fix(module-runner): delay function eval until module runner instantia…

…tion (#18480)
vitejs · Oct 28, 2024 · 472afbd · 472afbd
1 parent 915cd7f
commit 472afbd
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Showing 2 changed files with 11 additions and 6 deletions.
diff --git a/packages/vite/src/module-runner/esmEvaluator.ts b/packages/vite/src/module-runner/esmEvaluator.ts
@@ -1,6 +1,6 @@
 import {
   AsyncFunction,
-  asyncFunctionDeclarationPaddingLineCount,
+  getAsyncFunctionDeclarationPaddingLineCount,
 } from '../shared/utils'
 import {
   ssrDynamicImportKey,
@@ -12,7 +12,7 @@ import {
 import type { ModuleEvaluator, ModuleRunnerContext } from './types'
 
 export class ESModulesEvaluator implements ModuleEvaluator {
-  startOffset = asyncFunctionDeclarationPaddingLineCount
+  startOffset = getAsyncFunctionDeclarationPaddingLineCount()
 
   async runInlinedModule(
     context: ModuleRunnerContext,

diff --git a/packages/vite/src/shared/utils.ts b/packages/vite/src/shared/utils.ts
@@ -56,9 +56,14 @@ export function withTrailingSlash(path: string): string {
 export const AsyncFunction = async function () {}.constructor as typeof Function
 
 // https://github.com/nodejs/node/issues/43047#issuecomment-1564068099
-export const asyncFunctionDeclarationPaddingLineCount =
-  /** #__PURE__ */ (() => {
+let asyncFunctionDeclarationPaddingLineCount: number | undefined
+
+export function getAsyncFunctionDeclarationPaddingLineCount(): number {
+  if (typeof asyncFunctionDeclarationPaddingLineCount === 'undefined') {
     const body = '/*code*/'
     const source = new AsyncFunction('a', 'b', body).toString()
-    return source.slice(0, source.indexOf(body)).split('\n').length - 1
-  })()
+    asyncFunctionDeclarationPaddingLineCount =
+      source.slice(0, source.indexOf(body)).split('\n').length - 1
+  }
+  return asyncFunctionDeclarationPaddingLineCount
+}