fix(core): Update types for TypeScript nullability support (#15472)

packages/compiler-cli/integrationtest/test/source_map_spec.ts

@@ -30,7 +30,7 @@ function getSourcePositionForStack(stack: string): {source: string, line: number
   const htmlLocations = stack
                             .split('\n')
                             // e.g. at View_MyComp_0 (...html:153:40)
-                            .map(line => /\((.*\.html):(\d+):(\d+)/.exec(line))
+                            .map(line => /\((.*\.html):(\d+):(\d+)/.exec(line) !)
                             .filter(match => !!match)
                             .map(match => ({
                                    source: match[1],

packages/compiler-cli/integrationtest/test/test_ngtools_api.ts

@@ -67,9 +67,9 @@ function codeGenTest() {
         angularCompilerOptions: config.ngOptions,
 
         // i18n options.
-        i18nFormat: null,
-        i18nFile: null,
-        locale: null,
+        i18nFormat: undefined,
+        i18nFile: undefined,
+        locale: undefined,
 
         readResource: (fileName: string) => {
           readResources.push(fileName);
@@ -131,8 +131,8 @@ function i18nTest() {
         compilerOptions: config.parsed.options, program, host,
         angularCompilerOptions: config.ngOptions,
         i18nFormat: 'xlf',
-        locale: null,
-        outFile: null,
+        locale: undefined,
+        outFile: undefined,
         readResource: (fileName: string) => {
           readResources.push(fileName);
           return hostContext.readResource(fileName);

packages/compiler-cli/integrationtest/test/test_summaries.ts

@@ -34,7 +34,8 @@ function main() {
       if (/.*\/node_modules\/.*/.test(fileName) && !/.*ngsummary\.json$/.test(fileName) &&
           !/package\.json$/.test(fileName)) {
         // Only allow to read summaries and package.json files from node_modules
-        return null;
+        // TODO (mhevery): Fix this. TypeScript.d.ts does not allow returning null.
+        return null !;
       }
       readFiles.push(path.relative(basePath, fileName));
       return super.readFile(fileName);

packages/compiler-cli/integrationtest/test/util.ts

@@ -13,7 +13,7 @@ import {platformServer} from '@angular/platform-server';
 import {MainModule} from '../src/module';
 import {MainModuleNgFactory} from '../src/module.ngfactory';
 
-let mainModuleRef: NgModuleRef<MainModule> = null;
+let mainModuleRef: NgModuleRef<MainModule> = null !;
 beforeEach((done) => {
   platformServer().bootstrapModuleFactory(MainModuleNgFactory).then((moduleRef: any) => {
     mainModuleRef = moduleRef;
@@ -29,5 +29,5 @@ export function createComponent<C>(comp: {new (...args: any[]): C}): ComponentFi
   const moduleRef = createModule();
   const compRef =
       moduleRef.componentFactoryResolver.resolveComponentFactory(comp).create(moduleRef.injector);
-  return new ComponentFixture(compRef, null, null);
+  return new ComponentFixture(compRef, null, false);
 }

packages/compiler-cli/integrationtest/tsconfig-build.json

@@ -10,6 +10,8 @@
     "target": "es5",
     "experimentalDecorators": true,
     "noImplicitAny": true,
+    "strictNullChecks": true,
+    "skipLibCheck": true,
     "moduleResolution": "node",
     "rootDir": "",
     "declaration": true,
@@ -32,4 +34,4 @@
     "benchmarks/src/largetable/ng2/index_aot.ts",
     "benchmarks/src/largetable/ng2_switch/index_aot.ts"
   ]
-}
+}