Revert "fix: unexpected config temporary file (#13269)"

This reverts commit ff3ce31.

packages/vite/src/node/config.ts

@@ -1150,17 +1150,18 @@ async function loadConfigFromBundledFile(
 ): Promise<UserConfigExport> {
  // for esm, before we can register loaders without requiring users to run node
  // with --experimental-loader themselves, we have to do a hack here:
- // convert to base64, load it with native Node ESM.
+ // write it to disk, load it with native Node ESM, then delete the file.
  if (isESM) {
+ const fileBase = `${fileName}.timestamp-${Date.now()}-${Math.random()
+ .toString(16)
+ .slice(2)}`
+ const fileNameTmp = `${fileBase}.mjs`
+ const fileUrl = `${pathToFileURL(fileBase)}.mjs`
+ await fsp.writeFile(fileNameTmp, bundledCode)
  try {
- return (
- await dynamicImport(
- 'data:text/javascript;base64,' +
- Buffer.from(bundledCode).toString('base64'),
- )
- ).default
- } catch (e) {
- throw new Error(`${e.message} at ${fileName}`)
+ return (await dynamicImport(fileUrl)).default
+ } finally {
+ fs.unlink(fileNameTmp, () => {}) // Ignore errors
  }
  }
  // for cjs, we can register a custom loader via `_require.extensions`