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feat(format): add ESLint formatter support #77

Description

@amondnet

Summary

Add ESLint as a formatter option with --fix support.

Details

ESLint supports auto-fixing code style issues via --fix flag. Should detect both:

Flat config (ESLint v9+):

  • eslint.config.js
  • eslint.config.mjs
  • eslint.config.cjs

Legacy config:

  • .eslintrc.js
  • .eslintrc.cjs
  • .eslintrc.json
  • .eslintrc.yml
  • .eslintrc.yaml

Implementation

export const eslint: Info = {
  name: 'eslint',
  command: ['eslint', '--fix', '$FILE'],
  extensions: ['.js', '.jsx', '.mjs', '.cjs', '.ts', '.tsx', '.mts', '.cts'],
  async enabled(filePath: string, projectDir: string) {
    const startDir = path.dirname(filePath)
    const flatConfigs = ['eslint.config.js', 'eslint.config.mjs', 'eslint.config.cjs']
    const legacyConfigs = ['.eslintrc.js', '.eslintrc.cjs', '.eslintrc.json', '.eslintrc.yml', '.eslintrc.yaml']
    
    for (const config of [...flatConfigs, ...legacyConfigs]) {
      const found = await findUp(config, startDir, projectDir)
      if (found.length > 0) return true
    }
    return false
  },
}

Notes


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