fix(module-runner): handle non-ascii characters in base64 sourcemaps

packages/vite/src/module-runner/utils.ts

@@ -1,10 +1,10 @@
 import * as pathe from 'pathe'
 import { isWindows } from '../shared/utils'
 
-export const decodeBase64: typeof atob =
-  typeof atob !== 'undefined'
-    ? atob
-    : (str: string) => Buffer.from(str, 'base64').toString('utf-8')
+export const decodeBase64: (base64: string) => string =
+  typeof Buffer === 'function' && typeof Buffer.from === 'function'
+    ? (str: string) => Buffer.from(str, 'base64').toString('utf-8')
+    : atob
 
 const CHAR_FORWARD_SLASH = 47
 const CHAR_BACKWARD_SLASH = 92