typescript-parser is not changed in flat config

[appano1]

Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.

What version of ESLint are you using?

8.57.0

What version of typescript-eslint-parser-for-extra-files are you using?

• typescript-eslint-parser-for-extra-files@0.6.0

What did you do?

Configuration

<!-- Paste your configuration here -->
import tsParser from "typescript-eslint-parser-for-extra-files";
import vueParser from "vue-eslint-parser";

[
  ...tseslint.configs.recommended,
  {
    languageOptions: {
      parser: tsParser,
    },
  },
  {
    files: ["**/*.vue"],
    languageOptions: {
      parser: vueParser,
      parserOptions: {
        parser: tsParser,
      },
    },
  },
]

What did you expect to happen?

When I set the config with flat config with typescript-eslint, I expected that typescript eslint will uses typescript-eslint-parser-for-extra-files.

What actually happened?

But actually, it seems that tyepscript-eslint uses it's own parser. I don't know why the following configs don't override parser.

https://github.com/typescript-eslint/typescript-eslint/blob/6e29721d699f8c62e23f39b9f07cf928108adfac/packages/typescript-eslint/src/index.ts#L31-L45

Link to GitHub Repo with Minimal Reproducible Example

https://github.com/appano1/parser-in-flat-config

Additional comments

I think some limitations need to be added in README.md or creating a configuration builder need to be added

[appano1]

Oh sorry my link was wrong. I've edited the link now.

[pboling]

I am having the same or similar issue with flat config. Does this project work with flat config? All the docs use legacy cofnig.

[n0099]

When using flat config, packages @typescript-eslint/{parser,eslint-plugin} should be replaced by the merged typescript-eslint since they only provide flat .configs in that package: typescript-eslint/typescript-eslint#7935

But typescript-eslint-parser-for-extra-files is still using @typescript-eslint/{parser,eslint-plugin} when the user only have typescript-eslint leading to cannot resolve these packages.

So currently we may only use @eslint/eslintrc: https://eslint.org/blog/2024/05/eslint-compatibility-utilities/

import { FlatCompat } from '@eslint/eslintrc';

const compat = new FlatCompat();

export default [
    ...compat.extends( // https://github.com/ota-meshi/typescript-eslint-parser-for-extra-files/issues/95
        'plugin:@typescript-eslint/strict-type-checked',
        'plugin:@typescript-eslint/stylistic-type-checked',
    ),
    {
        files: ['**/*.ts'],
        languageOptions: { parser: typescriptESLintParserForExtraFiles },
    },
    {
        files: ['**/*.vue'],
        languageOptions: {
            parser: vueESLintParser,
            parserOptions: {
                parser: typescriptESLintParserForExtraFiles,
                project: ['./tsconfig.json', './tsconfig.node.json'],
                tsconfigRootDir: import.meta.dirname,
            },
        },
    },
];