perf: lazy load rollup/parseAst

packages/vite/src/node/index.ts

@@ -1,7 +1,7 @@
 import type * as Rollup from 'rollup'
 
 export type { Rollup }
-export { parseAst, parseAstAsync } from 'rollup/parseAst'
+export { initRollupParseAst, parseAst, parseAstAsync } from './utils'
 export {
   defineConfig,
   loadConfigFromFile,

packages/vite/src/node/plugins/assetImportMetaUrl.ts

@@ -5,6 +5,7 @@ import type { Plugin } from '../plugin'
 import type { ResolvedConfig } from '../config'
 import type { ResolveFn } from '../'
 import {
+  initRollupParseAst,
   injectQuery,
   isParentDirectory,
   slash,
@@ -55,6 +56,8 @@ export function assetImportMetaUrlPlugin(config: ResolvedConfig): Plugin {
           /\bnew\s+URL\s*\(\s*('[^']+'|"[^"]+"|`[^`]+`)\s*,\s*import\.meta\.url\s*(?:,\s*)?\)/dg
         const cleanString = stripLiteral(code)
 
+        await initRollupParseAst()
+
         let match: RegExpExecArray | null
         while ((match = assetImportMetaUrlRE.exec(cleanString))) {
           const [[startIndex, endIndex], [urlStart, urlEnd]] = match.indices!

packages/vite/src/node/server/pluginContainer.ts

@@ -33,7 +33,6 @@ import fs from 'node:fs'
 import { join } from 'node:path'
 import { performance } from 'node:perf_hooks'
 import { VERSION as rollupVersion } from 'rollup'
-import { parseAst as rollupParseAst } from 'rollup/parseAst'
 import type {
   AsyncPluginHooks,
   CustomPluginOptions,
@@ -73,6 +72,7 @@ import {
   isObject,
   normalizePath,
   numberToPos,
+  parseAst,
   prettifyUrl,
   timeFrom,
   unwrapId,
@@ -302,7 +302,7 @@ export async function createPluginContainer(
     }
 
     parse(code: string, opts: any) {
-      return rollupParseAst(code, opts)
+      return parseAst(code, opts)
     }
 
     async resolve(

packages/vite/src/node/utils.ts

@@ -17,7 +17,7 @@ import debug from 'debug'
 import type { Alias, AliasOptions } from 'dep-types/alias'
 import type MagicString from 'magic-string'
 
-import type { TransformResult } from 'rollup'
+import type { AstNode, ParseAst, ParseAstAsync, TransformResult } from 'rollup'
 import { createFilter as _createFilter } from '@rollup/pluginutils'
 import {
   CLIENT_ENTRY,
@@ -41,6 +41,46 @@ import {
 } from './packages'
 import type { CommonServerOptions } from '.'
 
+let rollupParseAst: ParseAst
+let rollupParseAstAsync: ParseAstAsync
+let rollupInited: Promise<any> | boolean = false
+export async function initRollupParseAst(): Promise<any | boolean> {
+  if (!rollupInited) {
+    const importRollupParseAst = import('rollup/parseAst')
+    rollupInited = importRollupParseAst
+    const { parseAst, parseAstAsync } = await importRollupParseAst
+    rollupParseAst = parseAst
+    rollupParseAstAsync = parseAstAsync
+    rollupInited = true
+  }
+  return rollupInited
+}
+export function parseAst(
+  code: string,
+  options?: {
+    allowReturnOutsideFunction?: boolean
+  },
+): AstNode {
+  if (!rollupInited) {
+    throw new Error(
+      `rollup/parseAst is not initialized yet, call initRollupParseAst() first`,
+    )
+  }
+  return rollupParseAst(code, options)
+}
+
+export async function parseAstAsync(
+  code: string,
+  options?: {
+    allowReturnOutsideFunction?: boolean
+  },
+): Promise<AstNode> {
+  if (rollupInited === false) {
+    await initRollupParseAst()
+  }
+  return rollupParseAstAsync(code, options)
+}
+
 /**
  * Inlined to keep `@rollup/pluginutils` in devDependencies
  */