zoro-cli/lib/plugins/config-webpack/template/script/config/eslint.js

https://github.com/vuejs/vue-cli

module.exports = ({ api, options }) => {
  const { lintOnSave } = options
  if (lintOnSave) {
    const extensions = ['.js', '.jsx', '.ts', '.tsx', '.vue']

    // eslint-loader doesn't bust cache when eslint config changes
    // so we have to manually generate a cache identifier that takes the config
    // into account.
    const { cacheIdentifier } = api.genCacheConfig(
      'eslint-loader',
      {
        'eslint-loader': require('eslint-loader/package.json').version,
        eslint: require('eslint/package.json').version,
      },
      [
        '.eslintrc.js',
        '.eslintrc.yaml',
        '.eslintrc.yml',
        '.eslintrc.json',
        '.eslintrc',
        'package.json',
      ]
    )

    api.chainWebpack(webpackConfig => {
      webpackConfig.module
        .rule('eslint')
        .pre()
        .exclude.add(/node_modules/)
        .end()
        .test(/\.(vue|(j|t)sx?)$/)
        .use('eslint-loader')
        .loader('eslint-loader')
        .options({
          extensions,
          cache: true,
          cacheIdentifier,
          emitWarning: options.lintOnSave !== 'error',
          formatter: require('eslint/lib/formatters/codeframe'),
        })
    })
  }
}