feat(core): support TypeScript 4.2 (#41158)

Updates the repo to TypeScript 4.2 and tslib 2.1.0.

PR Close #41158

aio/aio-builds-setup/dockerbuild/scripts-js/package.json

@@ -33,7 +33,7 @@
     "shelljs": "^0.8.4",
     "source-map-support": "^0.5.19",
     "tar-stream": "^2.1.3",
-    "tslib": "^2.0.1"
+    "tslib": "^2.1.0"
   },
   "devDependencies": {
     "@types/body-parser": "^1.19.0",
@@ -49,6 +49,6 @@
     "supertest": "^4.0.2",
     "tslint": "^6.1.3",
     "tslint-jasmine-noSkipOrFocus": "^1.0.9",
-    "typescript": "^4.1.2"
+    "typescript": "^4.2.3"
   }
 }

aio/aio-builds-setup/dockerbuild/scripts-js/yarn.lock

@@ -2505,10 +2505,10 @@ tslib@^1.8.1:
   version "1.9.3"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.9.3.tgz#d7e4dd79245d85428c4d7e4822a79917954ca286"
 
-tslib@^2.0.1:
+tslib@^2.1.0:
-  version "2.0.1"
+  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.0.1.tgz#410eb0d113e5b6356490eec749603725b021b43e"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"
-  integrity sha512-SgIkNheinmEBgx1IUNirK0TUD4X9yjjBRTqqjggWCU3pUEqIk3/Uwl3yRixYKT6WjQuGiwDv4NomL3wqRCj+CQ==
+  integrity sha512-hcVC3wYEziELGGmEEXue7D75zbwIIVUMWAVbHItGPx0ziyXxrOMQx4rQEVEV45Ut/1IotuEvwqPopzIOkDMf0A==
 
 tslint-jasmine-noSkipOrFocus@^1.0.9:
   version "1.0.9"
@@ -2563,10 +2563,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@^4.1.2:
+typescript@^4.2.3:
-  version "4.1.2"
+  version "4.2.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.2.tgz#6369ef22516fe5e10304aae5a5c4862db55380e9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
-  integrity sha512-thGloWsGH3SOxv1SoY7QojKi0tc+8FnOmiarEGMbd/lar7QOEd3hvlx3Fp5y6FlDUGl9L+pd4n2e+oToGMmhRQ==
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
 
 undefsafe@^2.0.2:
   version "2.0.2"

aio/content/examples/testing/src/app/demo/async-helper.spec.ts

@@ -1,7 +1,7 @@
 // tslint:disable-next-line:no-unused-variable
-import { fakeAsync, tick, waitForAsync } from '@angular/core/testing';
+import {fakeAsync, tick, waitForAsync} from '@angular/core/testing';
-import { interval, of } from 'rxjs';
+import {interval, of} from 'rxjs';
-import { delay, take } from 'rxjs/operators';
+import {delay, take} from 'rxjs/operators';
 
 describe('Angular async helper', () => {
   describe('async', () => {
@@ -183,7 +183,7 @@ describe('Angular async helper', () => {
     // before loading zone.js/testing
     it('should wait until promise.then is called', waitForAsync(() => {
          let finished = false;
-         new Promise((res, rej) => {
+         new Promise<void>(res => {
            jsonp('localhost:8080/jsonp', () => {
              // success callback and resolve the promise
              finished = true;

aio/package.json

@@ -104,7 +104,7 @@
     "@angular/service-worker": "11.2.3",
     "@webcomponents/custom-elements": "1.2.1",
     "rxjs": "^6.5.3",
-    "tslib": "^2.0.0",
+    "tslib": "^2.1.0",
     "zone.js": "~0.11.4"
   },
   "devDependencies": {
@@ -170,7 +170,7 @@
     "tree-kill": "^1.1.0",
     "ts-node": "^8.4.1",
     "tslint": "~6.1.0",
-    "typescript": "~4.1.2",
+    "typescript": "~4.2.3",
     "uglify-js": "^3.0.15",
     "unist-util-filter": "^0.2.1",
     "unist-util-source": "^1.0.1",

aio/yarn.lock

@@ -13722,10 +13722,10 @@ typescript@^3.2.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.7.5.tgz#0692e21f65fd4108b9330238aac11dd2e177a1ae"
   integrity sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw==
 
-typescript@~4.1.2:
+typescript@~4.2.3:
-  version "4.1.5"
+  version "4.2.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.5.tgz#123a3b214aaff3be32926f0d8f1f6e704eb89a72"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
-  integrity sha512-6OSu9PTIzmn9TCDiovULTnET6BgXtDYL4Gg4szY+cGsc3JP1dQL8qvE8kShTRx1NIw4Q9IBHlwODjkjWEtMUyA==
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
 
 ua-parser-js@^0.7.23:
   version "0.7.24"

dev-infra/build-worker.js

@@ -58,7 +58,7 @@ function buildLogLevelFunction(loadCommand, level) {
         for (var _i = 0; _i < arguments.length; _i++) {
             text[_i] = arguments[_i];
         }
-        runConsoleCommand.apply(void 0, tslib.__spread([loadCommand, level], text));
+        runConsoleCommand.apply(void 0, tslib.__spreadArray([loadCommand, level], tslib.__read(text)));
     };
     /** Start a group at the LOG_LEVEL, optionally starting it as collapsed. */
     loggingFunction.group = function (text, collapsed) {
@@ -87,9 +87,9 @@ function runConsoleCommand(loadCommand, logLevel) {
         text[_i - 2] = arguments[_i];
     }
     if (getLogLevel() >= logLevel) {
-        loadCommand().apply(void 0, tslib.__spread(text));
+        loadCommand().apply(void 0, tslib.__spreadArray([], tslib.__read(text)));
     }
-    printToLogFile.apply(void 0, tslib.__spread([logLevel], text));
+    printToLogFile.apply(void 0, tslib.__spreadArray([logLevel], tslib.__read(text)));
 }
 /**
  * Retrieve the log level from environment variables, if the value found

dev-infra/ng-dev.js

@@ -239,7 +239,7 @@ function promptAutocomplete(message, choices, noChoiceText) {
                 case 0:
                     prompt = inquirer.createPromptModule({}).registerPrompt('autocomplete', inquirerAutocomplete);
                     if (noChoiceText) {
-                        choices = tslib.__spread([noChoiceText], choices);
+                        choices = tslib.__spreadArray([noChoiceText], tslib.__read(choices));
                     }
                     return [4 /*yield*/, prompt({
                             type: 'autocomplete',
@@ -313,7 +313,7 @@ function buildLogLevelFunction(loadCommand, level) {
         for (var _i = 0; _i < arguments.length; _i++) {
             text[_i] = arguments[_i];
         }
-        runConsoleCommand.apply(void 0, tslib.__spread([loadCommand, level], text));
+        runConsoleCommand.apply(void 0, tslib.__spreadArray([loadCommand, level], tslib.__read(text)));
     };
     /** Start a group at the LOG_LEVEL, optionally starting it as collapsed. */
     loggingFunction.group = function (text, collapsed) {
@@ -342,9 +342,9 @@ function runConsoleCommand(loadCommand, logLevel) {
         text[_i - 2] = arguments[_i];
     }
     if (getLogLevel() >= logLevel) {
-        loadCommand().apply(void 0, tslib.__spread(text));
+        loadCommand().apply(void 0, tslib.__spreadArray([], tslib.__read(text)));
     }
-    printToLogFile.apply(void 0, tslib.__spread([logLevel], text));
+    printToLogFile.apply(void 0, tslib.__spreadArray([logLevel], tslib.__read(text)));
 }
 /**
  * Retrieve the log level from environment variables, if the value found
@@ -2254,7 +2254,7 @@ function allChangedFilesSince(sha) {
     var diffFiles = gitOutputAsArray("git diff --name-only --diff-filter=d " + sha);
     var untrackedFiles = gitOutputAsArray("git ls-files --others --exclude-standard");
     // Use a set to deduplicate the list as its possible for a file to show up in both lists.
-    return Array.from(new Set(tslib.__spread(diffFiles, untrackedFiles)));
+    return Array.from(new Set(tslib.__spreadArray(tslib.__spreadArray([], tslib.__read(diffFiles)), tslib.__read(untrackedFiles))));
 }
 /**
  * A list of all staged files which have been modified.
@@ -2947,7 +2947,7 @@ function getPr(prSchema, prNumber, git) {
                     PR_QUERY = typedGraphqlify.params({
                         $number: 'Int!',
                         $owner: 'String!',
-                        $name: 'String!',
+                        $name: 'String!', // The organization to query for
                     }, {
                         repository: typedGraphqlify.params({ owner: '$owner', name: '$name' }, {
                             pullRequest: typedGraphqlify.params({ number: '$number' }, prSchema),
@@ -2973,7 +2973,7 @@ function getPendingPrs(prSchema, git) {
                         $first: 'Int',
                         $after: 'String',
                         $owner: 'String!',
-                        $name: 'String!',
+                        $name: 'String!', // The repository to query for
                     }, {
                         repository: typedGraphqlify.params({ owner: '$owner', name: '$name' }, {
                             pullRequests: typedGraphqlify.params({
@@ -3003,7 +3003,7 @@ function getPendingPrs(prSchema, git) {
                     return [4 /*yield*/, git.github.graphql.query(PRS_QUERY, params_1)];
                 case 2:
                     results = _b.sent();
-                    prs.push.apply(prs, tslib.__spread(results.repository.pullRequests.nodes));
+                    prs.push.apply(prs, tslib.__spreadArray([], tslib.__read(results.repository.pullRequests.nodes)));
                     hasNextPage = results.repository.pullRequests.pageInfo.hasNextPage;
                     cursor = results.repository.pullRequests.pageInfo.endCursor;
                     return [3 /*break*/, 1];
@@ -3598,7 +3598,7 @@ var MergeStrategy = /** @class */ (function () {
                 // Checkout the local target branch.
                 this.git.run(['checkout', localTargetBranch]);
                 // Cherry-pick the refspec into the target branch.
-                if (this.git.runGraceful(tslib.__spread(['cherry-pick'], cherryPickArgs)).status !== 0) {
+                if (this.git.runGraceful(tslib.__spreadArray(['cherry-pick'], tslib.__read(cherryPickArgs))).status !== 0) {
                     // Abort the failed cherry-pick. We do this because Git persists the failed
                     // cherry-pick state globally in the repository. This could prevent future
                     // pull request merges as a Git thinks a cherry-pick is still in progress.
@@ -3637,7 +3637,7 @@ var MergeStrategy = /** @class */ (function () {
         });
         // Fetch all target branches with a single command. We don't want to fetch them
         // individually as that could cause an unnecessary slow-down.
-        this.git.run(tslib.__spread(['fetch', '-q', '-f', this.git.repoGitUrl], fetchRefspecs, extraRefspecs));
+        this.git.run(tslib.__spreadArray(tslib.__spreadArray(['fetch', '-q', '-f', this.git.repoGitUrl], tslib.__read(fetchRefspecs)), tslib.__read(extraRefspecs)));
     };
     /** Pushes the given target branches upstream. */
     MergeStrategy.prototype.pushTargetBranchesUpstream = function (names) {
@@ -3648,7 +3648,7 @@ var MergeStrategy = /** @class */ (function () {
         });
         // Push all target branches with a single command if we don't run in dry-run mode.
         // We don't want to push them individually as that could cause an unnecessary slow-down.
-        this.git.run(tslib.__spread(['push', this.git.repoGitUrl], pushRefspecs));
+        this.git.run(tslib.__spreadArray(['push', this.git.repoGitUrl], tslib.__read(pushRefspecs)));
     };
     return MergeStrategy;
 }());

integration/BUILD.bazel

@@ -97,6 +97,12 @@ INTEGRATION_TESTS = {
         # root @npm//typescript package.
         "pinned_npm_packages": ["typescript"],
     },
+    "typings_test_ts42": {
+        # Special case for `typings_test_ts42` test as we want to pin
+        # `typescript` at version 4.2.x for that test and not link to the
+        # root @npm//typescript package.
+        "pinned_npm_packages": ["typescript"],
+    },
 }
 
 [

integration/typings_test_ts42/include-all.ts

@@ -0,0 +1,69 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+
+
+import * as animations from '@angular/animations';
+import * as animationsBrowser from '@angular/animations/browser';
+import * as animationsBrowserTesting from '@angular/animations/browser/testing';
+import * as common from '@angular/common';
+import * as commonHttp from '@angular/common/http';
+import * as commonTesting from '@angular/common/testing';
+import * as commonHttpTesting from '@angular/common/testing';
+import * as compiler from '@angular/compiler';
+import * as compilerTesting from '@angular/compiler/testing';
+import * as core from '@angular/core';
+import * as coreTesting from '@angular/core/testing';
+import * as elements from '@angular/elements';
+import * as forms from '@angular/forms';
+import * as platformBrowser from '@angular/platform-browser';
+import * as platformBrowserDynamic from '@angular/platform-browser-dynamic';
+import * as platformBrowserDynamicTesting from '@angular/platform-browser-dynamic/testing';
+import * as platformBrowserAnimations from '@angular/platform-browser/animations';
+import * as platformBrowserTesting from '@angular/platform-browser/testing';
+import * as platformServer from '@angular/platform-server';
+import * as platformServerInit from '@angular/platform-server/init';
+import * as platformServerTesting from '@angular/platform-server/testing';
+import * as router from '@angular/router';
+import * as routerTesting from '@angular/router/testing';
+import * as routerUpgrade from '@angular/router/upgrade';
+import * as serviceWorker from '@angular/service-worker';
+import * as upgrade from '@angular/upgrade';
+import * as upgradeStatic from '@angular/upgrade/static';
+import * as upgradeTesting from '@angular/upgrade/static/testing';
+
+export default {
+  animations,
+  animationsBrowser,
+  animationsBrowserTesting,
+  common,
+  commonTesting,
+  commonHttp,
+  commonHttpTesting,
+  compiler,
+  compilerTesting,
+  core,
+  coreTesting,
+  elements,
+  forms,
+  platformBrowser,
+  platformBrowserTesting,
+  platformBrowserDynamic,
+  platformBrowserDynamicTesting,
+  platformBrowserAnimations,
+  platformServer,
+  platformServerInit,
+  platformServerTesting,
+  router,
+  routerTesting,
+  routerUpgrade,
+  serviceWorker,
+  upgrade,
+  upgradeStatic,
+  upgradeTesting,
+};

integration/typings_test_ts42/package.json

@@ -0,0 +1,28 @@
+{
+  "name": "angular-integration",
+  "description": "Assert that users with TypeScript 4.2 can type-check an Angular application",
+  "version": "0.0.0",
+  "license": "MIT",
+  "dependencies": {
+    "@angular/animations": "file:../../dist/packages-dist/animations",
+    "@angular/common": "file:../../dist/packages-dist/common",
+    "@angular/compiler": "file:../../dist/packages-dist/compiler",
+    "@angular/compiler-cli": "file:../../dist/packages-dist/compiler-cli",
+    "@angular/core": "file:../../dist/packages-dist/core",
+    "@angular/elements": "file:../../dist/packages-dist/elements",
+    "@angular/forms": "file:../../dist/packages-dist/forms",
+    "@angular/platform-browser": "file:../../dist/packages-dist/platform-browser",
+    "@angular/platform-browser-dynamic": "file:../../dist/packages-dist/platform-browser-dynamic",
+    "@angular/platform-server": "file:../../dist/packages-dist/platform-server",
+    "@angular/router": "file:../../dist/packages-dist/router",
+    "@angular/service-worker": "file:../../dist/packages-dist/service-worker",
+    "@angular/upgrade": "file:../../dist/packages-dist/upgrade",
+    "@types/jasmine": "file:../../node_modules/@types/jasmine",
+    "rxjs": "file:../../node_modules/rxjs",
+    "typescript": "4.2.3",
+    "zone.js": "file:../../dist/zone.js-dist/archive/zone.js.tgz"
+  },
+  "scripts": {
+    "test": "tsc"
+  }
+}

integration/typings_test_ts42/tsconfig.json

@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "forceConsistentCasingInFileNames": true,
+    "strict": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+    "experimentalDecorators": true,
+    "module": "commonjs",
+    "moduleResolution": "node",
+    "outDir": "./dist/out-tsc",
+    "rootDir": ".",
+    "target": "es5",
+    "lib": [
+      "es5",
+      "dom",
+      "es2015.collection",
+      "es2015.iterable",
+      "es2015.promise"
+    ],
+    "types": [],
+  },
+  "files": [
+    "include-all.ts",
+    "node_modules/@types/jasmine/index.d.ts"
+  ]
+}

package.json

@@ -152,9 +152,9 @@
     "systemjs": "0.18.10",
     "terser": "^4.4.0",
     "tsickle": "0.38.1",
-    "tslib": "^2.0.0",
+    "tslib": "^2.1.0",
     "tslint": "6.1.3",
-    "typescript": "~4.1.2",
+    "typescript": "~4.2.3",
     "xhr2": "0.2.0",
     "yaml": "^1.10.0",
     "yargs": "^16.1.1"

packages/animations/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER"

packages/bazel/package.json

@@ -28,7 +28,7 @@
     "@angular/compiler-cli": "0.0.0-PLACEHOLDER",
     "@bazel/typescript": ">=1.0.0",
     "terser": "^4.3.1",
-    "typescript": ">=4.0 <4.2",
+    "typescript": ">=4.0 <4.3",
     "rollup": ">=1.20.0",
     "rollup-plugin-commonjs": ">=9.0.0",
     "rollup-plugin-node-resolve": ">=4.2.0",

packages/common/package.json

@@ -6,7 +6,7 @@
   "license": "MIT",
   "locales": "locales",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/compiler-cli/package.json

@@ -24,12 +24,12 @@
     "semver": "^6.3.0",
     "source-map": "^0.6.1",
     "sourcemap-codec": "^1.4.8",
-    "tslib": "^2.0.0",
+    "tslib": "^2.1.0",
     "yargs": "^16.1.1"
   },
   "peerDependencies": {
     "@angular/compiler": "0.0.0-PLACEHOLDER",
-    "typescript": ">=4.0 <4.2"
+    "typescript": ">=4.0 <4.3"
   },
   "engines": {
     "node": ">=10.0"

packages/compiler-cli/src/ngtsc/typecheck/test/span_comments_spec.ts

@@ -116,15 +116,14 @@ describe('type check blocks diagnostics', () => {
     it('should annotate safe property access', () => {
       const TEMPLATE = `{{ a?.b }}`;
       expect(tcbWithSpans(TEMPLATE))
-          .toContain(
+          .toContain('(null as any ? (((ctx).a /*3,4*/) /*3,4*/)!.b /*6,7*/ : undefined) /*3,7*/');
-              '((null as any) ? (((ctx).a /*3,4*/) /*3,4*/)!.b /*6,7*/ : undefined) /*3,7*/');
     });
 
     it('should annotate safe method calls', () => {
       const TEMPLATE = `{{ a?.method(b) }}`;
       expect(tcbWithSpans(TEMPLATE))
           .toContain(
-              '((null as any) ? (((ctx).a /*3,4*/) /*3,4*/)!.method /*6,12*/(((ctx).b /*13,14*/) /*13,14*/) : undefined) /*3,15*/');
+              '(null as any ? (((ctx).a /*3,4*/) /*3,4*/)!.method /*6,12*/(((ctx).b /*13,14*/) /*13,14*/) : undefined) /*3,15*/');
     });
 
     it('should annotate $any casts', () => {

packages/compiler-cli/src/ngtsc/typecheck/test/type_check_block_spec.ts

@@ -60,7 +60,7 @@ describe('type check blocks', () => {
       selector: '[dir]',
       inputs: {inputA: 'inputA'},
     }];
-    expect(tcb(TEMPLATE, DIRECTIVES)).toContain('_t1: DirA = (null!); _t1.inputA = ("value");');
+    expect(tcb(TEMPLATE, DIRECTIVES)).toContain('_t1: DirA = null!; _t1.inputA = ("value");');
   });
 
   it('should handle multiple bindings to the same property', () => {
@@ -135,7 +135,7 @@ describe('type check blocks', () => {
       }];
       expect(tcb(TEMPLATE, DIRECTIVES))
           .toContain(
-              'var _t1 = Dir.ngTypeCtor({ "fieldA": (((ctx).foo)), "fieldB": (null as any) });');
+              'var _t1 = Dir.ngTypeCtor({ "fieldA": (((ctx).foo)), "fieldB": null as any });');
     });
 
     it('should handle multiple bindings to the same property', () => {
@@ -261,7 +261,7 @@ describe('type check blocks', () => {
       }];
       expect(tcb(TEMPLATE, DIRECTIVES))
           .toContain(
-              'var _t1: typeof Dir.ngAcceptInputType_fieldA = (null!); ' +
+              'var _t1: typeof Dir.ngAcceptInputType_fieldA = null!; ' +
               '_t1 = (((ctx).foo));');
     });
   });
@@ -321,11 +321,11 @@ describe('type check blocks', () => {
       },
     ];
     const block = tcb(TEMPLATE, DIRECTIVES);
-    expect(block).toContain('var _t1: HasInput = (null!)');
+    expect(block).toContain('var _t1: HasInput = null!');
     expect(block).toContain('_t1.input = (((ctx).value));');
-    expect(block).toContain('var _t2: HasOutput = (null!)');
+    expect(block).toContain('var _t2: HasOutput = null!');
     expect(block).toContain('_t2["output"]');
-    expect(block).toContain('var _t4: HasReference = (null!)');
+    expect(block).toContain('var _t4: HasReference = null!');
     expect(block).toContain('var _t3 = _t4;');
     expect(block).toContain('(_t3).a');
     expect(block).not.toContain('NoBindings');
@@ -355,7 +355,7 @@ describe('type check blocks', () => {
     }];
     expect(tcb(TEMPLATE, DIRECTIVES))
         .toContain(
-            'var _t2: Dir = (null!); ' +
+            'var _t2: Dir = null!; ' +
             'var _t1 = _t2; ' +
             '"" + (((_t1).value));');
   });
@@ -383,7 +383,7 @@ describe('type check blocks', () => {
       inputs: {'color': 'color', 'strong': 'strong', 'enabled': 'enabled'},
     }];
     const block = tcb(TEMPLATE, DIRECTIVES);
-    expect(block).not.toContain('var _t1: Dir = (null!);');
+    expect(block).not.toContain('var _t1: Dir = null!;');
     expect(block).not.toContain('"color"');
     expect(block).not.toContain('"strong"');
     expect(block).not.toContain('"enabled"');
@@ -403,7 +403,7 @@ describe('type check blocks', () => {
     }];
     expect(tcb(TEMPLATE, DIRECTIVES))
         .toContain(
-            'var _t2: Dir = (null!); ' +
+            'var _t2: Dir = null!; ' +
             'var _t1 = _t2; ' +
             '_t2.input = (_t1);');
   });
@@ -431,9 +431,9 @@ describe('type check blocks', () => {
     ];
     expect(tcb(TEMPLATE, DIRECTIVES))
         .toContain(
-            'var _t2: DirB = (null!); ' +
+            'var _t2: DirB = null!; ' +
             'var _t1 = _t2; ' +
-            'var _t3: DirA = (null!); ' +
+            'var _t3: DirA = null!; ' +
             '_t3.inputA = (_t1); ' +
             'var _t4 = _t3; ' +
             '_t2.inputA = (_t4);');
@@ -451,7 +451,7 @@ describe('type check blocks', () => {
       undeclaredInputFields: ['fieldA']
     }];
     const block = tcb(TEMPLATE, DIRECTIVES);
-    expect(block).not.toContain('var _t1: Dir = (null!);');
+    expect(block).not.toContain('var _t1: Dir = null!;');
     expect(block).toContain('(((ctx).foo)); ');
   });
 
@@ -468,8 +468,8 @@ describe('type check blocks', () => {
     }];
     expect(tcb(TEMPLATE, DIRECTIVES))
         .toContain(
-            'var _t1: Dir = (null!); ' +
+            'var _t1: Dir = null!; ' +
-            'var _t2: typeof _t1["fieldA"] = (null!); ' +
+            'var _t2: typeof _t1["fieldA"] = null!; ' +
             '_t2 = (((ctx).foo)); ');
   });
 
@@ -487,7 +487,7 @@ describe('type check blocks', () => {
        }];
        const block = tcb(TEMPLATE, DIRECTIVES);
        expect(block).toContain(
-           'var _t1: Dir = (null!); ' +
+           'var _t1: Dir = null!; ' +
            '_t1["some-input.xs"] = (((ctx).foo)); ');
      });
 
@@ -504,7 +504,7 @@ describe('type check blocks', () => {
     }];
     expect(tcb(TEMPLATE, DIRECTIVES))
         .toContain(
-            'var _t1: Dir = (null!); ' +
+            'var _t1: Dir = null!; ' +
             '_t1.field2 = _t1.field1 = (((ctx).foo));');
   });
 
@@ -523,8 +523,8 @@ describe('type check blocks', () => {
        }];
        expect(tcb(TEMPLATE, DIRECTIVES))
            .toContain(
-               'var _t1: typeof Dir.ngAcceptInputType_field1 = (null!); ' +
+               'var _t1: typeof Dir.ngAcceptInputType_field1 = null!; ' +
-               'var _t2: Dir = (null!); ' +
+               'var _t2: Dir = null!; ' +
                '_t2.field2 = _t1 = (((ctx).foo));');
      });
 
@@ -543,7 +543,7 @@ describe('type check blocks', () => {
        }];
        expect(tcb(TEMPLATE, DIRECTIVES))
            .toContain(
-               'var _t1: Dir = (null!); ' +
+               'var _t1: Dir = null!; ' +
                '_t1.field2 = (((ctx).foo));');
      });
 
@@ -559,9 +559,9 @@ describe('type check blocks', () => {
       coercedInputFields: ['fieldA'],
     }];
     const block = tcb(TEMPLATE, DIRECTIVES);
-    expect(block).not.toContain('var _t1: Dir = (null!);');
+    expect(block).not.toContain('var _t1: Dir = null!;');
     expect(block).toContain(
-        'var _t1: typeof Dir.ngAcceptInputType_fieldA = (null!); ' +
+        'var _t1: typeof Dir.ngAcceptInputType_fieldA = null!; ' +
         '_t1 = (((ctx).foo));');
   });
 
@@ -578,9 +578,9 @@ describe('type check blocks', () => {
       undeclaredInputFields: ['fieldA'],
     }];
     const block = tcb(TEMPLATE, DIRECTIVES);
-    expect(block).not.toContain('var _t1: Dir = (null!);');
+    expect(block).not.toContain('var _t1: Dir = null!;');
     expect(block).toContain(
-        'var _t1: typeof Dir.ngAcceptInputType_fieldA = (null!); ' +
+        'var _t1: typeof Dir.ngAcceptInputType_fieldA = null!; ' +
         '_t1 = (((ctx).foo));');
   });
 
@@ -893,7 +893,7 @@ describe('type check blocks', () => {
             TypeCheckingConfig = {...BASE_CONFIG, checkTypeOfDomReferences: false};
         const block = tcb(TEMPLATE, [], DISABLED_CONFIG);
         expect(block).toContain(
-            'var _t1 = (_t2 as any); ' +
+            'var _t1 = _t2 as any; ' +
             '"" + (((_t1).value));');
       });
     });
@@ -928,7 +928,7 @@ describe('type check blocks', () => {
             TypeCheckingConfig = {...BASE_CONFIG, checkTypeOfNonDomReferences: false};
         const block = tcb(TEMPLATE, DIRECTIVES, DISABLED_CONFIG);
         expect(block).toContain(
-            'var _t1 = (_t2 as any); ' +
+            'var _t1 = _t2 as any; ' +
             '"" + (((_t1).value));');
       });
     });
@@ -983,8 +983,8 @@ describe('type check blocks', () => {
 
       it('should use undefined for safe navigation operations when enabled', () => {
         const block = tcb(TEMPLATE, DIRECTIVES);
-        expect(block).toContain('((null as any) ? (((ctx).a))!.method() : undefined)');
+        expect(block).toContain('(null as any ? (((ctx).a))!.method() : undefined)');
-        expect(block).toContain('((null as any) ? (((ctx).a))!.b : undefined)');
+        expect(block).toContain('(null as any ? (((ctx).a))!.b : undefined)');
       });
       it('should use an \'any\' type for safe navigation operations when disabled', () => {
         const DISABLED_CONFIG:
@@ -999,8 +999,8 @@ describe('type check blocks', () => {
       const TEMPLATE = `{{a.method()?.b}} {{a()?.method()}}`;
       it('should check the presence of a property/method on the receiver when enabled', () => {
         const block = tcb(TEMPLATE, DIRECTIVES);
-        expect(block).toContain('((null as any) ? ((((ctx).a)).method())!.b : undefined)');
+        expect(block).toContain('(null as any ? ((((ctx).a)).method())!.b : undefined)');
-        expect(block).toContain('((null as any) ? ((ctx).a())!.method() : undefined)');
+        expect(block).toContain('(null as any ? ((ctx).a())!.method() : undefined)');
       });
       it('should not check the presence of a property/method on the receiver when disabled', () => {
         const DISABLED_CONFIG:
@@ -1045,7 +1045,7 @@ describe('type check blocks', () => {
                TypeCheckingConfig = {...BASE_CONFIG, honorAccessModifiersForInputBindings: true};
            const block = tcb(TEMPLATE, DIRECTIVES, enableChecks);
            expect(block).toContain(
-               'var _t1: Dir = (null!); ' +
+               'var _t1: Dir = null!; ' +
                '_t1["some-input.xs"] = (((ctx).foo)); ');
          });
 
@@ -1063,7 +1063,7 @@ describe('type check blocks', () => {
             TypeCheckingConfig = {...BASE_CONFIG, honorAccessModifiersForInputBindings: true};
         const block = tcb(TEMPLATE, DIRECTIVES, enableChecks);
         expect(block).toContain(
-            'var _t1: Dir = (null!); ' +
+            'var _t1: Dir = null!; ' +
             '_t1.fieldA = (((ctx).foo)); ');
       });
     });

packages/compiler-cli/src/typescript_support.ts

@@ -25,7 +25,7 @@ const MIN_TS_VERSION = '4.0.0';
  * Note: this check is disabled in g3, search for
  * `angularCompilerOptions.disableTypeScriptVersionCheck` config param value in g3.
  */
-const MAX_TS_VERSION = '4.2.0';
+const MAX_TS_VERSION = '4.3.0';
 
 /**
  * The currently used version of TypeScript, which can be adjusted for testing purposes using

packages/compiler-cli/test/ngtsc/incremental_spec.ts

@@ -769,12 +769,14 @@ runInEachFileSystem(() => {
 
           let diags = env.driveDiagnostics();
           expect(diags.length).toBe(1);
-          expect(diags[0].messageText).toContain('"alpha" | "beta"');
+          expect(diags[0].messageText)
+              .toContain(`Type '"gamma"' is not assignable to type 'keyof Keys'.`);
 
           // On a rebuild, the same errors should be present.
           diags = env.driveDiagnostics();
           expect(diags.length).toBe(1);
-          expect(diags[0].messageText).toContain('"alpha" | "beta"');
+          expect(diags[0].messageText)
+              .toContain(`Type '"gamma"' is not assignable to type 'keyof Keys'.`);
         });
       });
     });

packages/compiler/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "repository": {
     "type": "git",

packages/core/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "rxjs": "^6.5.3",

packages/core/schematics/migrations/renderer-to-renderer2/index.ts

@@ -7,7 +7,7 @@
  */
 
 import {Rule, SchematicsException, Tree} from '@angular-devkit/schematics';
-import {relative} from 'path';
+import {basename, join, relative} from 'path';
 import * as ts from 'typescript';
 
 import {getProjectTsConfigPaths} from '../../utils/project_tsconfig_paths';
@@ -43,11 +43,15 @@ export default function(): Rule {
 }
 
 function runRendererToRenderer2Migration(tree: Tree, tsconfigPath: string, basePath: string) {
+  // Technically we can get away with using `MODULE_AUGMENTATION_FILENAME` as the path, but as of
+  // TS 4.2, the module resolution caching seems to be more aggressive which causes the file to be
+  // retained between test runs. We can avoid it by using the full path.
+  const augmentedFilePath = join(basePath, MODULE_AUGMENTATION_FILENAME);
   const {program} = createMigrationProgram(tree, tsconfigPath, basePath, fileName => {
     // In case the module augmentation file has been requested, we return a source file that
     // augments "@angular/core" to include a named export called "Renderer". This ensures that
     // we can rely on the type checker for this migration in v9 where "Renderer" has been removed.
-    if (fileName === MODULE_AUGMENTATION_FILENAME) {
+    if (basename(fileName) === MODULE_AUGMENTATION_FILENAME) {
       return `
         import '@angular/core';
         declare module "@angular/core" {
@@ -55,8 +59,8 @@ function runRendererToRenderer2Migration(tree: Tree, tsconfigPath: string, baseP
         }
       `;
     }
-    return null;
+    return undefined;
-  }, [MODULE_AUGMENTATION_FILENAME]);
+  }, [augmentedFilePath]);
   const typeChecker = program.getTypeChecker();
   const printer = ts.createPrinter();
   const sourceFiles =

packages/core/schematics/migrations/wait-for-async/index.ts

@@ -7,7 +7,7 @@
  */
 
 import {Rule, SchematicsException, Tree} from '@angular-devkit/schematics';
-import {relative} from 'path';
+import {basename, join, relative} from 'path';
 import * as ts from 'typescript';
 
 import {getProjectTsConfigPaths} from '../../utils/project_tsconfig_paths';
@@ -38,11 +38,15 @@ export default function(): Rule {
 }
 
 function runWaitForAsyncMigration(tree: Tree, tsconfigPath: string, basePath: string) {
+  // Technically we can get away with using `MODULE_AUGMENTATION_FILENAME` as the path, but as of
+  // TS 4.2, the module resolution caching seems to be more aggressive which causes the file to be
+  // retained between test runs. We can avoid it by using the full path.
+  const augmentedFilePath = join(basePath, MODULE_AUGMENTATION_FILENAME);
   const {program} = createMigrationProgram(tree, tsconfigPath, basePath, fileName => {
     // In case the module augmentation file has been requested, we return a source file that
     // augments "@angular/core/testing" to include a named export called "async". This ensures that
     // we can rely on the type checker for this migration after `async` has been removed.
-    if (fileName === MODULE_AUGMENTATION_FILENAME) {
+    if (basename(fileName) === MODULE_AUGMENTATION_FILENAME) {
       return `
         import '@angular/core/testing';
         declare module "@angular/core/testing" {
@@ -50,8 +54,8 @@ function runWaitForAsyncMigration(tree: Tree, tsconfigPath: string, basePath: st
         }
       `;
     }
-    return null;
+    return undefined;
-  }, [MODULE_AUGMENTATION_FILENAME]);
+  }, [augmentedFilePath]);
   const typeChecker = program.getTypeChecker();
   const printer = ts.createPrinter();
   const sourceFiles =

packages/core/schematics/test/static_queries_migration_usage_spec.ts

@@ -683,13 +683,13 @@ describe('static-queries migration with usage strategy', () => {
     it('should not mark queries used in promises as static', async () => {
       writeFile('/es2015.dom.d.ts', `
         interface PromiseConstructor {
-          resolve(): Promise;
+          resolve(): Promise<unknown>;
-          reject(): Promise;
+          reject(): Promise<unknown>;
         }
 
         interface Promise {
-          then(cb: Function): Promise;
+          then(cb: Function): Promise<unknown>;
-          catch(cb: Function): Promise;
+          catch(cb: Function): Promise<unknown>;
         }
 
         declare var Promise: PromiseConstructor;

packages/core/schematics/test/undecorated_classes_with_di_migration_spec.ts

@@ -1484,7 +1484,10 @@ describe('Undecorated classes with DI migration', () => {
                {flatModuleId: 'AUTOGENERATED', flatModuleOutFile: 'AUTOGENERATED'}
          }));
 
-         writeFile('/second.ts', ``);
+         // This file doesn't do anything, but it's necessary in order to hit the code path for
+         // the assertion. As of TS 4.2 it needs to have _some_ kind of content, otherwise the
+         // compiler will throw an error.
+         writeFile('/second.ts', `export const foo = 1;`);
          writeFile('/test.ts', `
         import {Injectable, NgModule, NgZone} from '@angular/core';
 

packages/core/schematics/utils/typescript/compiler_host.ts

@@ -10,7 +10,7 @@ import {dirname, relative, resolve} from 'path';
 import * as ts from 'typescript';
 import {parseTsconfigFile} from './parse_tsconfig';
 
-export type FakeReadFileFn = (fileName: string) => string|null;
+export type FakeReadFileFn = (fileName: string) => string|undefined;
 
 /**
  * Creates a TypeScript program instance for a TypeScript project within
@@ -40,6 +40,7 @@ export function createMigrationCompilerHost(
     tree: Tree, options: ts.CompilerOptions, basePath: string,
     fakeRead?: FakeReadFileFn): ts.CompilerHost {
   const host = ts.createCompilerHost(options, true);
+  const defaultReadFile = host.readFile;
 
   // We need to overwrite the host "readFile" method, as we want the TypeScript
   // program to be based on the file contents in the virtual file tree. Otherwise
@@ -47,12 +48,19 @@ export function createMigrationCompilerHost(
   // source files.
   host.readFile = fileName => {
     const treeRelativePath = relative(basePath, fileName);
-    const fakeOutput = fakeRead ? fakeRead(treeRelativePath) : null;
+    let result: string|undefined = fakeRead?.(treeRelativePath);
-    const buffer = fakeOutput === null ? tree.read(treeRelativePath) : fakeOutput;
+
+    if (result === undefined) {
+      // If the relative path resolved to somewhere outside of the tree, fall back to
+      // TypeScript's default file reading function since the `tree` will throw an error.
+      result = treeRelativePath.startsWith('..') ? defaultReadFile.call(host, fileName) :
+                                                   tree.read(treeRelativePath)?.toString();
+    }
+
     // Strip BOM as otherwise TSC methods (Ex: getWidth) will return an offset,
     // which breaks the CLI UpdateRecorder.
     // See: https://github.com/angular/angular/pull/30719
-    return buffer ? buffer.toString().replace(/^\uFEFF/, '') : undefined;
+    return result ? result.replace(/^\uFEFF/, '') : undefined;
   };
 
   return host;

packages/elements/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/forms/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/language-service/ivy/test/quick_info_spec.ts

@@ -216,7 +216,7 @@ describe('quick info', () => {
             templateOverride: `<div *ngFor="let item o¦f heroes; trackBy: trackByFn;"></div>`,
             expectedSpanText: 'of',
             expectedDisplayString:
-                '(property) NgForOf<Hero, Hero[]>.ngForOf: Hero[] | (Hero[] & Iterable<Hero>) | null | undefined'
+                '(property) NgForOf<Hero, Hero[]>.ngForOf: (Hero[] & NgIterable<Hero>) | null | undefined'
           });
         });
 

packages/language-service/test/diagnostics_spec.ts

@@ -830,8 +830,7 @@ describe('diagnostics', () => {
     const tsDiags = tsLS.getSemanticDiagnostics(APP_COMPONENT);
     expect(tsDiags.length).toBe(1);
     expect(tsDiags[0].messageText)
-        .toBe(
+        .toBe(`Module '"@angular/core"' has no exported member 'OpaqueToken'.`);
-            `Module '"../node_modules/@angular/core/core"' has no exported member 'OpaqueToken'.`);
   });
 
   describe('templates', () => {

packages/platform-browser-dynamic/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/platform-browser/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/animations": "0.0.0-PLACEHOLDER",

packages/platform-browser/test/browser/transfer_state_spec.ts

@@ -9,7 +9,7 @@
 import {DOCUMENT} from '@angular/common';
 import {TestBed} from '@angular/core/testing';
 import {BrowserModule, BrowserTransferStateModule, TransferState} from '@angular/platform-browser';
-import {escapeHtml, makeStateKey, StateKey, unescapeHtml} from '@angular/platform-browser/src/browser/transfer_state';
+import {escapeHtml, makeStateKey, unescapeHtml} from '@angular/platform-browser/src/browser/transfer_state';
 
 (function() {
 function removeScriptTag(doc: Document, id: string) {
@@ -37,6 +37,7 @@ describe('TransferState', () => {
   let doc: Document;
 
   const TEST_KEY = makeStateKey<number>('test');
+  const BOOLEAN_KEY = makeStateKey<boolean>('boolean');
   const DELAYED_KEY = makeStateKey<string>('delayed');
 
   beforeEach(() => {
@@ -80,9 +81,9 @@ describe('TransferState', () => {
 
   it('supports setting and accessing value \'false\' via get', () => {
     const transferState: TransferState = TestBed.inject(TransferState);
-    transferState.set(TEST_KEY, false);
+    transferState.set(BOOLEAN_KEY, false);
-    expect(transferState.get(TEST_KEY, true)).toBe(false);
+    expect(transferState.get(BOOLEAN_KEY, true)).toBe(false);
-    expect(transferState.hasKey(TEST_KEY)).toBe(true);
+    expect(transferState.hasKey(BOOLEAN_KEY)).toBe(true);
   });
 
   it('supports setting and accessing value \'null\' via get', () => {

packages/platform-server/package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "domino": "^2.1.2",
-    "tslib": "^2.0.0",
+    "tslib": "^2.1.0",
     "xhr2": "^0.2.0"
   },
   "repository": {

packages/router/package.json

@@ -18,7 +18,7 @@
   },
   "homepage": "https://github.com/angular/angular/tree/master/packages/router",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/service-worker/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/upgrade/package.json

@@ -5,7 +5,7 @@
   "author": "angular",
   "license": "MIT",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "peerDependencies": {
     "@angular/core": "0.0.0-PLACEHOLDER",

packages/zone.js/package.json

@@ -8,7 +8,7 @@
   "fesm2015": "./fesm2015/zone.js",
   "typings": "./zone.d.ts",
   "dependencies": {
-    "tslib": "^2.0.0"
+    "tslib": "^2.1.0"
   },
   "devDependencies": {
     "@externs/nodejs": "^1.5.0",
@@ -19,7 +19,7 @@
     "mocha": "^3.1.2",
     "mock-require": "3.0.3",
     "promises-aplus-tests": "^2.1.2",
-    "typescript": "4.1.2"
+    "typescript": "4.2.3"
   },
   "scripts": {
     "closuretest": "./scripts/closure/closure_compiler.sh",

packages/zone.js/test/browser/FileReader.spec.ts

@@ -17,8 +17,8 @@ describe('FileReader', ifEnvSupports('FileReader', function() {
 
            // Android 4.3's native browser doesn't implement add/RemoveEventListener for FileReader
            function supportsEventTargetFns() {
-             return FileReader.prototype.addEventListener &&
+             return !!FileReader.prototype.addEventListener &&
-                 FileReader.prototype.removeEventListener;
+                 !!FileReader.prototype.removeEventListener;
            }
            (<any>supportsEventTargetFns).message =
                'FileReader#addEventListener and FileReader#removeEventListener';

packages/zone.js/test/typings/package.json

@@ -14,6 +14,6 @@
     "zone.js": "file:../../../../dist/bin/packages/zone.js/npm_package"
   },
   "devDependencies": {
-    "typescript": "~4.1.2"
+    "typescript": "~4.2.3"
   }
 }

packages/zone.js/yarn.lock

@@ -3745,10 +3745,10 @@ tr46@^2.0.2:
   dependencies:
     punycode "^2.1.1"
 
-tslib@^2.0.0:
+tslib@^2.1.0:
-  version "2.0.1"
+  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.0.1.tgz#410eb0d113e5b6356490eec749603725b021b43e"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"
-  integrity sha512-SgIkNheinmEBgx1IUNirK0TUD4X9yjjBRTqqjggWCU3pUEqIk3/Uwl3yRixYKT6WjQuGiwDv4NomL3wqRCj+CQ==
+  integrity sha512-hcVC3wYEziELGGmEEXue7D75zbwIIVUMWAVbHItGPx0ziyXxrOMQx4rQEVEV45Ut/1IotuEvwqPopzIOkDMf0A==
 
 tunnel-agent@^0.6.0:
   version "0.6.0"
@@ -3786,10 +3786,10 @@ typedarray-to-buffer@^3.1.5:
   dependencies:
     is-typedarray "^1.0.0"
 
-typescript@4.1.2:
+typescript@4.2.3:
-  version "4.1.2"
+  version "4.2.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.2.tgz#6369ef22516fe5e10304aae5a5c4862db55380e9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
-  integrity sha512-thGloWsGH3SOxv1SoY7QojKi0tc+8FnOmiarEGMbd/lar7QOEd3hvlx3Fp5y6FlDUGl9L+pd4n2e+oToGMmhRQ==
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
 
 underscore@~1.8.3:
   version "1.8.3"

tools/ts-api-guardian/package.json

@@ -27,7 +27,7 @@
     "chai": "^4.1.2",
     "jasmine": "^3.1.0",
     "source-map-support": "^0.5.9",
-    "typescript": "4.1.2"
+    "typescript": "4.2.3"
   },
   "keywords": [
     "typescript"

yarn.lock

@@ -15262,10 +15262,10 @@ tslib@^1.13.0:
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-1.13.0.tgz#c881e13cc7015894ed914862d276436fa9a47043"
   integrity sha512-i/6DQjL8Xf3be4K/E6Wgpekn5Qasl1usyw++dAA35Ue5orEn65VIxOA+YvNNl9HV3qv70T7CNwjODHZrLwvd1Q==
 
-tslib@^2.0.0:
+tslib@^2.1.0:
-  version "2.0.0"
+  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.0.0.tgz#18d13fc2dce04051e20f074cc8387fd8089ce4f3"
+  resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.1.0.tgz#da60860f1c2ecaa5703ab7d39bc05b6bf988b97a"
-  integrity sha512-lTqkx847PI7xEDYJntxZH89L2/aXInsyF2luSafe/+0fHOMjlBNXdH6th7f70qxLDhul7KZK0zC8V5ZIyHl0/g==
+  integrity sha512-hcVC3wYEziELGGmEEXue7D75zbwIIVUMWAVbHItGPx0ziyXxrOMQx4rQEVEV45Ut/1IotuEvwqPopzIOkDMf0A==
 
 tslint-eslint-rules@5.4.0:
   version "5.4.0"
@@ -15445,10 +15445,10 @@ typescript@~3.7.2:
   resolved "https://registry.yarnpkg.com/typescript/-/typescript-3.7.5.tgz#0692e21f65fd4108b9330238aac11dd2e177a1ae"
   integrity sha512-/P5lkRXkWHNAbcJIiHPfRoKqyd7bsyCma1hZNUGfn20qm64T6ZBlrzprymeu918H+mB/0rIg2gGK/BXkhhYgBw==
 
-typescript@~4.1.2:
+typescript@~4.2.3:
-  version "4.1.2"
+  version "4.2.3"
-  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.1.2.tgz#6369ef22516fe5e10304aae5a5c4862db55380e9"
+  resolved "https://registry.yarnpkg.com/typescript/-/typescript-4.2.3.tgz#39062d8019912d43726298f09493d598048c1ce3"
-  integrity sha512-thGloWsGH3SOxv1SoY7QojKi0tc+8FnOmiarEGMbd/lar7QOEd3hvlx3Fp5y6FlDUGl9L+pd4n2e+oToGMmhRQ==
+  integrity sha512-qOcYwxaByStAWrBf4x0fibwZvMRG+r4cQoTjbPtUlrWjBHbmCAww1i448U0GJ+3cNNEtebDteo/cHOR3xJ4wEw==
 
 uglify-js@^1.3.3:
   version "1.3.5"