chore: fix some type errors in e2e tests

e2e/__tests__/coverageReport.test.ts

@@ -30,7 +30,7 @@ test('outputs coverage report', () => {
   //  with 0 % coverage.
   expect(wrap(stdout)).toMatchSnapshot();
 
-  expect(() => fs.accessSync(coverageDir, fs.F_OK)).not.toThrow();
+  expect(() => fs.accessSync(coverageDir, fs.constants.F_OK)).not.toThrow();
   expect(exitCode).toBe(0);
 });
 

e2e/__tests__/env.test.ts

@@ -5,9 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import runJest from '../runJest';
+import runJest, {RunJestResult} from '../runJest';
 
-const getLog = result => result.stdout.split('\n')[1].trim();
+const getLog = (result: RunJestResult) => result.stdout.split('\n')[1].trim();
 
 describe('Environment override', () => {
   it('uses jsdom when specified', () => {

e2e/__tests__/hasteMapMockChanged.test.ts

@@ -6,7 +6,7 @@
  */
 
 import * as path from 'path';
-import JestHasteMap from 'jest-haste-map';
+import JestHasteMap = require('jest-haste-map');
 import {cleanup, writeFiles} from '../Utils';
 
 // Directory must be here for Watchman to be enabled.

e2e/__tests__/hasteMapSha1.test.ts

@@ -7,7 +7,7 @@
 
 import {tmpdir} from 'os';
 import * as path from 'path';
-import JestHasteMap from 'jest-haste-map';
+import JestHasteMap = require('jest-haste-map');
 import {cleanup, writeFiles} from '../Utils';
 
 const DIR = path.resolve(tmpdir(), 'haste_map_sha1');

e2e/__tests__/jsonReporter.test.ts

@@ -7,6 +7,7 @@
 
 import * as fs from 'fs';
 import * as path from 'path';
+import type {FormattedTestResults} from '@jest/test-result';
 import runJest from '../runJest';
 
 describe('JSON Reporter', () => {
@@ -22,7 +23,7 @@ describe('JSON Reporter', () => {
   });
 
   it('writes test result to sum.result.json', () => {
-    let jsonResult;
+    let jsonResult: FormattedTestResults;
 
     runJest('json-reporter', ['--json', `--outputFile=${outputFileName}`]);
     const testOutput = fs.readFileSync(outputFilePath, 'utf8');
@@ -45,7 +46,7 @@ describe('JSON Reporter', () => {
     const noAncestors = jsonResult.testResults[0].assertionResults.find(
       item => item.title == 'no ancestors',
     );
-    let expected = {ancestorTitles: []};
+    let expected = {ancestorTitles: [] as Array<string>};
     expect(noAncestors).toEqual(expect.objectContaining(expected));
 
     const addsNumbers = jsonResult.testResults[0].assertionResults.find(
@@ -63,7 +64,7 @@ describe('JSON Reporter', () => {
 
   it('outputs coverage report', () => {
     const result = runJest('json-reporter', ['--json']);
-    let jsonResult;
+    let jsonResult: FormattedTestResults;
 
     expect(result.stderr).toMatch(/1 failed, 2 passed/);
     expect(result.exitCode).toBe(1);
@@ -86,7 +87,7 @@ describe('JSON Reporter', () => {
     const noAncestors = jsonResult.testResults[0].assertionResults.find(
       item => item.title == 'no ancestors',
     );
-    let expected = {ancestorTitles: []};
+    let expected = {ancestorTitles: [] as Array<string>};
     expect(noAncestors).toEqual(expect.objectContaining(expected));
 
     const addsNumbers = jsonResult.testResults[0].assertionResults.find(

e2e/__tests__/listTests.test.ts

@@ -11,7 +11,7 @@ import runJest from '../runJest';
 
 const testRootDir = path.resolve(__dirname, '..', '..');
 
-const normalizePaths = rawPaths =>
+const normalizePaths = (rawPaths: string) =>
   rawPaths
     .split(testRootDir)
     .join(`${path.sep}MOCK_ABOLUTE_PATH`)

e2e/__tests__/nodePath.test.ts

@@ -9,7 +9,7 @@ import runJest from '../runJest';
 
 test('supports NODE_PATH', () => {
   const result = runJest('node-path', [], {
-    nodePath: ['../node-path/src'],
+    nodePath: '../node-path/src',
   });
   expect(result.exitCode).toBe(0);
 });

e2e/__tests__/overrideGlobals.test.ts

@@ -18,7 +18,7 @@ test('has a duration even if time is faked', () => {
 
   expect(stderr).toMatch(regex);
 
-  const [, duration] = stderr.match(regex);
+  const [, duration] = stderr.match(regex)!;
 
   expect(Number(duration)).toBeGreaterThan(0);
 });

e2e/__tests__/showConfig.test.ts

@@ -37,8 +37,8 @@ test('--showConfig outputs config info and exits', () => {
     .replace(/"name": "(.+)"/g, '"name": "[md5 hash]"')
     .replace(/"version": "(.+)"/g, '"version": "[version]"')
     .replace(/"maxWorkers": (\d+)/g, '"maxWorkers": "[maxWorkers]"')
-    .replace(/\"\S*show-config-test/gm, '"<<REPLACED_ROOT_DIR>>')
-    .replace(/\"\S*\/jest\/packages/gm, '"<<REPLACED_JEST_PACKAGES_DIR>>');
+    .replace(/"\S*show-config-test/gm, '"<<REPLACED_ROOT_DIR>>')
+    .replace(/"\S*\/jest\/packages/gm, '"<<REPLACED_JEST_PACKAGES_DIR>>');
 
   expect(wrap(stdout)).toMatchSnapshot();
 });

e2e/__tests__/testEnvironment.test.ts

@@ -7,7 +7,7 @@
 
 import {json as runWithJson} from '../runJest';
 
-import testFixturePackage from '../test-environment/package.json';
+import * as testFixturePackage from '../test-environment/package.json';
 
 it('respects testEnvironment docblock', () => {
   expect(testFixturePackage.jest.testEnvironment).toEqual('node');

e2e/__tests__/toMatchSnapshotWithStringSerializer.test.ts

@@ -16,7 +16,7 @@ const DIR = path.resolve(
 );
 const TESTS_DIR = path.resolve(DIR, '__tests__');
 
-const readFile = filename =>
+const readFile = (filename: string) =>
   fs.readFileSync(path.join(TESTS_DIR, filename), 'utf8');
 
 beforeEach(() => cleanup(TESTS_DIR));

e2e/__tests__/toThrowErrorMatchingInlineSnapshot.test.ts

@@ -17,7 +17,7 @@ const DIR = path.resolve(
 );
 const TESTS_DIR = path.resolve(DIR, '__tests__');
 
-const readFile = filename =>
+const readFile = (filename: string) =>
   fs.readFileSync(path.join(TESTS_DIR, filename), 'utf8');
 
 beforeEach(() => cleanup(TESTS_DIR));

e2e/__tests__/watchModeOnlyFailed.test.ts

@@ -22,7 +22,7 @@ expect.addSnapshotSerializer({
   test: val => typeof val === 'string' && val.includes('[s'),
 });
 
-const setupFiles = input => {
+const setupFiles = (input: Array<{keys: Array<string>}>) => {
   writeFiles(DIR, {
     '__tests__/bar.spec.js': `
       test('bar 1', () => { expect('bar').toBe('foo'); });

e2e/__tests__/watchModePatterns.test.ts

@@ -22,7 +22,7 @@ expect.addSnapshotSerializer({
   test: val => typeof val === 'string' && val.includes('[s'),
 });
 
-const setupFiles = input => {
+const setupFiles = (input: Array<{keys: Array<string>}>) => {
   writeFiles(DIR, {
     '__tests__/bar.spec.js': `
       test('bar 1', () => { expect('bar').toBe('bar'); });

e2e/__tests__/watchModeUpdateSnapshot.test.ts

@@ -22,7 +22,7 @@ expect.addSnapshotSerializer({
   test: val => typeof val === 'string' && val.includes('[s'),
 });
 
-const setupFiles = input => {
+const setupFiles = (input: Array<{keys: Array<string>}>) => {
   writeFiles(DIR, {
     '__tests__/__snapshots__/bar.spec.js.snap': `// Jest Snapshot v1, https://goo.gl/fbAQLP
 

e2e/__tests__/workerForceExit.test.ts

@@ -7,7 +7,7 @@
 
 import {tmpdir} from 'os';
 import {resolve} from 'path';
-import findProcess from 'find-process';
+import findProcess = require('find-process');
 
 import {
   cleanup,
@@ -27,7 +27,7 @@ const testFiles = {
   }`,
 };
 
-const verifyNumPassed = stderr => {
+const verifyNumPassed = (stderr: string) => {
   const numberOfTestsPassed = (stderr.match(/\bPASS\b/g) || []).length;
   // assuming -1 because of package.json, but +1 because of the individual test file
   expect(numberOfTestsPassed).toBe(Object.keys(testFiles).length);
@@ -64,6 +64,11 @@ test('force exits a worker that fails to exit gracefully', async () => {
   expect(exitCode).toBe(0);
   verifyNumPassed(stderr);
 
-  const [pid] = /pid: \d+/.exec(stderr);
+  const execRes = /pid: \d+/.exec(stderr);
+
+  expect(execRes).toHaveLength(1);
+
+  const [pid] = execRes!;
+
   expect(await findProcess('pid', pid)).toHaveLength(0);
 });

e2e/babel-plugin-jest-hoist/__tests__/typescript.test.ts

@@ -6,7 +6,7 @@
  *
  */
 
-import {Color} from '../types';
+import type {Color} from '../types';
 import {color} from '../entry';
 
 jest.mock('some-module', () => ({} as Partial<{}>), {virtual: true});

e2e/runJest.ts

@@ -31,7 +31,7 @@ export default function runJest(
   dir: string,
   args?: Array<string>,
   options: RunJestOptions = {},
-) {
+): RunJestResult {
   return normalizeStdoutAndStderr(spawnJest(dir, args, options), options);
 }
 
@@ -40,7 +40,7 @@ function spawnJest(
   args?: Array<string>,
   options?: RunJestOptions,
   spawnAsync?: false,
-): execa.ExecaReturnValue;
+): RunJestResult;
 function spawnJest(
   dir: string,
   args?: Array<string>,
@@ -51,7 +51,7 @@ function spawnJest(
 // Spawns Jest and returns either a Promise (if spawnAsync is true) or the completed child process
 function spawnJest(
   dir: string,
-  args?: Array<string>,
+  args: Array<string> = [],
   options: RunJestOptions = {},
   spawnAsync: boolean = false,
 ): execa.ExecaSyncReturnValue | execa.ExecaChildProcess {
@@ -77,7 +77,7 @@ function spawnJest(
   if (options.nodeOptions) env['NODE_OPTIONS'] = options.nodeOptions;
   if (options.nodePath) env['NODE_PATH'] = options.nodePath;
 
-  const spawnArgs = [JEST_PATH, ...(args || [])];
+  const spawnArgs = [JEST_PATH, ...args];
   const spawnOptions = {
     cwd: dir,
     env,
@@ -92,14 +92,16 @@ function spawnJest(
   );
 }
 
-interface RunJestJsonResult extends execa.ExecaReturnValue {
+export type RunJestResult = execa.ExecaReturnValue;
+
+interface RunJestJsonResult extends RunJestResult {
   json: FormattedTestResults;
 }
 
 function normalizeStdoutAndStderr(
-  result: execa.ExecaReturnValue,
+  result: RunJestResult,
   options: RunJestOptions,
-) {
+): RunJestResult {
   result.stdout = normalizeIcons(result.stdout);
   if (options.stripAnsi) result.stdout = stripAnsi(result.stdout);
   result.stderr = normalizeIcons(result.stderr);
@@ -114,7 +116,7 @@ function normalizeStdoutAndStderr(
 //   'numPendingTests', 'testResults'
 export const json = function (
   dir: string,
-  args: Array<string> | undefined,
+  args?: Array<string>,
   options: RunJestOptions = {},
 ): RunJestJsonResult {
   args = [...(args || []), '--json'];

e2e/tsconfig.json

@@ -0,0 +1,22 @@
+{
+  "compilerOptions": {
+    "noEmit": true,
+
+    "target": "es2017",
+    "module": "commonjs",
+    "lib": ["dom", "es2017"],
+    "strict": true,
+
+    /* Additional Checks */
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noImplicitReturns": true,
+    "noFallthroughCasesInSwitch": true,
+
+    /* Module Resolution Options */
+    "moduleResolution": "node",
+    "isolatedModules": true,
+    "importsNotUsedAsValues": "error",
+    "resolveJsonModule": true
+  }
+}