chore(jest-haste-map): Remove legacy isRegExpSupported (#12676)

Author: robhogan

CHANGELOG.md

@@ -105,6 +105,7 @@
 - `[@jest/core]` Use `index.ts` instead of `jest.ts` as main export ([#12329](https://github.com/facebook/jest/pull/12329))
 - `[jest-environment-jsdom]` [**BREAKING**] Migrate to ESM ([#12340](https://github.com/facebook/jest/pull/12340))
 - `[jest-environment-node]` [**BREAKING**] Migrate to ESM ([#12340](https://github.com/facebook/jest/pull/12340))
+- `[jest-haste-map]` Remove legacy `isRegExpSupported` ([#12676](https://github.com/facebook/jest/pull/12676))
 - `[@jest/fake-timers]` Update `@sinonjs/fake_timers` to v9 ([#12357](https://github.com/facebook/jest/pull/12357))
 - `[jest-jasmine2, jest-runtime]` [**BREAKING**] Use `Symbol` to pass `jest.setTimeout` value instead of `jasmine` specific logic ([#12124](https://github.com/facebook/jest/pull/12124))
 - `[jest-phabricator]` [**BREAKING**] Migrate to ESM ([#12341](https://github.com/facebook/jest/pull/12341))

packages/jest-haste-map/src/lib/__tests__/dependencyExtractor.test.js

@@ -6,9 +6,6 @@
  */
 
 import {extractor} from '../dependencyExtractor';
-import isRegExpSupported from '../isRegExpSupported';
-
-const COMMENT_NO_NEG_LB = isRegExpSupported('(?<!\\.\\s*)') ? '' : '//';
 
 describe('dependencyExtractor', () => {
   it('should not extract dependencies inside comments', () => {
@@ -65,8 +62,8 @@ describe('dependencyExtractor', () => {
       }, depDefault from 'dep4';
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . import ('inv1');
-      ${COMMENT_NO_NEG_LB} foo . export ('inv2');
+      foo . import ('inv1');
+      foo . export ('inv2');
     `;
     expect(extractor.extract(code)).toEqual(
       new Set(['dep1', 'dep2', 'dep3', 'dep4']),
@@ -114,8 +111,8 @@ describe('dependencyExtractor', () => {
       }, depDefault from 'dep4';
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . export ('inv1');
-      ${COMMENT_NO_NEG_LB} foo . export ('inv2');
+      foo . export ('inv1');
+      foo . export ('inv2');
     `;
     expect(extractor.extract(code)).toEqual(
       new Set(['dep1', 'dep2', 'dep3', 'dep4']),
@@ -137,8 +134,8 @@ describe('dependencyExtractor', () => {
       }, depDefault from 'dep4';
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . export ('inv1');
-      ${COMMENT_NO_NEG_LB} foo . export ('inv2');
+      foo . export ('inv1');
+      foo . export ('inv2');
     `;
     expect(extractor.extract(code)).toEqual(
       new Set(['dep1', 'dep2', 'dep3', 'dep4']),
@@ -164,7 +161,7 @@ describe('dependencyExtractor', () => {
       if (await import(\`dep3\`)) {}
 
       // Bad
-      ${COMMENT_NO_NEG_LB} await foo . import('inv1')
+      await foo . import('inv1')
       await ximport('inv2');
       importx('inv3');
       import('inv4', 'inv5');
@@ -182,7 +179,7 @@ describe('dependencyExtractor', () => {
       if (require(\`dep3\`).cond) {}
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . require('inv1')
+      foo . require('inv1')
       xrequire('inv2');
       requirex('inv3');
       require('inv4', 'inv5');
@@ -202,7 +199,7 @@ describe('dependencyExtractor', () => {
         .requireActual('dep4');
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . jest.requireActual('inv1')
+      foo . jest.requireActual('inv1')
       xjest.requireActual('inv2');
       jest.requireActualx('inv3');
       jest.requireActual('inv4', 'inv5');
@@ -224,7 +221,7 @@ describe('dependencyExtractor', () => {
         .requireMock('dep4');
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . jest.requireMock('inv1')
+      foo . jest.requireMock('inv1')
       xjest.requireMock('inv2');
       jest.requireMockx('inv3');
       jest.requireMock('inv4', 'inv5');
@@ -246,7 +243,7 @@ describe('dependencyExtractor', () => {
         .requireMock('dep4');
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . jest.genMockFromModule('inv1')
+      foo . jest.genMockFromModule('inv1')
       xjest.genMockFromModule('inv2');
       jest.genMockFromModulex('inv3');
       jest.genMockFromModule('inv4', 'inv5');
@@ -268,7 +265,7 @@ describe('dependencyExtractor', () => {
         .requireMock('dep4');
 
       // Bad
-      ${COMMENT_NO_NEG_LB} foo . jest.createMockFromModule('inv1')
+     foo . jest.createMockFromModule('inv1')
       xjest.createMockFromModule('inv2');
       jest.createMockFromModulex('inv3');
       jest.createMockFromModule('inv4', 'inv5');

packages/jest-haste-map/src/lib/__tests__/isRegExpSupported.test.js

@@ -6,12 +6,8 @@
  */
 
 import type {DependencyExtractor} from '../types';
-import isRegExpSupported from './isRegExpSupported';
 
-// Negative look behind is only supported in Node 9+
-const NOT_A_DOT = isRegExpSupported('(?<!\\.\\s*)')
-  ? '(?<!\\.\\s*)'
-  : '(?:^|[^.]\\s*)';
+const NOT_A_DOT = '(?<!\\.\\s*)';
 const CAPTURE_STRING_LITERAL = (pos: number) =>
   `([\`'"])([^'"\`]*?)(?:\\${pos})`;
 const WORD_SEPARATOR = '\\b';