From d2b0b6131f2ed87f2b81ae227110691965705221 Mon Sep 17 00:00:00 2001
From: TrickyPi <530257315@qq.com>
Date: Wed, 2 Mar 2022 11:31:02 +0800
Subject: [PATCH] feat(jest-runtime): calling jest.resetModules function will
 clear require cache

---
 CHANGELOG.md                            |  2 +-
 e2e/__tests__/clearRequireCache.test.ts |  6 ++++++
 e2e/clear-require-cache/package.json    |  5 +++++
 e2e/clear-require-cache/test.js         | 25 +++++++++++++++++++++++++
 e2e/clear-require-cache/testHelper.js   |  1 +
 packages/jest-runtime/src/index.ts      |  2 ++
 6 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 e2e/__tests__/clearRequireCache.test.ts
 create mode 100644 e2e/clear-require-cache/package.json
 create mode 100644 e2e/clear-require-cache/test.js
 create mode 100644 e2e/clear-require-cache/testHelper.js

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2eea5ff29d01..79c748e6b2dd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ## main
 
 ### Features
-
+- `[jest-runtime]` Calling jest.resetModules function will clear require cache ([#12531](https://github.com/facebook/jest/pull/12531))
 - `[babel-jest]` Export `createTransformer` function ([#12399](https://github.com/facebook/jest/pull/12399))
 - `[expect]` Expose `AsymmetricMatchers`, `MatcherFunction` and `MatcherFunctionWithState` interfaces ([#12363](https://github.com/facebook/jest/pull/12363), [#12376](https://github.com/facebook/jest/pull/12376))
 - `[jest-circus, jest-jasmine2]` Allowed classes and functions as `describe` and `it`/`test` names ([#12484](https://github.com/facebook/jest/pull/12484))
diff --git a/e2e/__tests__/clearRequireCache.test.ts b/e2e/__tests__/clearRequireCache.test.ts
new file mode 100644
index 000000000000..9f0b0d11ca8e
--- /dev/null
+++ b/e2e/__tests__/clearRequireCache.test.ts
@@ -0,0 +1,6 @@
+import runJest from '../runJest';
+
+test('clear require cache', () => {
+  const {exitCode} = runJest('clear-require-cache');
+  expect(exitCode).toBe(0);
+});
diff --git a/e2e/clear-require-cache/package.json b/e2e/clear-require-cache/package.json
new file mode 100644
index 000000000000..148788b25446
--- /dev/null
+++ b/e2e/clear-require-cache/package.json
@@ -0,0 +1,5 @@
+{
+  "jest": {
+    "testEnvironment": "node"
+  }
+}
diff --git a/e2e/clear-require-cache/test.js b/e2e/clear-require-cache/test.js
new file mode 100644
index 000000000000..0c1246f0fff5
--- /dev/null
+++ b/e2e/clear-require-cache/test.js
@@ -0,0 +1,25 @@
+const fs = require('fs');
+const path = require('path');
+
+const asboulteTestHelperFile = path.resolve(__dirname, './testHelper.js');
+
+beforeAll(() => {
+  fs.writeFileSync(asboulteTestHelperFile, 'module.exports = 1;\n');
+});
+
+test('value is 1', () => {
+  const value = require('./testHelper');
+  expect(value).toBe(1);
+});
+
+test('value is 1 after file change', () => {
+  fs.writeFileSync(asboulteTestHelperFile, 'module.exports = 2;\n');
+  const value = require('./testHelper');
+  expect(value).toBe(1);
+});
+
+test('value is 2', () => {
+  jest.resetModules();
+  const value = require('./testHelper');
+  expect(value).toBe(2);
+});
diff --git a/e2e/clear-require-cache/testHelper.js b/e2e/clear-require-cache/testHelper.js
new file mode 100644
index 000000000000..4bbffde10442
--- /dev/null
+++ b/e2e/clear-require-cache/testHelper.js
@@ -0,0 +1 @@
+module.exports = 2;
diff --git a/packages/jest-runtime/src/index.ts b/packages/jest-runtime/src/index.ts
index f3800ee66167..7fc8a91f6af3 100644
--- a/packages/jest-runtime/src/index.ts
+++ b/packages/jest-runtime/src/index.ts
@@ -1141,6 +1141,8 @@ export default class Runtime {
     this._esmoduleRegistry.clear();
     this._cjsNamedExports.clear();
     this._moduleMockRegistry.clear();
+    this._cacheFS.clear();
+    this._fileTransforms.clear();
 
     if (this._environment) {
       if (this._environment.global) {