fix(config): workaround failure creating temporary file (take 2)

If node_modules is not writable, loadConfigFromBundledFile fails to
write its temp file and vite aborts with an exception.

This was previously fixed in #13269, but was reverted after several
reports of failure to load config with relative imports (see #13631
and #13730).

Instead of replacing the current code, try to load from string only
as a workaround, when the directory doesn't exist.

This should solve the case of unwritable node_modules when relative
imports are not used without breaking anything that works.

Author: orgads

packages/vite/src/node/config.ts

@@ -2043,11 +2043,20 @@ async function loadConfigFromBundledFile(
           `.vite-temp/${path.basename(fileName)}.${hash}.mjs`,
         )
       : `${fileName}.${hash}.mjs`
-    await fsp.writeFile(tempFileName, bundledCode)
     try {
-      return (await import(pathToFileURL(tempFileName).href)).default
-    } finally {
-      fs.unlink(tempFileName, () => {}) // Ignore errors
+      await fsp.writeFile(tempFileName, bundledCode)
+      try {
+        return (await import(pathToFileURL(tempFileName).href)).default
+      } finally {
+        fs.unlink(tempFileName, () => {}) // Ignore errors
+      }
+    } catch (e) {
+      if (e.code === 'EACCES') {
+        const url = `data:text/javascript;base64,${Buffer.from(bundledCode).toString('base64')}`;
+        return (await import(url)).default;
+      } else {
+        throw e;
+      }
     }
   }
   // for cjs, we can register a custom loader via `_require.extensions`