fix: apply development|production condition on Vite 6 (#7301)

Co-authored-by: Vladimir Sheremet <sleuths.slews0s@icloud.com>

docs/guide/migration.md

@@ -129,6 +129,10 @@ expect(() => {
 
 See PR for more details: [#5876](https://github.com/vitest-dev/vitest/pull/5876).
 
+### `module` condition export is not resolved by default on Vite 6
+
+Vite 6 allows more flexible [`resolve.conditions`](https://vite.dev/config/shared-options#resolve-conditions) options and Vitest configures it to exclude `module` conditional export by default.
+
 ### `Custom` Type is Deprecated <Badge type="danger">API</Badge> {#custom-type-is-deprecated}
 
 The `Custom` type is now an alias for the `Test` type. Note that Vitest updated the public types in 2.1 and changed exported names to `RunnerCustomCase` and `RunnerTestCase`:

packages/vitest/src/node/plugins/index.ts

@@ -20,6 +20,7 @@ import { VitestOptimizer } from './optimizer'
 import { SsrReplacerPlugin } from './ssrReplacer'
 import {
   deleteDefineConfig,
+  getDefaultResolveOptions,
   hijackVitePluginInject,
   resolveFsAllow,
 } from './utils'
@@ -73,6 +74,8 @@ export async function VitestPlugin(
           open = testConfig.uiBase ?? '/__vitest__/'
         }
 
+        const resolveOptions = getDefaultResolveOptions()
+
         const config: ViteConfig = {
           root: viteConfig.test?.root || options.root,
           esbuild:
@@ -86,11 +89,8 @@ export async function VitestPlugin(
                   legalComments: 'inline',
                 },
           resolve: {
-            // by default Vite resolves `module` field, which not always a native ESM module
-            // setting this option can bypass that and fallback to cjs version
-            mainFields: [],
+            ...resolveOptions,
             alias: testConfig.alias,
-            conditions: ['node'],
           },
           server: {
             ...testConfig.api,
@@ -115,12 +115,7 @@ export async function VitestPlugin(
           // @ts-ignore Vite 6 compat
           environments: {
             ssr: {
-              resolve: {
-                // by default Vite resolves `module` field, which not always a native ESM module
-                // setting this option can bypass that and fallback to cjs version
-                mainFields: [],
-                conditions: ['node'],
-              },
+              resolve: resolveOptions,
             },
           },
           test: {

packages/vitest/src/node/plugins/utils.ts

@@ -6,6 +6,7 @@ import type {
 import type { DepsOptimizationOptions, InlineConfig } from '../types/config'
 import { dirname } from 'pathe'
 import { searchForWorkspaceRoot, version as viteVersion } from 'vite'
+import * as vite from 'vite'
 import { rootDir } from '../../paths'
 import { VitestCache } from '../cache'
 
@@ -147,3 +148,23 @@ export function resolveFsAllow(
     rootDir,
   ]
 }
+
+export function getDefaultResolveOptions(): vite.ResolveOptions {
+  return {
+    // by default Vite resolves `module` field, which is not always a native ESM module
+    // setting this option can bypass that and fallback to cjs version
+    mainFields: [],
+    // same for `module` condition and Vite 5 doesn't even allow excluding it,
+    // but now it's possible since Vite 6.
+    conditions: getDefaultServerConditions(),
+  }
+}
+
+function getDefaultServerConditions(): string[] {
+  const viteMajor = Number(viteVersion.split('.')[0])
+  if (viteMajor >= 6) {
+    const conditions: string[] = (vite as any).defaultServerConditions
+    return conditions.filter(c => c !== 'module')
+  }
+  return ['node']
+}

packages/vitest/src/node/plugins/workspace.ts

@@ -16,6 +16,7 @@ import { VitestOptimizer } from './optimizer'
 import { SsrReplacerPlugin } from './ssrReplacer'
 import {
   deleteDefineConfig,
+  getDefaultResolveOptions,
   hijackVitePluginInject,
   resolveFsAllow,
 } from './utils'
@@ -92,14 +93,12 @@ export function WorkspaceVitestPlugin(
           }
         }
 
+        const resolveOptions = getDefaultResolveOptions()
         const config: ViteConfig = {
           root,
           resolve: {
-            // by default Vite resolves `module` field, which not always a native ESM module
-            // setting this option can bypass that and fallback to cjs version
-            mainFields: [],
+            ...resolveOptions,
             alias: testConfig.alias,
-            conditions: ['node'],
           },
           esbuild: viteConfig.esbuild === false
             ? false
@@ -130,12 +129,7 @@ export function WorkspaceVitestPlugin(
           // @ts-ignore Vite 6 compat
           environments: {
             ssr: {
-              resolve: {
-                // by default Vite resolves `module` field, which not always a native ESM module
-                // setting this option can bypass that and fallback to cjs version
-                mainFields: [],
-                conditions: ['node'],
-              },
+              resolve: resolveOptions,
             },
           },
           test: {

packages/vitest/src/node/pool.ts

@@ -5,6 +5,7 @@ import type { TestSpecification } from './spec'
 import type { BuiltinPool, Pool } from './types/pool-options'
 import { isatty } from 'node:tty'
 import mm from 'micromatch'
+import { version as viteVersion } from 'vite'
 import { isWindows } from '../utils/env'
 import { createForksPool } from './pools/forks'
 import { createThreadsPool } from './pools/threads'
@@ -91,11 +92,14 @@ export function createPool(ctx: Vitest): ProcessPool {
 
   // in addition to resolve.conditions Vite also adds production/development,
   // see: https://github.com/vitejs/vite/blob/af2aa09575229462635b7cbb6d248ca853057ba2/packages/vite/src/node/plugins/resolve.ts#L1056-L1080
-  const potentialConditions = new Set([
-    'production',
-    'development',
-    ...ctx.vite.config.resolve.conditions,
-  ])
+  const viteMajor = Number(viteVersion.split('.')[0])
+  const potentialConditions = new Set(viteMajor >= 6
+    ? (ctx.vite.config.ssr.resolve?.conditions ?? [])
+    : [
+        'production',
+        'development',
+        ...ctx.vite.config.resolve.conditions,
+      ])
   const conditions = [...potentialConditions]
     .filter((condition) => {
       if (condition === 'production') {
@@ -106,6 +110,12 @@ export function createPool(ctx: Vitest): ProcessPool {
       }
       return true
     })
+    .map((condition) => {
+      if (viteMajor >= 6 && condition === 'development|production') {
+        return ctx.vite.config.isProduction ? 'production' : 'development'
+      }
+      return condition
+    })
     .flatMap(c => ['--conditions', c])
 
   // Instead of passing whole process.execArgv to the workers, pick allowed options.

pnpm-lock.yaml

@@ -1123,6 +1123,9 @@ importers:
 
   test/config:
     devDependencies:
+      '@vitest/test-dep-conditions':
+        specifier: file:./deps/test-dep-conditions
+        version: file:test/config/deps/test-dep-conditions
       tinyexec:
         specifier: ^0.3.2
         version: 0.3.2
@@ -4126,6 +4129,12 @@ packages:
   '@vitest/test-dep-cjs@file:test/core/deps/dep-cjs':
     resolution: {directory: test/core/deps/dep-cjs, type: directory}
 
+  '@vitest/test-dep-conditions-indirect@file:test/config/deps/test-dep-conditions-indirect':
+    resolution: {directory: test/config/deps/test-dep-conditions-indirect, type: directory}
+
+  '@vitest/test-dep-conditions@file:test/config/deps/test-dep-conditions':
+    resolution: {directory: test/config/deps/test-dep-conditions, type: directory}
+
   '@vitest/test-dep1@file:test/core/deps/dep1':
     resolution: {directory: test/core/deps/dep1, type: directory}
 
@@ -12719,6 +12728,12 @@ snapshots:
 
   '@vitest/test-dep-cjs@file:test/core/deps/dep-cjs': {}
 
+  '@vitest/test-dep-conditions-indirect@file:test/config/deps/test-dep-conditions-indirect': {}
+
+  '@vitest/test-dep-conditions@file:test/config/deps/test-dep-conditions':
+    dependencies:
+      '@vitest/test-dep-conditions-indirect': file:test/config/deps/test-dep-conditions-indirect
+
   '@vitest/test-dep1@file:test/core/deps/dep1': {}
 
   '@vitest/test-dep2@file:test/core/deps/dep2':

test/config/deps/test-dep-conditions-indirect/false.js

@@ -0,0 +1 @@
+export default false

test/config/deps/test-dep-conditions-indirect/package.json

@@ -0,0 +1,27 @@
+{
+  "name": "@vitest/test-dep-conditions-indirect",
+  "type": "module",
+  "private": true,
+  "exports": {
+    "./custom": {
+      "custom": "./true.js",
+      "default": "./false.js"
+    },
+    "./module": {
+      "module": "./true.js",
+      "default": "./false.js"
+    },
+    "./node": {
+      "node": "./true.js",
+      "default": "./false.js"
+    },
+    "./development": {
+      "development": "./true.js",
+      "default": "./false.js"
+    },
+    "./production": {
+      "production": "./true.js",
+      "default": "./false.js"
+    }
+  }
+}

test/config/deps/test-dep-conditions-indirect/true.js

@@ -0,0 +1 @@
+export default true

test/config/deps/test-dep-conditions/false.js

@@ -0,0 +1 @@
+export default false

test/config/deps/test-dep-conditions/indirect.js

@@ -0,0 +1,13 @@
+import conditionCustom from '@vitest/test-dep-conditions-indirect/custom'
+import conditionDevelopment from '@vitest/test-dep-conditions-indirect/development'
+import conditionModule from '@vitest/test-dep-conditions-indirect/module'
+import conditionNode from '@vitest/test-dep-conditions-indirect/node'
+import conditionProductioin from '@vitest/test-dep-conditions-indirect/production'
+
+export default {
+  conditionCustom,
+  conditionModule,
+  conditionNode,
+  conditionDevelopment,
+  conditionProductioin,
+}

test/config/deps/test-dep-conditions/inline.js

@@ -0,0 +1 @@
+export default !!import.meta.__IS_INLINE__

test/config/deps/test-dep-conditions/package.json

@@ -0,0 +1,32 @@
+{
+  "name": "@vitest/test-dep-conditions",
+  "type": "module",
+  "private": true,
+  "exports": {
+    "./custom": {
+      "custom": "./true.js",
+      "default": "./false.js"
+    },
+    "./module": {
+      "module": "./true.js",
+      "default": "./false.js"
+    },
+    "./node": {
+      "node": "./true.js",
+      "default": "./false.js"
+    },
+    "./development": {
+      "development": "./true.js",
+      "default": "./false.js"
+    },
+    "./production": {
+      "production": "./true.js",
+      "default": "./false.js"
+    },
+    "./inline": "./inline.js",
+    "./indirect": "./indirect.js"
+  },
+  "dependencies": {
+    "@vitest/test-dep-conditions-indirect": "file:../test-dep-conditions-indirect"
+  }
+}

test/config/deps/test-dep-conditions/true.js

@@ -0,0 +1 @@
+export default true

test/config/fixtures/conditions/basic.test.js

@@ -0,0 +1,37 @@
+import { test, expect } from 'vitest';
+import conditionCustom from '@vitest/test-dep-conditions/custom';
+import conditionModule from '@vitest/test-dep-conditions/module';
+import conditionNode from '@vitest/test-dep-conditions/node';
+import conditionDevelopment from '@vitest/test-dep-conditions/development';
+import conditionProduction from '@vitest/test-dep-conditions/production';
+import inline from '@vitest/test-dep-conditions/inline';
+import indirect from '@vitest/test-dep-conditions/indirect';
+
+import { viteVersion } from 'vitest/node'
+const viteMajor = Number(viteVersion.split('.')[0])
+
+test('conditions', () => {
+  expect({
+    conditionCustom,
+    conditionModule,
+    conditionNode,
+    conditionDevelopment,
+    conditionProduction,
+    indirect
+  }).toEqual(
+    {
+      conditionCustom: true,
+      "conditionDevelopment": true,
+      "conditionModule": viteMajor <= 5,
+      "conditionNode": true,
+      "conditionProduction": false,
+      "indirect": {
+        conditionCustom: true,
+        "conditionDevelopment": true,
+        "conditionModule": viteMajor <= 5 && inline,
+        "conditionNode": true,
+        "conditionProductioin": false,
+      },
+    }
+  )
+})

test/config/fixtures/conditions/vite.config.ts

@@ -0,0 +1,15 @@
+import { defineConfig } from "vitest/config"
+
+export default defineConfig({
+  define: {
+    'import.meta.__IS_INLINE__': 'true',
+  },
+  resolve: {
+    conditions: ['custom'],
+  },
+  ssr: {
+    resolve: {
+      conditions: ['custom'],
+    },
+  }
+})

test/config/package.json

@@ -6,6 +6,7 @@
     "test": "vitest --typecheck.enabled"
   },
   "devDependencies": {
+    "@vitest/test-dep-conditions": "file:./deps/test-dep-conditions",
     "tinyexec": "^0.3.2",
     "vite": "latest",
     "vitest": "workspace:*"

test/config/test/conditions-cli.test.ts

@@ -53,6 +53,11 @@ test('correctly imports external dependencies with a custom condition', async ()
     resolve: {
       conditions: ['custom'],
     },
+    ssr: {
+      resolve: {
+        conditions: ['custom'],
+      },
+    },
     define: {
       TEST_CONDITION: '"custom"',
     },
@@ -60,3 +65,37 @@ test('correctly imports external dependencies with a custom condition', async ()
 
   expect(stderr).toBe('')
 })
+
+test('conditions (external)', async () => {
+  const { stderr } = await runVitest({
+    root: 'fixtures/conditions',
+  })
+
+  expect(stderr).toBe('')
+})
+
+test('conditions (inline direct)', async () => {
+  const { stderr } = await runVitest({
+    root: 'fixtures/conditions',
+    server: {
+      deps: {
+        inline: ['@vitest/test-dep-conditions'],
+      },
+    },
+  })
+
+  expect(stderr).toBe('')
+})
+
+test('conditions (inline indirect)', async () => {
+  const { stderr } = await runVitest({
+    root: 'fixtures/conditions',
+    server: {
+      deps: {
+        inline: ['@vitest/test-dep-conditions', '@vitest/test-dep-conditions-indirect'],
+      },
+    },
+  })
+
+  expect(stderr).toBe('')
+})