: any[]): (cls: Type<T>) => any {
+  function DecoratorFactory(
+      this: unknown | typeof DecoratorFactory, ...args: any[]): (cls: Type<T>) => any {
     if (this instanceof DecoratorFactory) {
       metaCtor.call(this, ...args);
-      return this;
+      return this as typeof DecoratorFactory;
     }
 
     const annotationInstance = new (DecoratorFactory as any)(...args);
@@ -79,7 +80,7 @@ export function makeDecorator<T>(
 }
 
 function makeMetadataCtor(props?: (...args: any[]) => any): any {
-  return function ctor(...args: any[]) {
+  return function ctor(this: any, ...args: any[]) {
     if (props) {
       const values = props(...args);
       for (const propName in values) {
@@ -92,7 +93,8 @@ function makeMetadataCtor(props?: (...args: any[]) => any): any {
 export function makeParamDecorator(
     name: string, props?: (...args: any[]) => any, parentClass?: any): any {
   const metaCtor = makeMetadataCtor(props);
-  function ParamDecoratorFactory(...args: any[]): any {
+  function ParamDecoratorFactory(
+      this: unknown | typeof ParamDecoratorFactory, ...args: any[]): any {
     if (this instanceof ParamDecoratorFactory) {
       metaCtor.apply(this, args);
       return this;
@@ -132,7 +134,7 @@ export function makePropDecorator(
     additionalProcessing?: (target: any, name: string, ...args: any[]) => void): any {
   const metaCtor = makeMetadataCtor(props);
 
-  function PropDecoratorFactory(...args: any[]): any {
+  function PropDecoratorFactory(this: unknown | typeof PropDecoratorFactory, ...args: any[]): any {
     if (this instanceof PropDecoratorFactory) {
       metaCtor.apply(this, args);
       return this;

packages/core/src/zone/ng_zone.ts

@@ -267,7 +267,7 @@ function forkInnerZoneWithAngularBehavior(zone: NgZonePrivate) {
 
 
     onInvoke: (delegate: ZoneDelegate, current: Zone, target: Zone, callback: Function,
-               applyThis: any, applyArgs: any[], source: string): any => {
+               applyThis: any, applyArgs?: any[], source?: string): any => {
       try {
         onEnter(zone);
         return delegate.invoke(target, callback, applyThis, applyArgs, source);

packages/core/test/render3/render_util.ts

@@ -302,7 +302,7 @@ function toDefs(
     types: PipeTypesOrFactory | undefined | null,
     mapFn: (type: Type<any>) => PipeDef<any>): PipeDefList|null;
 function toDefs(
-    types: PipeTypesOrFactory | DirectiveTypesOrFactory | undefined | null,
+    types: Type<any>[] | (() => Type<any>[]) | undefined | null,
     mapFn: (type: Type<any>) => PipeDef<any>| DirectiveDef<any>): any {
   if (!types) return null;
   if (typeof types == 'function') {

packages/core/test/render3/styling/class_and_style_bindings_spec.ts

@@ -3104,7 +3104,6 @@ describe('style and class based bindings', () => {
            static ngComponentDef = ɵɵdefineComponent({
              type: Comp,
              selectors: [['comp']],
-             directives: [Comp],
              factory: () => new Comp(),
              consts: 1,
              vars: 0,
@@ -3178,7 +3177,6 @@ describe('style and class based bindings', () => {
         static ngComponentDef = ɵɵdefineComponent({
           type: Comp,
           selectors: [['comp']],
-          directives: [Comp],
           factory: () => new Comp(),
           consts: 1,
           vars: 0,
@@ -3275,7 +3273,7 @@ describe('style and class based bindings', () => {
         static ngComponentDef = ɵɵdefineComponent({
           type: Comp,
           selectors: [['comp']],
-          directives: [Comp, MyDir],
+          directives: [MyDir],
           factory: () => new Comp(),
           consts: 1,
           vars: 0,

packages/core/testing/src/async_fallback.ts

@@ -36,7 +36,7 @@ export function asyncFallback(fn: Function): (done: any) => any {
   // function when asynchronous activity is finished.
   if (_global.jasmine) {
     // Not using an arrow function to preserve context passed from call site
-    return function(done: any) {
+    return function(this: unknown, done: any) {
       if (!done) {
         // if we run beforeEach in @angular/core/testing/testing_internal then we get no done
         // fake it here and assume sync.
@@ -56,7 +56,7 @@ export function asyncFallback(fn: Function): (done: any) => any {
   // is finished. This will be correctly consumed by the Mocha framework with
   // it('...', async(myFn)); or can be used in a custom framework.
   // Not using an arrow function to preserve context passed from call site
-  return function() {
+  return function(this: unknown) {
     return new Promise<void>((finishCallback, failCallback) => {
       runInTestZone(fn, this, finishCallback, failCallback);
     });

packages/core/testing/src/fake_async_fallback.ts

@@ -55,7 +55,7 @@ let _inFakeAsyncCall = false;
  */
 export function fakeAsyncFallback(fn: Function): (...args: any[]) => any {
   // Not using an arrow function to preserve context passed from call site
-  return function(...args: any[]) {
+  return function(this: unknown, ...args: any[]) {
     const proxyZoneSpec = ProxyZoneSpec.assertPresent();
     if (_inFakeAsyncCall) {
       throw new Error('fakeAsync() calls can not be nested');

packages/core/testing/src/r3_test_bed_compiler.ts

@@ -517,20 +517,21 @@ export class R3TestBedCompiler {
       op.def[op.field] = op.original;
     }
     // Restore initial component/directive/pipe defs
-    this.initialNgDefs.forEach((value: [string, PropertyDescriptor], type: Type<any>) => {
-      const [prop, descriptor] = value;
-      if (!descriptor) {
-        // Delete operations are generally undesirable since they have performance implications
-        // on objects they were applied to. In this particular case, situations where this code is
-        // invoked should be quite rare to cause any noticable impact, since it's applied only to
-        // some test cases (for example when class with no annotations extends some @Component)
-        // when we need to clear 'ngComponentDef' field on a given class to restore its original
-        // state (before applying overrides and running tests).
-        delete (type as any)[prop];
-      } else {
-        Object.defineProperty(type, prop, descriptor);
-      }
-    });
+    this.initialNgDefs.forEach(
+        (value: [string, PropertyDescriptor | undefined], type: Type<any>) => {
+          const [prop, descriptor] = value;
+          if (!descriptor) {
+            // Delete operations are generally undesirable since they have performance implications
+            // on objects they were applied to. In this particular case, situations where this code
+            // is invoked should be quite rare to cause any noticeable impact, since it's applied
+            // only to some test cases (for example when class with no annotations extends some
+            // @Component) when we need to clear 'ngComponentDef' field on a given class to restore
+            // its original state (before applying overrides and running tests).
+            delete (type as any)[prop];
+          } else {
+            Object.defineProperty(type, prop, descriptor);
+          }
+        });
     this.initialNgDefs.clear();
     this.moduleProvidersOverridden.clear();
     this.restoreComponentResolutionQueue();

packages/core/testing/src/test_bed.ts

@@ -654,7 +654,7 @@ export function inject(tokens: any[], fn: Function): () => any {
   const testBed = getTestBed();
   if (tokens.indexOf(AsyncTestCompleter) >= 0) {
     // Not using an arrow function to preserve context passed from call site
-    return function() {
+    return function(this: unknown) {
       // Return an async test method that returns a Promise if AsyncTestCompleter is one of
       // the injected tokens.
       return testBed.compileComponents().then(() => {
@@ -665,7 +665,7 @@ export function inject(tokens: any[], fn: Function): () => any {
     };
   } else {
     // Not using an arrow function to preserve context passed from call site
-    return function() { return testBed.execute(tokens, fn, this); };
+    return function(this: unknown) { return testBed.execute(tokens, fn, this); };
   }
 }
 
@@ -685,7 +685,7 @@ export class InjectSetupWrapper {
   inject(tokens: any[], fn: Function): () => any {
     const self = this;
     // Not using an arrow function to preserve context passed from call site
-    return function() {
+    return function(this: unknown) {
       self._addModule();
       return inject(tokens, fn).call(this);
     };
@@ -701,7 +701,7 @@ export function withModule(moduleDef: TestModuleMetadata, fn?: Function | null):
     InjectSetupWrapper {
   if (fn) {
     // Not using an arrow function to preserve context passed from call site
-    return function() {
+    return function(this: unknown) {
       const testBed = getTestBed();
       if (moduleDef) {
         testBed.configureTestingModule(moduleDef);

packages/core/testing/src/testing_internal.ts

@@ -39,6 +39,8 @@ const globalTimeOut = jasmine.DEFAULT_TIMEOUT_INTERVAL;
 
 const testBed = getTestBed();
 
+export type TestFn = ((done: DoneFn) => any) | (() => any);
+
 /**
  * Mechanism to run `beforeEach()` functions of Angular tests.
  *
@@ -112,8 +114,7 @@ export function beforeEachProviders(fn: Function): void {
 }
 
 
-function _it(
-    jsmFn: Function, testName: string, testFn: (done?: DoneFn) => any, testTimeout = 0): void {
+function _it(jsmFn: Function, testName: string, testFn: TestFn, testTimeout = 0): void {
   if (runnerStack.length == 0) {
     // This left here intentionally, as we should never get here, and it aids debugging.
     // tslint:disable-next-line
@@ -135,7 +136,9 @@ function _it(
     runner.run();
 
     if (testFn.length === 0) {
-      const retVal = testFn();
+      // TypeScript doesn't infer the TestFn type without parameters here, so we
+      // need to manually cast it.
+      const retVal = (testFn as() => any)();
       if (isPromise(retVal)) {
         // Asynchronous test function that returns a Promise - wait for completion.
         retVal.then(done, done.fail);
@@ -150,15 +153,15 @@ function _it(
   }, timeout);
 }
 
-export function it(expectation: string, assertion: (done: DoneFn) => any, timeout?: number): void {
+export function it(expectation: string, assertion: TestFn, timeout?: number): void {
   return _it(jsmIt, expectation, assertion, timeout);
 }
 
-export function fit(expectation: string, assertion: (done: DoneFn) => any, timeout?: number): void {
+export function fit(expectation: string, assertion: TestFn, timeout?: number): void {
   return _it(jsmFIt, expectation, assertion, timeout);
 }
 
-export function xit(expectation: string, assertion: (done: DoneFn) => any, timeout?: number): void {
+export function xit(expectation: string, assertion: TestFn, timeout?: number): void {
   return _it(jsmXIt, expectation, assertion, timeout);
 }
 

packages/tsconfig-build-no-strict.json

@@ -0,0 +1,10 @@
+{
+  "extends": "./tsconfig-build.json",
+  "compilerOptions": {
+    "strict": false
+  },
+  "bazelOptions": {
+    "suppressTsconfigOverrideWarnings": true,
+    "devmodeTargetOverride": "es5"
+  }
+}

packages/tsconfig-build.json

@@ -9,6 +9,7 @@
     "stripInternal": true,
     "noImplicitAny": true,
     "strictNullChecks": true,
+    "strict": true,
     "strictPropertyInitialization": true,
     "noFallthroughCasesInSwitch": true,
     "moduleResolution": "node",

packages/tsconfig-test.json

@@ -4,11 +4,12 @@
 {
   "extends": "./tsconfig-build.json",
   "compilerOptions": {
+    "strict": false,
     "types": ["node", "jasmine"],
     "plugins": [{
         "name": "@bazel/tsetse",
-        "disabledRules": ["must-use-promises"],
-    }],
+        "disabledRules": ["must-use-promises"]
+    }]
   },
   "bazelOptions": {
     "suppressTsconfigOverrideWarnings": true,

tools/public_api_guard/core/core.d.ts

@@ -950,7 +950,7 @@ export declare function ɵɵpipeBind3(index: number, slotOffset: number, v1: any
 
 export declare function ɵɵpipeBind4(index: number, slotOffset: number, v1: any, v2: any, v3: any, v4: any): any;
 
-export declare function ɵɵpipeBindV(index: number, slotOffset: number, values: any[]): any;
+export declare function ɵɵpipeBindV(index: number, slotOffset: number, values: [any, ...any[]]): any;
 
 export declare type ɵɵPipeDefWithMeta<T, Name extends string> = PipeDef<T>;