feat: unforce module CommonJS when testing with ESM (#2199)

When `extensionsToTreatAsEsm` option is not an empty array, `CommonJS` enforcement will be no longer applicable

BREAKING CHANGE
To run tests with ESM support, one needs to make sure that:
 - `module` in tsconfig should be either `es2015` or `es2020` or `esnext`
 - Use `ts-jest` ESM presets or define value for `extensionsToTreatAsEsm` option properly

e2e/__helpers__/test-case/runtime.ts

@@ -27,7 +27,7 @@ import * as Paths from '../../../scripts/lib/paths'
 
 import RunResult from './run-result'
 import type { PreparedTest, RunTestOptions } from './types'
-import { enableOptimizations, templateNameForPath } from './utils'
+import { enableOptimizations, nodeWithESMSupport, templateNameForPath } from './utils'
 
 const TEMPLATE_EXCLUDED_ITEMS = ['node_modules', 'package-lock.json']
 
@@ -55,7 +55,7 @@ function hooksSourceWith(vars: Record<string, any>): string {
 }
 
 export function run(name: string, options: RunTestOptions = {}): RunResult {
-  const { env = {}, template, inject, writeIo, noCache, jestConfigPath: configFile = 'jest.config.js' } = options
+  const { env = {}, template, inject, writeIo, noCache, jestConfigPath: configFile = 'jest.config.js', jestConfig } = options
   const { workdir: dir, sourceDir } = prepareTest(
     name,
     template || templateNameForPath(join(Paths.e2eSourceDir, name)),
@@ -89,8 +89,8 @@ export function run(name: string, options: RunTestOptions = {}): RunResult {
   }
 
   // extends config
-  if (options.jestConfig) {
-    merge(extraConfig, options.jestConfig)
+  if (jestConfig) {
+    merge(extraConfig, jestConfig)
   }
   if (options.tsJestConfig) {
     const globalConfig: any = extraConfig.globals || (extraConfig.globals = {'ts-jest': {}})
@@ -108,6 +108,11 @@ export function run(name: string, options: RunTestOptions = {}): RunResult {
     extraConfig.cacheDirectory = join(Paths.cacheDir, `e2e-${template}`)
   }
 
+  // Run with ESM support
+  if (nodeWithESMSupport && jestConfig?.extensionsToTreatAsEsm?.length) {
+    shortCmd = 'node --experimental-vm-modules node_modules/.bin/jest'
+  }
+
   // build final config and create dir suffix based on it
   const finalConfig = merge({}, baseConfig, extraConfig)
   const digest = createHash('sha1')

e2e/__helpers__/test-case/types.ts

@@ -9,7 +9,7 @@ export interface RunTestOptions {
   env?: Record<string, unknown>
   inject?: (() => any) | string
   writeIo?: boolean
-  jestConfig?: Config.ProjectConfig | Record<string, unknown>
+  jestConfig?: Config.InitialOptions
   tsJestConfig?: TsJestGlobalOptions
   noCache?: boolean
   jestConfigPath?: string

e2e/__helpers__/test-case/utils.ts

@@ -55,3 +55,5 @@ export function escapeRegex(s: string): string {
 export function enableOptimizations(): boolean {
   return !!process.env.TS_JEST_E2E_OPTIMIZATIONS
 }
+
+export const nodeWithESMSupport = process.version.startsWith('v12') || process.version.startsWith('v14')

e2e/__tests__/allow-js.test.ts

@@ -3,7 +3,7 @@ import { configureTestCase } from '../__helpers__/test-case'
 
 describe('using babel-jest for js files', () => {
   const testCase = configureTestCase('allow-js/with-outDir', {
-    jestConfig: { testMatch: null, testRegex: '(foo|bar)\\.spec\\.[jt]s$' },
+    jestConfig: { testRegex: '(foo|bar)\\.spec\\.[jt]s$' },
   })
 
   testCase.runWithTemplates(allValidPackageSets, 0, (runTest, { testLabel }) => {
@@ -19,7 +19,6 @@ describe('using ts-jest for js files with outDir', () => {
   const testCase = configureTestCase('allow-js/with-outDir', {
     jestConfig: {
       preset: 'ts-jest/presets/js-with-ts',
-      testMatch: null,
       testRegex: 'esm\\.spec\\.[jt]s$',
     },
   })
@@ -37,7 +36,6 @@ describe('using ts-jest for js files without outDir', () => {
   const testCase = configureTestCase('allow-js/without-outDir', {
     jestConfig: {
       preset: 'ts-jest/presets/js-with-ts',
-      testMatch: null,
       testRegex: 'esm\\.spec\\.[jt]s$',
     },
   })

e2e/__tests__/module-kinds/__snapshots__/amd.test.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`run with options: {"module":"amd","allowSyntheticDefaultImports":false} 1`] = `
+exports[`Module amd run with options: {"module":"amd","allowSyntheticDefaultImports":false} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -44,7 +44,7 @@ exports[`run with options: {"module":"amd","allowSyntheticDefaultImports":false}
   ================================================================================
 `;
 
-exports[`run with options: {"module":"amd","allowSyntheticDefaultImports":true} 1`] = `
+exports[`Module amd run with options: {"module":"amd","allowSyntheticDefaultImports":true} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -78,7 +78,7 @@ exports[`run with options: {"module":"amd","allowSyntheticDefaultImports":true}
   ================================================================================
 `;
 
-exports[`run with options: {"module":"amd","esModuleInterop":false} 1`] = `
+exports[`Module amd run with options: {"module":"amd","esModuleInterop":false} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -113,7 +113,7 @@ exports[`run with options: {"module":"amd","esModuleInterop":false} 1`] = `
   ================================================================================
 `;
 
-exports[`run with options: {"module":"amd","esModuleInterop":true} 1`] = `
+exports[`Module amd run with options: {"module":"amd","esModuleInterop":true} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -158,7 +158,7 @@ exports[`run with options: {"module":"amd","esModuleInterop":true} 1`] = `
   ================================================================================
 `;
 
-exports[`run with options: {"module":"amd"} 1`] = `
+exports[`Module amd run with options: {"module":"amd"} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================

e2e/__tests__/module-kinds/__snapshots__/commonjs.test.ts.snap

@@ -1,6 +1,6 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
-exports[`run with options: {"module":"commonjs","allowSyntheticDefaultImports":false} 1`] = `
+exports[`Module commonjs run with options: {"module":"commonjs","allowSyntheticDefaultImports":false} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -43,7 +43,7 @@ exports[`run with options: {"module":"commonjs","allowSyntheticDefaultImports":f
   ================================================================================
 `;
 
-exports[`run with options: {"module":"commonjs","allowSyntheticDefaultImports":true} 1`] = `
+exports[`Module commonjs run with options: {"module":"commonjs","allowSyntheticDefaultImports":true} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -77,7 +77,7 @@ exports[`run with options: {"module":"commonjs","allowSyntheticDefaultImports":t
   ================================================================================
 `;
 
-exports[`run with options: {"module":"commonjs","esModuleInterop":false} 1`] = `
+exports[`Module commonjs run with options: {"module":"commonjs","esModuleInterop":false} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -120,7 +120,7 @@ exports[`run with options: {"module":"commonjs","esModuleInterop":false} 1`] = `
   ================================================================================
 `;
 
-exports[`run with options: {"module":"commonjs","esModuleInterop":true} 1`] = `
+exports[`Module commonjs run with options: {"module":"commonjs","esModuleInterop":true} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================
@@ -165,7 +165,7 @@ exports[`run with options: {"module":"commonjs","esModuleInterop":true} 1`] = `
   ================================================================================
 `;
 
-exports[`run with options: {"module":"commonjs"} 1`] = `
+exports[`Module commonjs run with options: {"module":"commonjs"} with template default 1`] = `
   × jest --no-cache
   ↳ exit code: 1
   ===[ STDOUT ]===================================================================