Add eslint.config.ts to FLAT_CONFIG_FILENAMES

[f-lawe]

Tell us about your environment

• ESLint version: 9.23.0
• eslint-plugin-vue version: 10.0.0
• eslint-plugin-vue-i18n version: 4.0.0
• Node version: 22.13.1

The problem you want to solve.
@intlify/vue-i18n/no-unused-keys can't detect key usages because it can't find the ESLint config (and because of that, can't find file parsers).

Your take on the correct solution to problem.
If I manually add eslint.config.ts to FLAT_CONFIG_FILENAMES, everything work!

Additional context

[f-lawe]

@ota-meshi I saw your tags, I'll try to open a PR in the next few days 👍🏻

[ChrizzDF]

Hey there!
My @intlify/vue-i18n/no-unused-keys also doesn't seem to work :(

If I manually add eslint.config.ts to FLAT_CONFIG_FILENAMES, everything work!

Can you please share the code how you did that?

[f-lawe]

Oh, yes, but that's a very dirty function, called in my eslint.config.ts:

export const patchVueI18n = (cwd = '.') => {
  const path = cwd
    + '/node_modules/@intlify/eslint-plugin-vue-i18n'
    + '/dist/utils/parser-config-resolver/should-use-flat-config.js';

  try {
    const data = fs.readFileSync(path, 'utf8');
    const content = data.replace('\'eslint.config.js\'', '\'eslint.config.ts\'');
    fs.writeFileSync(path, content);
  }
  catch (err) {
    console.log(err);
  }
};

I won't say I'm proud of it...

[f-lawe]

@ota-meshi Here we are: #631

[ota-meshi]

Thanks!