chore: migrate @jest/core to TypeScript (#7998)

Author: SimenB

CHANGELOG.md

@@ -77,6 +77,7 @@
 - `[jest-repl]`: Migrate to TypeScript ([#8000](https://github.com/facebook/jest/pull/8000))
 - `[jest-validate]`: Migrate to TypeScript ([#7991](https://github.com/facebook/jest/pull/7991))
 - `[docs]`: Update CONTRIBUTING.md to add information about running jest with `jest-circus` locally ([#8013](https://github.com/facebook/jest/pull/8013)).
+- `[@jest/core]`: Migrate to TypeScript ([#7998](https://github.com/facebook/jest/pull/7998))
 
 ### Performance
 

packages/jest-changed-files/src/index.ts

@@ -15,6 +15,8 @@ import hg from './hg';
 
 type RootPromise = ReturnType<SCMAdapter['getRoot']>;
 
+export {ChangedFiles, ChangedFilesPromise} from './types';
+
 function notEmpty<T>(value: T | null | undefined): value is T {
   return value != null;
 }

packages/jest-changed-files/src/types.ts

@@ -14,12 +14,10 @@ export type Options = {
   includePaths?: Array<Config.Path>;
 };
 
-type ChangedFiles = Set<Config.Path>;
-export type Repos = {git: ChangedFiles; hg: ChangedFiles};
-export type ChangedFilesPromise = Promise<{
-  repos: Repos;
-  changedFiles: ChangedFiles;
-}>;
+type Paths = Set<Config.Path>;
+export type Repos = {git: Paths; hg: Paths};
+export type ChangedFiles = {repos: Repos; changedFiles: Paths};
+export type ChangedFilesPromise = Promise<ChangedFiles>;
 
 export type SCMAdapter = {
   findChangedFiles: (

packages/jest-core/package.json

@@ -4,6 +4,7 @@
   "version": "24.1.0",
   "main": "build/jest.js",
   "dependencies": {
+    "@jest/types": "^24.1.0",
     "@jest/reporters": "^24.1.0",
     "@jest/transform": "^24.1.0",
     "ansi-escapes": "^3.0.0",
@@ -24,7 +25,7 @@
     "jest-watcher": "^24.0.0",
     "micromatch": "^3.1.10",
     "p-each-series": "^1.0.0",
-    "pirates": "^4.0.0",
+    "pirates": "^4.0.1",
     "realpath-native": "^1.1.0",
     "rimraf": "^2.5.4",
     "strip-ansi": "^5.0.0"

packages/jest-core/src/FailedTestsCache.js renamed to packages/jest-core/src/FailedTestsCache.ts

@@ -3,45 +3,49 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- * @flow
  */
 
-import type {Test} from 'types/TestRunner';
-import type {TestResult} from 'types/TestResult';
-import type {GlobalConfig} from 'types/Config';
+import {Test} from 'jest-runner';
+import {Config, TestResult} from '@jest/types';
+
+type TestMap = {[key: string]: {[key: string]: boolean}};
 
 export default class FailedTestsCache {
-  _enabledTestsMap: ?{[key: string]: {[key: string]: boolean}};
+  private _enabledTestsMap?: TestMap;
 
   filterTests(tests: Array<Test>): Array<Test> {
-    if (!this._enabledTestsMap) {
+    const enabledTestsMap = this._enabledTestsMap;
+
+    if (!enabledTestsMap) {
       return tests;
     }
-    // $FlowFixMe
-    return tests.filter(testResult => this._enabledTestsMap[testResult.path]);
+    return tests.filter(testResult => enabledTestsMap[testResult.path]);
   }
 
-  setTestResults(testResults: Array<TestResult>) {
+  setTestResults(testResults: Array<TestResult.TestResult>) {
     this._enabledTestsMap = (testResults || [])
       .filter(testResult => testResult.numFailingTests)
-      .reduce((suiteMap, testResult) => {
+      .reduce<TestMap>((suiteMap, testResult) => {
         suiteMap[testResult.testFilePath] = testResult.testResults
           .filter(test => test.status === 'failed')
-          .reduce((testMap, test) => {
-            testMap[test.fullName] = true;
-            return testMap;
-          }, {});
+          .reduce(
+            (testMap, test) => {
+              testMap[test.fullName] = true;
+              return testMap;
+            },
+            {} as {[name: string]: true},
+          );
         return suiteMap;
       }, {});
+
     this._enabledTestsMap = Object.freeze(this._enabledTestsMap);
   }
 
-  updateConfig(globalConfig: GlobalConfig): GlobalConfig {
+  updateConfig(globalConfig: Config.GlobalConfig): Config.GlobalConfig {
     if (!this._enabledTestsMap) {
       return globalConfig;
     }
-    const newConfig: GlobalConfig = {...globalConfig};
+    const newConfig: Config.GlobalConfig = {...globalConfig};
     newConfig.enabledTestsMap = this._enabledTestsMap;
     return Object.freeze(newConfig);
   }

packages/jest-core/src/ReporterDispatcher.js renamed to packages/jest-core/src/ReporterDispatcher.ts

@@ -3,23 +3,15 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
- *
- * @flow
  */
 
-import type {Context} from 'types/Context';
-import type {Reporter, Test} from 'types/TestRunner';
-import type {TestResult, AggregatedResult} from 'types/TestResult';
-import type {ReporterOnStartOptions} from 'types/Reporters';
-
-export type RunOptions = {|
-  estimatedTime: number,
-  showStatus: boolean,
-|};
+import {TestResult} from '@jest/types';
+import {Test} from 'jest-runner';
+import {Context} from 'jest-runtime';
+import {Reporter, ReporterOnStartOptions} from './types';
 
 export default class ReporterDispatcher {
-  _disabled: boolean;
-  _reporters: Array<Reporter>;
+  private _reporters: Array<Reporter>;
 
   constructor() {
     this._reporters = [];
@@ -37,8 +29,8 @@ export default class ReporterDispatcher {
 
   async onTestResult(
     test: Test,
-    testResult: TestResult,
-    results: AggregatedResult,
+    testResult: TestResult.TestResult,
+    results: TestResult.AggregatedResult,
   ) {
     for (const reporter of this._reporters) {
       reporter.onTestResult &&
@@ -52,13 +44,19 @@ export default class ReporterDispatcher {
     }
   }
 
-  async onRunStart(results: AggregatedResult, options: ReporterOnStartOptions) {
+  async onRunStart(
+    results: TestResult.AggregatedResult,
+    options: ReporterOnStartOptions,
+  ) {
     for (const reporter of this._reporters) {
       reporter.onRunStart && (await reporter.onRunStart(results, options));
     }
   }
 
-  async onRunComplete(contexts: Set<Context>, results: AggregatedResult) {
+  async onRunComplete(
+    contexts: Set<Context>,
+    results: TestResult.AggregatedResult,
+  ) {
     for (const reporter of this._reporters) {
       reporter.onRunComplete &&
         (await reporter.onRunComplete(contexts, results));
@@ -67,7 +65,7 @@ export default class ReporterDispatcher {
 
   // Return a list of last errors for every reporter
   getErrors(): Array<Error> {
-    return this._reporters.reduce((list, reporter) => {
+    return this._reporters.reduce<Array<Error>>((list, reporter) => {
       const error = reporter.getLastError && reporter.getLastError();
       return error ? list.concat(error) : list;
     }, []);