refactor(core): make `lockRunMode` a noop and deprecate it.

BREAKING CHANGE:
- `lockRunMode` is deprecated and no more needed.

Closes #9878

modules/@angular/compiler-cli/integrationtest/test/init.ts

@@ -12,7 +12,3 @@ require('reflect-metadata');
 
 require('zone.js/dist/zone-node.js');
 require('zone.js/dist/long-stack-trace-zone.js');
-
-import {lockRunMode} from '@angular/core';
-// Need to lock the mode explicitely as this test is not using Angular's testing framework.
-lockRunMode();

modules/@angular/compiler-cli/src/codegen.ts

@@ -11,7 +11,7 @@
  * Intended to be used in a build step.
  */
 import * as compiler from '@angular/compiler';
-import {AppModuleMetadata, ComponentMetadata, ViewEncapsulation, lockRunMode} from '@angular/core';
+import {AppModuleMetadata, ComponentMetadata, ViewEncapsulation} from '@angular/core';
 import {AngularCompilerOptions} from '@angular/tsc-wrapped';
 import * as path from 'path';
 import * as ts from 'typescript';
@@ -36,9 +36,7 @@ export class CodeGenerator {
       private options: AngularCompilerOptions, private program: ts.Program,
       public host: ts.CompilerHost, private staticReflector: StaticReflector,
       private resolver: CompileMetadataResolver, private compiler: compiler.OfflineCompiler,
-      private reflectorHost: ReflectorHost) {
-    lockRunMode();
-  }
+      private reflectorHost: ReflectorHost) {}
 
   private readFileMetadata(absSourcePath: string): FileMetadata {
     const moduleMetadata = this.staticReflector.getModuleMetadata(absSourcePath);

modules/@angular/compiler-cli/src/extract_i18n.ts

@@ -19,7 +19,7 @@ import * as ts from 'typescript';
 import * as tsc from '@angular/tsc-wrapped';
 import * as path from 'path';
 import * as compiler from '@angular/compiler';
-import {ViewEncapsulation, lockRunMode} from '@angular/core';
+import {ViewEncapsulation} from '@angular/core';
 
 import {StaticReflector} from './static_reflector';
 import {CompileMetadataResolver, HtmlParser, DirectiveNormalizer, Lexer, Parser, DomElementSchemaRegistry, TypeScriptEmitter, MessageExtractor, removeDuplicates, ExtractionResult, Message, ParseError, serializeXmb,} from './compiler_private';
@@ -41,9 +41,7 @@ class Extractor {
       private _options: tsc.AngularCompilerOptions, private _program: ts.Program,
       public host: ts.CompilerHost, private staticReflector: StaticReflector,
       private _resolver: CompileMetadataResolver, private _normalizer: DirectiveNormalizer,
-      private _reflectorHost: ReflectorHost, private _extractor: MessageExtractor) {
-    lockRunMode();
-  }
+      private _reflectorHost: ReflectorHost, private _extractor: MessageExtractor) {}
 
   private _extractCmpMessages(components: compiler.CompileDirectiveMetadata[]): ExtractionResult {
     if (!components || !components.length) {

modules/@angular/core/src/application_ref.ts

@@ -64,30 +64,28 @@ export function enableProdMode(): void {
   _devMode = false;
 }
 
-/**
- * Returns whether Angular is in development mode.
- * This can only be read after `lockRunMode` has been called.
- *
- * By default, this is true, unless a user calls `enableProdMode`.
- *
- * @experimental APIs related to application bootstrap are currently under review.
- */
-export function isDevMode(): boolean {
-  if (!_runModeLocked) {
-    throw new BaseException(`Dev mode can't be read before bootstrap!`);
-  }
-  return _devMode;
-}
-
 /**
  * Locks the run mode of Angular. After this has been called,
  * it can't be changed any more. I.e. `isDevMode()` will always
  * return the same value.
  *
- * @experimental APIs related to application bootstrap are currently under review.
+ * @deprecated This is a noop now. {@link isDevMode} automatically locks the run mode on first call.
  */
 export function lockRunMode(): void {
+  console.warn('lockRunMode() is deprecated and not needed any more.');
+}
+
+/**
+ * Returns whether Angular is in development mode. After called once,
+ * the value is locked and won't change any more.
+ *
+ * By default, this is true, unless a user calls `enableProdMode` before calling this.
+ *
+ * @experimental APIs related to application bootstrap are currently under review.
+ */
+export function isDevMode(): boolean {
   _runModeLocked = true;
+  return _devMode;
 }
 
 /**
@@ -104,7 +102,6 @@ export function createPlatform(injector: Injector): PlatformRef {
     throw new BaseException(
         'There can be only one platform. Destroy the previous one to create a new one.');
   }
-  lockRunMode();
   _inPlatformCreate = true;
   try {
     _platform = injector.get(PlatformRef);

modules/@angular/platform-browser-dynamic/index.ts

@@ -8,7 +8,7 @@
 
 import {COMMON_DIRECTIVES, COMMON_PIPES} from '@angular/common';
 import {COMPILER_PROVIDERS, CompilerConfig, XHR} from '@angular/compiler';
-import {AppModule, AppModuleRef, ApplicationRef, Compiler, ComponentRef, ComponentResolver, ExceptionHandler, PLATFORM_DIRECTIVES, PLATFORM_PIPES, ReflectiveInjector, Type, coreLoadAndBootstrap, isDevMode, lockRunMode} from '@angular/core';
+import {AppModule, AppModuleRef, ApplicationRef, Compiler, ComponentRef, ComponentResolver, ExceptionHandler, PLATFORM_DIRECTIVES, PLATFORM_PIPES, ReflectiveInjector, Type, coreLoadAndBootstrap, isDevMode} from '@angular/core';
 import {BROWSER_APP_PROVIDERS, BrowserModule, WORKER_APP_APPLICATION_PROVIDERS, WORKER_SCRIPT, WORKER_UI_APPLICATION_PROVIDERS, bootstrapModuleFactory, browserPlatform, workerAppPlatform, workerUiPlatform} from '@angular/platform-browser';
 
 import {Console, ReflectionCapabilities, reflector} from './core_private';
@@ -44,7 +44,6 @@ export const CACHED_TEMPLATE_PROVIDER: Array<any /*Type | Provider | any[]*/> =
     [{provide: XHR, useClass: CachedXHR}];
 
 function _initGlobals() {
-  lockRunMode();
   initDomAdapter();
   reflector.reflectionCapabilities = new ReflectionCapabilities();
 }
@@ -212,13 +211,13 @@ export function bootstrap<C>(
     precompile = normalizeArray(customProvidersOrDynamicModule.precompile);
     compiler = customProvidersOrDynamicModule.compiler;
   }
-  let deprecationMessages: string[] = [];
+  const deprecationMessages: string[] = [];
   if (providers && providers.length > 0) {
     // Note: This is a hack to still support the old way
     // of configuring platform directives / pipes and the compiler xhr.
     // This will soon be deprecated!
-    let inj = ReflectiveInjector.resolveAndCreate(providers);
-    let compilerConfig: CompilerConfig = inj.get(CompilerConfig, null);
+    const inj = ReflectiveInjector.resolveAndCreate(providers);
+    const compilerConfig: CompilerConfig = inj.get(CompilerConfig, null);
     if (compilerConfig) {
       // Note: forms read the platform directives / pipes, modify them
       // and provide a CompilerConfig out of it
@@ -229,20 +228,20 @@ export function bootstrap<C>(
     } else {
       // If nobody provided a CompilerConfig, use the
       // PLATFORM_DIRECTIVES / PLATFORM_PIPES values directly.
-      let platformDirectives = inj.get(PLATFORM_DIRECTIVES, []);
+      const platformDirectives = inj.get(PLATFORM_DIRECTIVES, []);
       if (platformDirectives.length > 0) {
         deprecationMessages.push(
             `Passing PLATFORM_DIRECTIVES to "bootstrap()" as provider is deprecated. Use the new parameter "directives" of "bootstrap()" instead.`);
       }
       directives = directives.concat(platformDirectives);
-      let platformPipes = inj.get(PLATFORM_PIPES, []);
+      const platformPipes = inj.get(PLATFORM_PIPES, []);
       if (platformPipes.length > 0) {
         deprecationMessages.push(
             `Passing PLATFORM_PIPES to "bootstrap()" as provider is deprecated. Use the new parameter "pipes" of "bootstrap()" instead.`);
       }
       pipes = pipes.concat(platformPipes);
     }
-    let xhr = inj.get(XHR, null);
+    const xhr = inj.get(XHR, null);
     if (xhr) {
       compilerProviders.push([{provide: XHR, useValue: xhr}]);
       deprecationMessages.push(
@@ -250,7 +249,7 @@ export function bootstrap<C>(
     }
     // Need to copy console from providers to compiler
     // as well so that we can test the above deprecation messages!
-    let console = inj.get(Console, null);
+    const console = inj.get(Console, null);
     if (console) {
       compilerProviders.push([{provide: Console, useValue: console}]);
     }
@@ -258,10 +257,8 @@ export function bootstrap<C>(
   if (!compiler) {
     compiler = browserCompiler({providers: compilerProviders});
   }
-  deprecationMessages.forEach((msg) => {
-    let console: Console = compiler.injector.get(Console);
-    console.warn(msg);
-  });
+  const console: Console = compiler.injector.get(Console);
+  deprecationMessages.forEach((msg) => { console.warn(msg); });
 
   @AppModule({
     providers: providers,

tools/public_api_guard/core/index.d.ts

@@ -895,7 +895,7 @@ export declare class KeyValueDiffers {
     static extend(factories: KeyValueDifferFactory[]): Provider;
 }
 
-/** @experimental */
+/** @deprecated */
 export declare function lockRunMode(): void;
 
 /** @experimental */