chore(lint): enable recommended configs

.eslintrc.cjs

@@ -5,6 +5,8 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+/* eslint-disable sort-keys */
+
 const fs = require('fs');
 const path = require('path');
 const {sync: readPkg} = require('read-pkg');
@@ -27,6 +29,7 @@ module.exports = {
     'jest/globals': true,
   },
   extends: [
+    'eslint:recommended',
     'plugin:markdown/recommended',
     'plugin:import/errors',
     'plugin:eslint-comments/recommended',
@@ -38,6 +41,7 @@ module.exports = {
   overrides: [
     {
       extends: [
+        'plugin:@typescript-eslint/recommended',
         'plugin:@typescript-eslint/eslint-recommended',
         'plugin:import/typescript',
       ],
@@ -52,10 +56,14 @@ module.exports = {
           {argsIgnorePattern: '^_'},
         ],
         '@typescript-eslint/prefer-ts-expect-error': 'error',
+        '@typescript-eslint/no-var-requires': 'off',
         // TS verifies these
         'consistent-return': 'off',
         'no-dupe-class-members': 'off',
         'no-unused-vars': 'off',
+        // TODO: enable at some point
+        '@typescript-eslint/no-explicit-any': 'off',
+        '@typescript-eslint/no-non-null-assertion': 'off',
       },
     },
     {
@@ -144,6 +152,9 @@ module.exports = {
       files: ['**/*.md/**'],
       rules: {
         '@typescript-eslint/no-unused-vars': 'off',
+        '@typescript-eslint/no-empty-function': 'off',
+        '@typescript-eslint/no-namespace': 'off',
+        '@typescript-eslint/no-empty-interface': 'off',
         'arrow-body-style': 'off',
         'consistent-return': 'off',
         'import/export': 'off',
@@ -201,6 +212,13 @@ module.exports = {
         ],
       },
     },
+    {
+      files: ['**/__tests__/**', '**/__mocks__/**'],
+      rules: {
+        '@typescript-eslint/ban-ts-comment': 'off',
+        '@typescript-eslint/no-empty-function': 'off',
+      },
+    },
     {
       files: [
         '**/__tests__/**',
@@ -247,6 +265,12 @@ module.exports = {
         'import/no-extraneous-dependencies': 'off',
       },
     },
+    {
+      files: ['**/__typetests__/**'],
+      rules: {
+        '@typescript-eslint/no-empty-function': 'off',
+      },
+    },
     {
       files: [
         '**/__typetests__/**',

e2e/__tests__/multiProjectRunner.test.ts

@@ -49,7 +49,7 @@ test('can pass projects or global config', () => {
         getHasteName(filename) {
           return filename
             .substr(filename.lastIndexOf(path.sep) + 1)
-            .replace(/\.js$/, '');
+            .replace(/\\.js$/, '');
         },
       };
     `,
@@ -446,7 +446,7 @@ test('Does transform files with the corresponding project transformer', () => {
     'project1/jest.config.js': `
       module.exports = {
         rootDir: './',
-        transform: {'file\.js': './transformer.js'},
+        transform: {'file\\.js': './transformer.js'},
       };`,
     'project1/transformer.js': `
       module.exports = {
@@ -461,7 +461,7 @@ test('Does transform files with the corresponding project transformer', () => {
     'project2/jest.config.js': `
       module.exports = {
         rootDir: './',
-        transform: {'file\.js': './transformer.js'},
+        transform: {'file\\.js': './transformer.js'},
       };`,
     'project2/transformer.js': `
       module.exports = {

e2e/__tests__/runProgrammatically.test.ts

@@ -12,10 +12,10 @@ const dir = resolve(__dirname, '..', 'run-programmatically');
 
 test('run Jest programmatically cjs', () => {
   const {stdout} = run('node cjs.js --version', dir);
-  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[\-\S]*-dev$/);
+  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[-\S]*-dev$/);
 });
 
 test('run Jest programmatically esm', () => {
   const {stdout} = run('node index.js --version', dir);
-  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[\-\S]*-dev$/);
+  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[-\S]*-dev$/);
 });

e2e/__tests__/version.test.ts

@@ -22,7 +22,7 @@ test('works with jest.config.js', () => {
   });
 
   const {exitCode, stdout, stderr} = runJest(DIR, ['--version']);
-  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[\-\S]*-dev$/);
+  expect(stdout).toMatch(/\d{2}\.\d{1,2}\.\d{1,2}[-\S]*-dev$/);
   // Only version gets printed and nothing else
   expect(stdout.split(/\n/)).toHaveLength(1);
   expect(stderr).toBe('');

e2e/coverage-provider-v8/empty-sourcemap/types.ts

@@ -5,4 +5,5 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+// eslint-disable-next-line @typescript-eslint/no-empty-interface
 export interface obj {}

e2e/snapshot-escape/__tests__/snapshotEscapeRegex.js

@@ -6,7 +6,7 @@
  */
 'use strict';
 
-const regex = /\dd\ \s+ \w \\\[ \. blahzz.* [xyz]+/;
+const regex = /\dd \s+ \w \\\[ \. blahzz.* [xyz]+/;
 
 test('escape regex', () => expect(regex).toMatchSnapshot());
 

packages/babel-plugin-jest-hoist/src/index.ts

@@ -305,6 +305,7 @@ export default function jestHoist(): PluginObj<{
     },
     // in `post` to make sure we come after an import transform and can unshift above the `require`s
     post({path: program}) {
+      // eslint-disable-next-line @typescript-eslint/no-this-alias
       const self = this;
 
       visitBlock(program);

packages/expect/src/index.ts

@@ -64,6 +64,7 @@ export class JestAssertionError extends Error {
   matcherResult?: Omit<SyncExpectationResult, 'message'> & {message: string};
 }
 
+// eslint-disable-next-line @typescript-eslint/no-unnecessary-type-constraint
 const isPromise = <T extends any>(obj: any): obj is PromiseLike<T> =>
   !!obj &&
   (typeof obj === 'object' || typeof obj === 'function') &&

packages/jest-circus/src/index.ts

@@ -155,6 +155,7 @@ const test: Global.It = (() => {
         test.todo,
       );
     }
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
     return _addTest(testName, 'todo', false, () => {}, test.todo);
   };
 

packages/jest-circus/src/legacy-code-todo-rewrite/jestAdapterInit.ts

@@ -63,7 +63,7 @@ export const initialize = async ({
   }
   getRunnerState().maxConcurrency = globalConfig.maxConcurrency;
 
-  // @ts-expect-error
+  // @ts-expect-error: missing `concurrent` which is added later
   const globalsObject: Global.TestFrameworkGlobals = {
     ...globals,
     fdescribe: globals.describe.only,

packages/jest-circus/src/run.ts

@@ -52,6 +52,7 @@ const _runTestsForDescribeBlock = async (
         const promise = mutex(test.fn);
         // Avoid triggering the uncaught promise rejection handler in case the
         // test errors before being awaited on.
+        // eslint-disable-next-line @typescript-eslint/no-empty-function
         promise.catch(() => {});
         test.fn = () => promise;
       } catch (err) {

packages/jest-circus/src/types.ts

@@ -14,6 +14,7 @@ export const TEST_TIMEOUT_SYMBOL = Symbol.for('TEST_TIMEOUT_SYMBOL');
 export const LOG_ERRORS_BEFORE_RETRY = Symbol.for('LOG_ERRORS_BEFORE_RETRY');
 
 declare global {
+  // eslint-disable-next-line @typescript-eslint/no-namespace
   namespace NodeJS {
     interface Global {
       [STATE_SYM]: Circus.State;

packages/jest-cli/src/init/errors.ts

@@ -9,6 +9,7 @@ export class NotFoundPackageJsonError extends Error {
   constructor(rootDir: string) {
     super(`Could not find a "package.json" file in ${rootDir}`);
     this.name = '';
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
     Error.captureStackTrace(this, () => {});
   }
 }
@@ -20,6 +21,7 @@ export class MalformedPackageJsonError extends Error {
         'Fix it, and then run "jest --init"',
     );
     this.name = '';
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
     Error.captureStackTrace(this, () => {});
   }
 }

packages/jest-config/src/utils.ts

@@ -52,7 +52,7 @@ export const resolve = (
 };
 
 export const escapeGlobCharacters = (path: string): string =>
-  path.replace(/([()*{}\[\]!?\\])/g, '\\$1');
+  path.replace(/([()*{}[\]!?\\])/g, '\\$1');
 
 export const replaceRootDirInPath = (
   rootDir: string,

packages/jest-console/src/NullConsole.ts

@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-empty-function */
 /**
  * Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
  *

packages/jest-core/src/cli/index.ts

@@ -105,6 +105,7 @@ export async function runCLI(
     // If in watch mode, return the promise that will never resolve.
     // If the watch mode is interrupted, watch should handle the process
     // shutdown.
+    // eslint-disable-next-line @typescript-eslint/no-empty-function
     return new Promise(() => {});
   }
 

packages/jest-environment-jsdom/src/index.ts

@@ -142,6 +142,7 @@ export default class JSDOMEnvironment implements JestEnvironment<number> {
     });
   }
 
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
   async setup(): Promise<void> {}
 
   async teardown(): Promise<void> {
@@ -165,7 +166,7 @@ export default class JSDOMEnvironment implements JestEnvironment<number> {
       Object.defineProperty(this.global, 'document', {value: null});
     }
     this.errorEventListener = null;
-    // @ts-expect-error
+    // @ts-expect-error: this.global not allowed to be `null`
     this.global = null;
     this.dom = null;
     this.fakeTimers = null;

packages/jest-environment-node/src/index.ts

@@ -77,7 +77,7 @@ export default class NodeEnvironment implements JestEnvironment<Timer> {
           configurable: descriptor.configurable,
           enumerable: descriptor.enumerable,
           get() {
-            // @ts-expect-error
+            // @ts-expect-error: no index signature
             const val = globalThis[nodeGlobalsKey];
 
             // override lazy getter
@@ -157,6 +157,7 @@ export default class NodeEnvironment implements JestEnvironment<Timer> {
     });
   }
 
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
   async setup(): Promise<void> {}
 
   async teardown(): Promise<void> {

packages/jest-fake-timers/src/modernFakeTimers.ts

@@ -80,7 +80,7 @@ export default class FakeTimers {
 
   runAllTicks(): void {
     if (this._checkFakeTimers()) {
-      // @ts-expect-error
+      // @ts-expect-error - doesn't exist?
       this._clock.runMicrotasks();
     }
   }

packages/jest-haste-map/src/watchers/FSEventsWatcher.ts

@@ -14,7 +14,7 @@ import micromatch = require('micromatch');
 // @ts-expect-error no types
 import walker from 'walker';
 
-// eslint-disable-next-line @typescript-eslint/prefer-ts-expect-error
+// eslint-disable-next-line @typescript-eslint/prefer-ts-expect-error, @typescript-eslint/ban-ts-comment
 // @ts-ignore: this is for CI which runs linux and might not have this
 let fsevents: typeof import('fsevents') | null = null;
 try {

packages/jest-jasmine2/src/PCancelable.ts

@@ -17,6 +17,7 @@ export default class PCancelable<T> implements PromiseLike<T> {
   private _canceled = false;
   private _promise: Promise<T>;
   private _cancel?: () => void;
+  // eslint-disable-next-line @typescript-eslint/no-empty-function
   private _reject: (reason?: unknown) => void = () => {};
 
   constructor(

packages/jest-jasmine2/src/errorOnPrivate.ts

@@ -52,7 +52,7 @@ export function installErrorOnPrivate(global: Global.Global): void {
   (
     Object.keys(disabledJasmineMethods) as Array<DisabledJasmineMethodsKeys>
   ).forEach(methodName => {
-    // @ts-expect-error
+    // @ts-expect-error - void unallowd, but it throws 🤷
     jasmine[methodName] = () => {
       throwAtFunction(disabledJasmineMethods[methodName], jasmine[methodName]);
     };

packages/jest-jasmine2/src/index.ts

@@ -64,7 +64,7 @@ export default async function jasmine2(
         if (stack.getFileName()?.startsWith(jestEachBuildDir)) {
           stack = getCallsite(4, sourcemaps);
         }
-        // @ts-expect-error
+        // @ts-expect-error: `it` is `void` for some reason
         it.result.__callsite = stack;
 
         return it;

packages/jest-jasmine2/src/jasmine/Env.ts

@@ -599,6 +599,7 @@ export default function jasmineEnv(j$: Jasmine) {
 
         const spec = specFactory(
           description,
+          // eslint-disable-next-line @typescript-eslint/no-empty-function
           () => {},
           currentDeclarationSuite,
         );

packages/jest-jasmine2/src/jasmine/JsApiReporter.ts

@@ -28,7 +28,7 @@ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
-/* eslint-disable sort-keys */
+/* eslint-disable sort-keys, @typescript-eslint/no-empty-function */
 import type {Reporter, RunDetails} from '../types';
 import type {SpecResult} from './Spec';
 import type {SuiteResult} from './Suite';

packages/jest-jasmine2/src/jasmine/ReportDispatcher.ts

@@ -40,17 +40,17 @@ export default class ReportDispatcher implements Reporter {
   provideFallbackReporter: (reporter: Reporter) => void;
   clearReporters: () => void;
 
-  // @ts-expect-error
+  // @ts-expect-error: confused by loop in ctor
   jasmineDone: (runDetails: RunDetails) => void;
-  // @ts-expect-error
+  // @ts-expect-error: confused by loop in ctor
   jasmineStarted: (runDetails: RunDetails) => void;
-  // @ts-expect-error
+  // @ts-expect-error: confused by loop in ctor
   specDone: (result: SpecResult) => void;
-  // @ts-expect-error
+  // @ts-expect-error: confused by loop in ctor
   specStarted: (spec: SpecResult) => void;
-  // @ts-expect-error
+  // @ts-expect-error: confused by loop in ctor
   suiteDone: (result: SuiteResult) => void;
-  // @ts-expect-error
+  // @ts-expect-error: confused by loop in ctor
   suiteStarted: (result: SuiteResult) => void;
 
   constructor(methods: Array<keyof Reporter>) {
@@ -89,7 +89,7 @@ export default class ReportDispatcher implements Reporter {
       for (let i = 0; i < reporters.length; i++) {
         const reporter = reporters[i];
         if (reporter[method]) {
-          // @ts-expect-error
+          // @ts-expect-error: wrong context
           reporter[method].apply(reporter, args);
         }
       }

packages/jest-jasmine2/src/jasmine/Spec.ts

@@ -28,7 +28,7 @@ LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
-/* eslint-disable sort-keys, local/prefer-spread-eventually, local/prefer-rest-params-eventually */
+/* eslint-disable sort-keys, local/prefer-spread-eventually, local/prefer-rest-params-eventually, @typescript-eslint/no-empty-function */
 
 import {AssertionError} from 'assert';
 import type {FailedAssertion, Milliseconds, Status} from '@jest/test-result';
@@ -138,11 +138,12 @@ export default class Spec {
     // in the stack in the Error object. This line stringifies the stack
     // property to allow garbage-collecting objects on the stack
     // https://crbug.com/v8/7142
+    // eslint-disable-next-line no-self-assign
     this.initError.stack = this.initError.stack;
 
     this.queueableFn.initError = this.initError;
 
-    // @ts-expect-error
+    // @ts-expect-error: misses some fields added later
     this.result = {
       id: this.id,
       description: this.description,
@@ -172,6 +173,7 @@ export default class Spec {
   }
 
   execute(onComplete?: () => void, enabled?: boolean) {
+    // eslint-disable-next-line @typescript-eslint/no-this-alias
     const self = this;
 
     this.onStart(this);
@@ -192,7 +194,7 @@ export default class Spec {
     this.currentRun = this.queueRunnerFactory({
       queueableFns: allFns,
       onException() {
-        // @ts-expect-error
+        // @ts-expect-error: wrong context
         self.onException.apply(self, arguments);
       },
       userContext: this.userContext(),