fix: support resolving top-level input option with plugins

packages/vite/src/node/__tests__/build.spec.ts

@@ -112,6 +112,36 @@ describe('build', () => {
     expect(chunk?.code).toContain('from-top-level-input')
   })
 
+  test('top-level input can be a virtual module for build', async () => {
+    const input = 'virtual:entry'
+    const resolvedInput = `\0${input}`
+    const result = (await build({
+      root: resolve(dirname, 'packages/build-project'),
+      logLevel: 'silent',
+      input,
+      build: {
+        write: false,
+      },
+      plugins: [
+        {
+          name: 'virtual-entry',
+          resolveId(id) {
+            if (id === input) {
+              return resolvedInput
+            }
+          },
+          load(id) {
+            if (id === resolvedInput) {
+              return `console.log('from-virtual-top-level-input')`
+            }
+          },
+        },
+      ],
+    })) as RolldownOutput
+    const chunk = result.output.find((o) => o.type === 'chunk')
+    expect(chunk?.code).toContain('from-virtual-top-level-input')
+  })
+
   test('file hash should change when pure css chunk changes', async () => {
     const buildProject = async (cssColor: string) => {
       return (await build({

packages/vite/src/node/__tests__/config.spec.ts

@@ -1175,16 +1175,11 @@ describe('resolveConfig', () => {
     )
   })
 
-  const resolveInputFromRoot = (p: string) =>
-    normalizePath(path.resolve(process.cwd(), p))
-
   test('top-level input applies to the client environment only (non-inherit)', async () => {
     const config = await resolveConfig({ input: 'src/main.ts' }, 'serve')
 
-    expect(config.input).toBe(resolveInputFromRoot('src/main.ts'))
-    expect(config.environments.client.input).toBe(
-      resolveInputFromRoot('src/main.ts'),
-    )
+    expect(config.input).toBe('src/main.ts')
+    expect(config.environments.client.input).toBe('src/main.ts')
     expect(
       config.environments.client.build.rolldownOptions.input,
     ).toBeUndefined()
@@ -1203,59 +1198,31 @@ describe('resolveConfig', () => {
       'serve',
     )
 
-    expect(config.environments.client.input).toBe(
-      resolveInputFromRoot('src/main.ts'),
-    )
-    expect(config.environments.ssr.input).toBe(
-      resolveInputFromRoot('src/entry-server.ts'),
-    )
+    expect(config.environments.client.input).toBe('src/main.ts')
+    expect(config.environments.ssr.input).toBe('src/entry-server.ts')
   })
 
-  test('resolves array input to absolute paths', async () => {
+  test('keeps array input relative to the root', async () => {
     const config = await resolveConfig(
       { input: ['src/a.ts', 'src/b.ts'] },
       'serve',
     )
 
-    expect(config.environments.client.input).toEqual([
-      resolveInputFromRoot('src/a.ts'),
-      resolveInputFromRoot('src/b.ts'),
-    ])
+    expect(config.environments.client.input).toEqual(['src/a.ts', 'src/b.ts'])
   })
 
-  test('resolves record input to absolute paths', async () => {
+  test('keeps record input relative to the root', async () => {
     const config = await resolveConfig(
       { input: { main: 'src/a.ts', admin: 'src/b.ts' } },
       'serve',
     )
 
     expect(config.environments.client.input).toEqual({
-      main: resolveInputFromRoot('src/a.ts'),
-      admin: resolveInputFromRoot('src/b.ts'),
+      main: 'src/a.ts',
+      admin: 'src/b.ts',
     })
   })
 
-  test('adds input to server.fs.allow by default', async () => {
-    const inputs = {
-      main: resolveInputFromRoot('src/a.ts'),
-      admin: resolveInputFromRoot('src/b.ts'),
-    }
-    const config = await resolveConfig(
-      { input: { main: 'src/a.ts', admin: 'src/b.ts' } },
-      'serve',
-    )
-
-    expect(config.server.fs.allow).toStrictEqual(
-      expect.arrayContaining(Object.values(inputs)),
-    )
-  })
-
-  test('adds the default index.html input to server.fs.allow', async () => {
-    const config = await resolveConfig({}, 'serve')
-
-    expect(config.server.fs.allow).toContain(resolveInputFromRoot('index.html'))
-  })
-
   test('reserves glob characters in input', async () => {
     const cases: { name: string; input: UserConfig['input'] }[] = [
       { name: 'wildcard', input: 'src/*.ts' },
@@ -1286,17 +1253,17 @@ describe('resolveConfig', () => {
       {
         name: 'glob',
         input: 'src/\\*.ts',
-        expected: resolveInputFromRoot('src/*.ts'),
+        expected: 'src/*.ts',
       },
       {
         name: 'array element',
         input: ['src/\\*.ts'],
-        expected: [resolveInputFromRoot('src/*.ts')],
+        expected: ['src/*.ts'],
       },
       {
         name: 'record',
         input: { main: 'src/\\*.ts' },
-        expected: { main: resolveInputFromRoot('src/*.ts') },
+        expected: { main: 'src/*.ts' },
       },
     ]
 
@@ -1319,14 +1286,14 @@ describe('resolveConfig', () => {
       {
         name: 'special characters',
         input: 'src/a-b_c$.ts',
-        expected: resolveInputFromRoot('src/a-b_c$.ts'),
+        expected: 'src/a-b_c$.ts',
       },
       ...(isWindows
         ? [
             {
               name: 'windows path',
               input: 'src\\foo.ts',
-              expected: resolveInputFromRoot('src/foo.ts'),
+              expected: 'src\\foo.ts',
             },
           ]
         : []),
@@ -2047,7 +2014,6 @@ describe('resolveServerOptions', () => {
     const resolved = await resolveServerOptions(
       '/root',
       { allowedHosts: [] },
-      undefined,
       logger,
     )
     expect(resolved.allowedHosts).toEqual(['example.com'])
@@ -2059,7 +2025,6 @@ describe('resolveServerOptions', () => {
     const resolved = await resolveServerOptions(
       '/root',
       { allowedHosts: [] },
-      undefined,
       logger,
     )
     expect(resolved.allowedHosts).toEqual([
@@ -2075,7 +2040,6 @@ describe('resolveServerOptions', () => {
     const resolved = await resolveServerOptions(
       '/root',
       { allowedHosts: [] },
-      undefined,
       logger,
     )
     expect(resolved.allowedHosts).toEqual([
@@ -2091,7 +2055,6 @@ describe('resolveServerOptions', () => {
     const resolved = await resolveServerOptions(
       '/root',
       { allowedHosts: [] },
-      undefined,
       logger,
     )
     expect(resolved.allowedHosts).toEqual(['example.com', 'test.com'])
@@ -2102,7 +2065,6 @@ describe('resolveServerOptions', () => {
     const resolved = await resolveServerOptions(
       '/root',
       { allowedHosts: ['existing.com'] },
-      undefined,
       logger,
     )
     expect(resolved.allowedHosts).toEqual([
@@ -2117,7 +2079,6 @@ describe('resolveServerOptions', () => {
     const resolved = await resolveServerOptions(
       '/root',
       { allowedHosts: true },
-      undefined,
       logger,
     )
     expect(resolved.allowedHosts).toBe(true)
@@ -2130,7 +2091,6 @@ describe('resolveServerOptions', () => {
       const resolved = await resolveServerOptions(
         '/root',
         { allowedHosts: [] },
-        undefined,
         logger,
       )
       expect(resolved.allowedHosts).toEqual([])

packages/vite/src/node/__tests__/dev.spec.ts

@@ -1,8 +1,11 @@
-import { afterEach, describe, expect, test } from 'vitest'
+import path from 'node:path'
+import { afterEach, describe, expect, test, vi } from 'vitest'
 import type { ResolvedServerUrls } from 'vite'
 import { createServer, resolveConfig } from '..'
 import type { ViteDevServer } from '..'
 import { promiseWithResolvers } from '../../shared/utils'
+import { createLogger } from '../logger'
+import { normalizePath } from '../utils'
 
 describe('resolveBuildEnvironmentOptions in dev', () => {
   test('build.rolldownOptions should not have input in lib', async () => {
@@ -28,6 +31,129 @@ describe('the dev server', () => {
     await server?.close()
   })
 
+  test('resolves each environment input as a safe module', async () => {
+    const root = path.join(import.meta.dirname, 'fixtures', 'input-option')
+    const clientEntry = normalizePath(path.join(root, 'client-entry.js'))
+    const ssrEntry = normalizePath(path.join(root, 'ssr-entry.js'))
+
+    server = await createServer({
+      configFile: false,
+      root,
+      input: 'virtual:client-entry',
+      environments: {
+        ssr: { input: { main: 'virtual:ssr-entry' } },
+      },
+      optimizeDeps: { noDiscovery: true },
+      server: { fs: { allow: [] }, middlewareMode: true, ws: false },
+      plugins: [
+        {
+          name: 'resolve-environment-entries',
+          resolveId(id) {
+            if (id === `virtual:${this.environment.name}-entry`) {
+              return this.environment.name === 'client' ? clientEntry : ssrEntry
+            }
+          },
+        },
+      ],
+    })
+
+    expect(server.config.safeModulePaths).toStrictEqual(new Set([clientEntry]))
+    await server.environments.ssr.pluginContainer.buildStart()
+    expect(server.config.safeModulePaths).toStrictEqual(
+      new Set([clientEntry, ssrEntry]),
+    )
+  })
+
+  test('does not mark an external environment input as safe', async () => {
+    const root = path.join(import.meta.dirname, 'fixtures', 'input-option')
+    const externalEntry = normalizePath(path.join(root, 'external-entry.js'))
+
+    server = await createServer({
+      configFile: false,
+      root,
+      input: 'virtual:external-entry',
+      optimizeDeps: { noDiscovery: true },
+      server: { fs: { allow: [] }, middlewareMode: true, ws: false },
+      plugins: [
+        {
+          name: 'external-environment-entry',
+          resolveId(id) {
+            if (id === 'virtual:external-entry') {
+              return { id: externalEntry, external: true }
+            }
+          },
+        },
+      ],
+    })
+
+    expect(server.config.safeModulePaths).not.toContain(externalEntry)
+  })
+
+  test('silently resolves index.html as the fallback for every environment', async () => {
+    const root = path.join(import.meta.dirname, 'fixtures', 'input-option')
+    const clientEntry = normalizePath(path.join(root, 'client-index.html'))
+    const resolvedEnvironments = new Set<string>()
+    const logger = createLogger('silent')
+    logger.warn = vi.fn()
+
+    server = await createServer({
+      configFile: false,
+      root,
+      customLogger: logger,
+      optimizeDeps: { noDiscovery: true },
+      server: { fs: { allow: [] }, middlewareMode: true, ws: false },
+      plugins: [
+        {
+          name: 'resolve-environment-index',
+          resolveId(id) {
+            if (id !== 'index.html') return
+            resolvedEnvironments.add(this.environment.name)
+            if (this.environment.name === 'ssr') {
+              throw new Error('ssr does not have an HTML entry')
+            }
+            return clientEntry
+          },
+        },
+      ],
+    })
+
+    expect(resolvedEnvironments).toStrictEqual(new Set(['client']))
+    await server.environments.ssr.pluginContainer.buildStart()
+    expect(resolvedEnvironments).toStrictEqual(new Set(['client', 'ssr']))
+    expect(server.config.safeModulePaths).toStrictEqual(new Set([clientEntry]))
+    expect(logger.warn).not.toHaveBeenCalled()
+  })
+
+  test('does not ignore buildStart errors while resolving fallback inputs', async () => {
+    server = await createServer({
+      configFile: false,
+      root: path.join(import.meta.dirname, 'fixtures', 'input-option'),
+      logLevel: 'silent',
+      optimizeDeps: { noDiscovery: true },
+      plugins: [
+        {
+          name: 'failing-build-start',
+          perEnvironmentStartEndDuringDev: true,
+          buildStart() {
+            if (this.environment.name === 'ssr') {
+              throw new Error('buildStart failed')
+            }
+          },
+        },
+      ],
+      server: {
+        fs: { allow: [] },
+        middlewareMode: true,
+        watch: null,
+        ws: false,
+      },
+    })
+
+    await expect(
+      server.environments.ssr.pluginContainer.buildStart(),
+    ).rejects.toThrow('buildStart failed')
+  })
+
   test('resolves the server URLs before the httpServer listening events are called', async () => {
     expect.assertions(1)