chore: default to node test env rather than browser

Author: SimenB

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Features
 
+- `[jest-config]` [**BREAKING**] Default to Node testing environment instead of browser (JSDOM) ([#9874](https://github.com/facebook/jest/pull/9874))
+
 ### Fixes
 
 ### Chore & Maintenance

docs/Configuration.md

@@ -989,9 +989,9 @@ More about serializers API can be found [here](https://github.com/facebook/jest/
 
 ### `testEnvironment` [string]
 
-Default: `"jsdom"`
+Default: `"node"`
 
-The test environment that will be used for testing. The default environment in Jest is a browser-like environment through [jsdom](https://github.com/jsdom/jsdom). If you are building a node service, you can use the `node` option to use a node-like environment instead.
+The test environment that will be used for testing. The default environment in Jest is a Node.js environment. If you are building a web app, you can use a browser-like environment through [`jsdom`](https://github.com/jsdom/jsdom) instead.
 
 By adding a `@jest-environment` docblock at the top of the file, you can specify another environment to be used for all tests in that file:
 
@@ -1071,7 +1071,7 @@ beforeAll(() => {
 
 Default: `{}`
 
-Test environment options that will be passed to the `testEnvironment`. The relevant options depend on the environment. For example you can override options given to [jsdom](https://github.com/jsdom/jsdom) such as `{userAgent: "Agent/007"}`.
+Test environment options that will be passed to the `testEnvironment`. The relevant options depend on the environment. For example, you can override options given to [jsdom](https://github.com/jsdom/jsdom) such as `{userAgent: "Agent/007"}`.
 
 ### `testFailureExitCode` [number]
 

e2e/__tests__/__snapshots__/showConfig.test.ts.snap

@@ -51,7 +51,7 @@ exports[`--showConfig outputs config info and exits 1`] = `
       "skipFilter": false,
       "slowTestThreshold": 5,
       "snapshotSerializers": [],
-      "testEnvironment": "<<REPLACED_JEST_PACKAGES_DIR>>/jest-environment-jsdom/build/index.js",
+      "testEnvironment": "<<REPLACED_JEST_PACKAGES_DIR>>/jest-environment-node/build/index.js",
       "testEnvironmentOptions": {},
       "testLocationInResults": false,
       "testMatch": [

e2e/__tests__/config.test.ts

@@ -59,6 +59,7 @@ test('works with jsdom testEnvironmentOptions config JSON', () => {
   const result = runJest('environmentOptions', [
     '--config=' +
       JSON.stringify({
+        testEnvironment: 'jsdom',
         testEnvironmentOptions: {
           url: 'https://jestjs.io',
         },

e2e/dom-diffing/package.json

@@ -1,3 +1,5 @@
 {
-  "jest": {}
+  "jest": {
+    "testEnvironment": "jsdom"
+  }
 }

examples/angular/jest.config.js

@@ -1,6 +1,7 @@
 module.exports = {
   moduleFileExtensions: ['ts', 'html', 'js', 'json'],
   setupFilesAfterEnv: ['<rootDir>/setupJest.js'],
+  testEnvironment: 'jsdom',
   transform: {
     '\\.[tj]s$': ['babel-jest', {configFile: require.resolve('./.babelrc')}],
   },

examples/jquery/package.json

@@ -13,5 +13,8 @@
   },
   "scripts": {
     "test": "jest"
+  },
+  "jest": {
+    "testEnvironment": "jsdom"
   }
 }

examples/react-testing-library/package.json

@@ -17,5 +17,8 @@
   },
   "scripts": {
     "test": "jest"
+  },
+  "jest": {
+    "testEnvironment": "jsdom"
   }
 }

examples/react/package.json

@@ -16,5 +16,8 @@
   },
   "scripts": {
     "test": "jest"
+  },
+  "jest": {
+    "testEnvironment": "jsdom"
   }
 }

examples/typescript/package.json

@@ -18,5 +18,8 @@
   },
   "scripts": {
     "test": "jest"
+  },
+  "jest": {
+    "testEnvironment": "jsdom"
   }
 }