Add support to the new eslint.config.js format

[Gabriel-Dias-Oliveira]

Feature Proposal

Recently, Eslint received a new configuration file format Eslint flat config. It would be nice if the Eslint plugin recognized it as a valid configuration file.
I tried to use this, however, after setup everything up, I was able to use the rules on the format, but the webpack was not recognizing it as a valid file.
The following message was showing up:
ERROR in [eslint] No ESLint configuration found in...

Since I don't receive this error while using a .json file and all the rules are running okay, I'd say that the plugin don't support this type of file.

Feature Use Case

This feature will be very useful since the Eslint flat config seems to be promising and easier to maintain.

Please paste the results of npx webpack-cli info here, and mention other relevant information

System:
OS: Windows 10 10.0.19043
CPU: (8) x64 Intel(R) Core(TM) i5-10210U CPU @ 1.60GHz
Memory: 5.32 GB / 15.78 GB
Binaries:
Node: 16.18.0 - C:\Program Files\nodejs\node.EXE
npm: 8.19.2 - C:\Program Files\nodejs\npm.CMD
Browsers:
Edge: Spartan (44.19041.1266.0), Chromium (106.0.1370.52)
Internet Explorer: 11.0.19041.1566
Packages:
copy-webpack-plugin: ^11.0.0 => 11.0.0
esbuild-loader: ^2.20.0 => 2.20.0
eslint-webpack-plugin: ^3.2.0 => 3.2.0
file-loader: ^6.2.0 => 6.2.0
html-loader: ^4.2.0 => 4.2.0
html-loader-jest: ^0.2.1 => 0.2.1
html-webpack-plugin: ^5.5.0 => 5.5.0
raw-loader: ^4.0.2 => 4.0.2
webpack: ^5.74.0 => 5.74.0
webpack-cli: ^4.10.0 => 4.10.0
webpack-ext-reloader: ^1.1.9 => 1.1.9
webpackbar: ^5.0.2 => 5.0.2
zip-webpack-plugin: ^4.0.1 => 4.0.1

[pgnd]

similarly, updated

Operating System: Linux 6.2 Fedora Linux 38 (Thirty Eight)
Node Version: v18.16.0
NPM Version: 9.5.1
webpack Version: 5.80.0
eslint Version: 8.39.0
eslint-webpack-plugin Version: 4.0.1

cd /path/to/app
ls -al eslint.* webpack.*
	-rw------- 1 wwwrun www 8.2K Apr 25 08:03 webpack.config.mjs
	-rw-rw---- 1 wwwrun www 3.1K Apr 24 12:28 eslint.config.js

yarn webpack --mode=development --progress --profile
	...
	ERROR in [eslint] No ESLint configuration found in /path/to/app/assets/js.

	webpack 5.80.0 compiled with 1 error in 422 ms

cat eslint.config.js

	import js from "@eslint/js";
	import { FlatCompat } from "@eslint/eslintrc";
	import path from "path";
	import { fileURLToPath } from "url";
	const __filename = fileURLToPath(import.meta.url);
	const __dirname = path.dirname(__filename);
	const compat = new FlatCompat({ baseDirectory: __dirname });
	export default [
		{
			ignores: [
			...
	...

-->

• option to find/recognize/support existing eslint.config.js flat config
• option to explicitly specify path-to-config

[alexander-akait]

PR welcome

[lesha38]

Good day! Can you tell me when to expect the release of this feature?

[zayne-wang]

@alexander-akait

Good day!

I thought this feature should be released ASAP. Current version (4.0.1) on npm still not have this feature, but the document has shown the feature has been included indeed. This is a huge misleading for people using this plugin.

[alexander-akait]

Oh, let's do release 😄

[alexander-akait]

Fixed https://github.com/webpack-contrib/eslint-webpack-plugin/releases/tag/v4.1.0