fix(build): resolve rollupOptions.input paths

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

@@ -1,5 +1,6 @@
-import { resolveLibFilename } from '../build'
+import { resolveLibFilename, resolvePaths } from '../build'
 import { resolve } from 'path'
+import { resolveConfig } from '..'
 
 describe('resolveLibFilename', () => {
   test('custom filename function', () => {
@@ -65,3 +66,65 @@ describe('resolveLibFilename', () => {
     }).toThrow()
   })
 })
+
+describe('resolvePaths', () => {
+  test('resolve build.rollupOptions.input', async () => {
+    const config = await resolveConfig({
+      build: {
+        rollupOptions: {
+          input: 'packages/noname/index.html'
+        }
+      }
+    }, 'build', 'production')
+    const { input } = resolvePaths(config, config.build)
+
+    expect(input).toBe(resolve('packages/noname/index.html'))
+  })
+
+  test('resolve build.rollupOptions.input[]', async () => {
+    const config = await resolveConfig({
+      root: 'packages/noname',
+      build: {
+        rollupOptions: {
+          input: ['index.html']
+        }
+      }
+    }, 'build', 'production')
+    const { input } = resolvePaths(config, config.build)
+
+    const resolved = resolve('packages/noname/index.html')
+
+    expect(input).toStrictEqual([resolved])
+    expect(config.build.rollupOptions.input).toStrictEqual([resolved])
+  })
+
+  test('resolve index.html', async () => {
+    const config = await resolveConfig({
+      root: 'packages/noname',
+    }, 'build', 'production')
+    const { input } = resolvePaths(config, config.build)
+
+    expect(input).toBe(resolve('packages/noname/index.html'))
+  })
+
+  test('resolve build.outdir', async () => {
+    const config = await resolveConfig({ build: { outDir: 'packages/noname' } }, 'build', 'production')
+    const { outDir } = resolvePaths(config, config.build)
+
+    expect(outDir).toBe(resolve('packages/noname'))
+  })
+
+  test('resolve build.lib.entry', async () => {
+    const config = await resolveConfig({ build: { lib: { entry: 'packages/noname/index.html' } } }, 'build', 'production')
+    const { input } = resolvePaths(config, config.build)
+
+    expect(input).toBe(resolve('packages/noname/index.html'))
+  })
+
+  test('resolve build.ssr', async () => {
+    const config = await resolveConfig({ build: { ssr: 'packages/noname/ssr.ts' } }, 'build', 'production')
+    const { input } = resolvePaths(config, config.build)
+
+    expect(input).toBe(resolve('packages/noname/ssr.ts'))
+  })
+})

packages/vite/src/node/build.ts

@@ -329,6 +329,35 @@ export function resolveBuildPlugins(config: ResolvedConfig): {
   }
 }
 
+export function resolvePaths(config: ResolvedConfig, options: ResolvedConfig["build"]) {
+  const rollupOptions = options.rollupOptions
+  const libOptions = options.lib
+  const ssr = !!options.ssr
+
+  const resolve = (p: string) => path.resolve(config.root, p)
+
+  if (Array.isArray(rollupOptions?.input))
+    rollupOptions.input = rollupOptions.input.map(input => resolve(input))
+
+  const input = libOptions
+    ? libOptions.entry
+    : typeof options.ssr === 'string'
+    ? options.ssr
+    : rollupOptions?.input || 'index.html'
+
+  if (ssr && typeof input === 'string' && input.endsWith('.html')) {
+    throw new Error(
+      `rollupOptions.input should not be an html file when building for SSR. ` +
+        `Please specify a dedicated SSR entry.`
+    )
+  }
+
+  return {
+    input: typeof input === 'string' ? resolve(input) : input,
+    outDir: resolve(options.outDir)
+  }
+}
+
 /**
  * Track parallel build calls and only stop the esbuild service when all
  * builds are done. (#1098)
@@ -373,21 +402,7 @@ async function doBuild(
     )
   )
 
-  const resolve = (p: string) => path.resolve(config.root, p)
-  const input = libOptions
-    ? resolve(libOptions.entry)
-    : typeof options.ssr === 'string'
-    ? resolve(options.ssr)
-    : options.rollupOptions?.input || resolve('index.html')
-
-  if (ssr && typeof input === 'string' && input.endsWith('.html')) {
-    throw new Error(
-      `rollupOptions.input should not be an html file when building for SSR. ` +
-        `Please specify a dedicated SSR entry.`
-    )
-  }
-
-  const outDir = resolve(options.outDir)
+  const { input, outDir } = resolvePaths(config, options)
 
   // inject ssr arg to plugin load/transform hooks
   const plugins = (