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### What?
Now that @phanect added support for ESM PostCSS config files in PR
#63109 (original issue #34448), PostCSS can use ESM config by default.
It needs to use an `.mjs` extension by default because `create-next-app`
scaffolds CommonJS apps by default.
This will also work with ESM projects which have added `"type":
"module"` in their `package.json`
### Why?
1. To convert one more file to ESM
2. To use the modern format
3. To follow other similar migrations that have taken place in the
Next.js codebase (eg. `next.config.mjs`)
### How?
- Change file extensions from `.cjs` to `.mjs` (change similar to PR
#58380)
- Change module format from CommonJS to ESM
- Add type for the config, for users who enable `checkJs: true` in
`tsconfig.json`
Co-authored-by: Sam Ko <sam@vercel.com>
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### What?
### Why?
### How?
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### What?
Prevent confusing error messages when changing to `"type": "module"` in
`package.json`
```
./node_modules/next/dist/build/webpack/loaders/css-loader/src/index.js??ruleSet[1].rules[2].oneOf[8].use[1]!./node_modules/next/dist/build/webpack/loaders/postcss-loader/src/index.js??ruleSet[1].rules[2].oneOf[8].use[2]!./src/styles/index.css
Error [ERR_REQUIRE_ESM]: require() of ES Module /path/to/my/repo/components/postcss.config.js from /path/to/my/repo/components/node_modules/next/dist/lib/find-config.js not supported.
Instead change the require of postcss.config.js in /path/to/my/repo/components/node_modules/next/dist/lib/find-config.js to a dynamic import() which is available in all CommonJS modules.
```
### Why?
Even though PostCSS itself [supports ESM and TypeScript configuration
files](https://github.com/postcss/postcss-load-config/issues/230),
Next.js itself does not (because of `next/lib/find-config`):
- https://github.com/vercel/next.js/issues/34448
### How?
By switching to `.cjs`, the config will stay recognized as CommonJS even
after switching to `"type": "module"` in `package.json`
cc @balazsorban44
---------
Co-authored-by: Sam Ko <sam@vercel.com>
### What?
This PR removes an unnecessary await keyword from the
writeSema.release() call. The release method does not return a promise,
hence awaiting it is not required.
### Why?
Awaiting on writeSema.release() which does not return a promise can lead
to confusion and potentially hinder performance. By removing the await
keyword, the code is simplified and aligns with the intended synchronous
nature of the release method.
### How?
Reviewed the writeSema.release() method implementation to confirm it
does not return a promise.
Removed the await keyword from the writeSema.release() call to ensure
the code correctly reflects the synchronous operation.
Co-authored-by: righthot <righthot@everon.co.kr>
Co-authored-by: Steven <steven@ceriously.com>
