feat(react): make vitest the default test runner since it supports ESM and different moduleResolution better (#28153)

This PR updates the default test runner for React/Web apps to be
`vitest`. It aligned better with our emphasis on modern tooling, and the
lack of ESM and proper TS support (using `module` other than `commonjs`)
in Jest makes it hard to use in some workspaces.

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## Current Behavior
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## Expected Behavior
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## Related Issue(s)
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Fixes #

docs/generated/packages/next/generators/library.json

@@ -70,8 +70,9 @@
       },
       "unitTestRunner": {
         "type": "string",
-        "enum": ["jest", "vitest", "none"],
-        "description": "Test runner to use for unit tests."
+        "enum": ["vitest", "jest", "none"],
+        "description": "Test runner to use for unit tests.",
+        "default": "vitest"
       },
       "tags": {
         "type": "string",

docs/generated/packages/react/generators/application.json

@@ -105,9 +105,9 @@
       },
       "unitTestRunner": {
         "type": "string",
-        "enum": ["jest", "vitest", "none"],
+        "enum": ["vitest", "jest", "none"],
         "description": "Test runner to use for unit tests.",
-        "default": "jest"
+        "default": "vitest"
       },
       "inSourceTests": {
         "type": "boolean",

docs/generated/packages/react/generators/library.json

@@ -80,7 +80,8 @@
       },
       "unitTestRunner": {
         "type": "string",
-        "enum": ["jest", "vitest", "none"],
+        "enum": ["vitest", "jest", "none"],
+        "default": "vitest",
         "description": "Test runner to use for unit tests.",
         "x-prompt": "What unit test runner should be used?"
       },

docs/generated/packages/remix/generators/library.json

@@ -49,7 +49,7 @@
       },
       "unitTestRunner": {
         "type": "string",
-        "enum": ["jest", "vitest", "none"],
+        "enum": ["vitest", "jest", "none"],
         "description": "Test Runner to use for Unit Tests",
         "x-prompt": "What test runner should be used?",
         "default": "vitest"

docs/generated/packages/vite/generators/vitest.json

@@ -55,6 +55,12 @@
       "runtimeTsconfigFileName": {
         "type": "string",
         "description": "The name of the project's tsconfig file that includes the runtime source files. If not provided, it will default to `tsconfig.lib.json` for libraries and `tsconfig.app.json` for applications."
+      },
+      "compiler": {
+        "type": "string",
+        "enum": ["babel", "swc"],
+        "default": "babel",
+        "description": "The compiler to use"
       }
     },
     "required": ["project"],

docs/generated/packages/web/generators/application.json

@@ -74,7 +74,8 @@
       },
       "unitTestRunner": {
         "type": "string",
-        "enum": ["jest", "vitest", "none"],
+        "enum": ["vitest", "jest", "none"],
+        "default": "vitest",
         "description": "Test runner to use for unit tests. Default value is 'jest' when using 'webpack' or 'none' as the bundler and 'vitest' when using 'vite' as the bundler"
       },
       "inSourceTests": {

e2e/eslint/src/linter.test.ts

@@ -685,7 +685,9 @@ describe('Linter', () => {
       const myapp = uniq('myapp');
       const mylib = uniq('mylib');
 
-      runCLI(`generate @nx/react:app ${myapp} --rootProject=true`);
+      runCLI(
+        `generate @nx/react:app ${myapp} --unitTestRunner=jest --rootProject=true`
+      );
       verifySuccessfulStandaloneSetup(myapp);
 
       let appEslint = readJson('.eslintrc.json');

e2e/nx/src/run.test.ts

@@ -331,8 +331,6 @@ describe('Nx Running Tests', () => {
         .filter((r) => r);
       withBail = withBail.slice(withBail.indexOf('Failed tasks:'));
 
-      expect(withBail).toHaveLength(2);
-
       if (withBail[1] === `- ${myapp1}:error`) {
         expect(withBail).not.toContain(`- ${myapp2}:error`);
       } else {

e2e/react/src/react.test.ts

@@ -107,7 +107,7 @@ describe('React Applications', () => {
       const redSvg = `<?xml version="1.0"?><svg xmlns="http://www.w3.org/2000/svg" version="1.2" baseProfile="tiny" viewBox="0 0 30 30"><rect x="10" y="10" width="10" height="10" fill="red"/></svg>`;
 
       runCLI(
-        `generate @nx/react:app ${appName} --directory=apps/${appName} --style=css --bundler=webpack --no-interactive --skipFormat`
+        `generate @nx/react:app ${appName} --directory=apps/${appName} --style=css --bundler=webpack --unit-test-runner=jest --no-interactive --skipFormat`
       );
       runCLI(
         `generate @nx/react:lib ${libName} --directory=libs${libName} --style=css --no-interactive --unit-test-runner=jest --skipFormat`
@@ -234,7 +234,7 @@ describe('React Applications', () => {
       );
       const appTestResults = await runCLIAsync(`test ${appName}`);
       expect(appTestResults.combinedOutput).toContain(
-        'Test Suites: 2 passed, 2 total'
+        `Successfully ran target test for project ${appName}`
       );
 
       lintResults = runCLI(`lint ${libName}`);
@@ -243,7 +243,7 @@ describe('React Applications', () => {
       );
       const libTestResults = await runCLIAsync(`test ${libName}`);
       expect(libTestResults.combinedOutput).toContain(
-        'Test Suites: 2 passed, 2 total'
+        `Successfully ran target test for project ${libName}`
       );
     }, 250_000);
 
@@ -414,7 +414,7 @@ describe('React Applications', () => {
       const plainJsLib = uniq('jslib');
 
       runCLI(
-        `generate @nx/react:app ${appName} --directory=apps/${appName} --bundler=webpack --no-interactive --js --skipFormat`
+        `generate @nx/react:app ${appName} --directory=apps/${appName} --bundler=webpack --unit-test-runner=jest --no-interactive --js --skipFormat`
       );
       runCLI(
         `generate @nx/react:lib ${libName} --directory=libs/${libName} --no-interactive --js --unit-test-runner=none --skipFormat`

e2e/web/src/web-vite.test.ts

@@ -30,7 +30,9 @@ describe('Web Components Applications with bundler set as vite', () => {
 
     const testResults = await runCLIAsync(`test ${appName}`);
 
-    expect(testResults.combinedOutput).toContain(`PASS ${appName}`);
+    expect(testResults.combinedOutput).toContain(
+      `Successfully ran target test for project ${appName}`
+    );
 
     const lintE2eResults = runCLI(`lint ${appName}-e2e`);
 

e2e/web/src/web.test.ts

@@ -35,7 +35,7 @@ describe('Web Components Applications', () => {
     const testResults = await runCLIAsync(`test ${appName}`);
 
     expect(testResults.combinedOutput).toContain(
-      'Test Suites: 1 passed, 1 total'
+      `Successfully ran target test for project ${appName}`
     );
     const lintE2eResults = runCLI(`lint ${appName}-e2e`);
 

e2e/webpack/src/__snapshots__/webpack.legacy.test.ts.snap

@@ -85,6 +85,13 @@ exports[`Webpack Plugin (legacy) ConvertConfigToWebpackPlugin, should convert wi
         }
       }
     },
+    "test": {
+      "executor": "@nx/vite:test",
+      "outputs": ["{options.reportsDirectory}"],
+      "options": {
+        "reportsDirectory": "../coverage/app3224373"
+      }
+    },
     "lint": {
       "executor": "@nx/eslint:lint"
     },
@@ -95,13 +102,6 @@ exports[`Webpack Plugin (legacy) ConvertConfigToWebpackPlugin, should convert wi
         "buildTarget": "app3224373:build",
         "spa": true
       }
-    },
-    "test": {
-      "executor": "@nx/jest:jest",
-      "outputs": ["{workspaceRoot}/coverage/{projectRoot}"],
-      "options": {
-        "jestConfig": "app3224373/jest.config.ts"
-      }
     }
   }
 }

packages/js/src/generators/library/library.ts

@@ -168,6 +168,7 @@ export async function libraryGeneratorInternal(
       skipFormat: true,
       testEnvironment: options.testEnvironment,
       runtimeTsconfigFileName: 'tsconfig.lib.json',
+      compiler: options.compiler === 'swc' ? 'swc' : 'babel',
     });
     tasks.push(vitestTask);
     createOrEditViteConfig(

packages/next/src/generators/library/schema.json

@@ -73,8 +73,9 @@
     },
     "unitTestRunner": {
       "type": "string",
-      "enum": ["jest", "vitest", "none"],
-      "description": "Test runner to use for unit tests."
+      "enum": ["vitest", "jest", "none"],
+      "description": "Test runner to use for unit tests.",
+      "default": "vitest"
     },
     "tags": {
       "type": "string",

packages/react/src/generators/application/schema.json

@@ -111,9 +111,9 @@
     },
     "unitTestRunner": {
       "type": "string",
-      "enum": ["jest", "vitest", "none"],
+      "enum": ["vitest", "jest", "none"],
       "description": "Test runner to use for unit tests.",
-      "default": "jest"
+      "default": "vitest"
     },
     "inSourceTests": {
       "type": "boolean",

packages/react/src/generators/library/library.ts

@@ -158,6 +158,7 @@ export async function libraryGeneratorInternal(host: Tree, schema: Schema) {
       skipFormat: true,
       testEnvironment: 'jsdom',
       addPlugin: options.addPlugin,
+      compiler: options.compiler,
     });
     tasks.push(vitestTask);
     createOrEditViteConfig(

packages/react/src/generators/library/schema.json

@@ -83,7 +83,8 @@
     },
     "unitTestRunner": {
       "type": "string",
-      "enum": ["jest", "vitest", "none"],
+      "enum": ["vitest", "jest", "none"],
+      "default": "vitest",
       "description": "Test runner to use for unit tests.",
       "x-prompt": "What unit test runner should be used?"
     },

packages/remix/src/generators/library/schema.json

@@ -49,7 +49,7 @@
     },
     "unitTestRunner": {
       "type": "string",
-      "enum": ["jest", "vitest", "none"],
+      "enum": ["vitest", "jest", "none"],
       "description": "Test Runner to use for Unit Tests",
       "x-prompt": "What test runner should be used?",
       "default": "vitest"

packages/vite/src/generators/configuration/configuration.ts

@@ -163,6 +163,7 @@ export async function viteConfigurationGeneratorInternal(
       testTarget: 'test',
       skipFormat: true,
       addPlugin: schema.addPlugin,
+      compiler: schema.compiler,
     });
     tasks.push(vitestTask);
   }

packages/vite/src/generators/vitest/schema.d.ts

@@ -9,4 +9,5 @@ export interface VitestGeneratorSchema {
   testEnvironment?: 'node' | 'jsdom' | 'happy-dom' | 'edge-runtime' | string;
   addPlugin?: boolean;
   runtimeTsconfigFileName?: string;
+  compiler?: 'babel' | 'swc'; // default: babel
 }

packages/vite/src/generators/vitest/schema.json

@@ -54,6 +54,12 @@
     "runtimeTsconfigFileName": {
       "type": "string",
       "description": "The name of the project's tsconfig file that includes the runtime source files. If not provided, it will default to `tsconfig.lib.json` for libraries and `tsconfig.app.json` for applications."
+    },
+    "compiler": {
+      "type": "string",
+      "enum": ["babel", "swc"],
+      "default": "babel",
+      "description": "The compiler to use"
     }
   },
   "required": ["project"]

packages/vite/src/generators/vitest/vitest-generator.ts

@@ -46,6 +46,10 @@ export async function vitestGeneratorInternal(
   schema: VitestGeneratorSchema,
   hasPlugin = false
 ) {
+  // Setting default to jsdom since it is the most common use case (React, Web).
+  // The @nx/js:lib generator specifically sets this to node to be more generic.
+  schema.testEnvironment ??= 'jsdom';
+
   const tasks: GeneratorCallback[] = [];
 
   const { root, projectType } = readProjectConfiguration(tree, schema.project);
@@ -85,7 +89,11 @@ export async function vitestGeneratorInternal(
             "'react-dom'",
             "'react/jsx-runtime'",
           ],
-          imports: [`import react from '@vitejs/plugin-react'`],
+          imports: [
+            schema.compiler === 'swc'
+              ? `import react from '@vitejs/plugin-react-swc'`
+              : `import react from '@vitejs/plugin-react'`,
+          ],
           plugins: ['react()'],
           coverageProvider: schema.coverageProvider,
         },

packages/web/src/generators/application/application.ts

@@ -325,6 +325,7 @@ export async function applicationGeneratorInternal(host: Tree, schema: Schema) {
       inSourceTests: options.inSourceTests,
       skipFormat: true,
       addPlugin: options.addPlugin,
+      compiler: options.compiler,
     });
     tasks.push(vitestTask);
     createOrEditViteConfig(

packages/web/src/generators/application/schema.json

@@ -77,7 +77,8 @@
     },
     "unitTestRunner": {
       "type": "string",
-      "enum": ["jest", "vitest", "none"],
+      "enum": ["vitest", "jest", "none"],
+      "default": "vitest",
       "description": "Test runner to use for unit tests. Default value is 'jest' when using 'webpack' or 'none' as the bundler and 'vitest' when using 'vite' as the bundler"
     },
     "inSourceTests": {