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app_vue/node_modules/@vue/cli-plugin-eslint/index.js

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+const path = require('path')
+const eslintWebpackPlugin = require('eslint-webpack-plugin')
+
+/** @type {import('@vue/cli-service').ServicePlugin} */
+module.exports = (api, options) => {
+  if (options.lintOnSave) {
+    const extensions = require('./eslintOptions').extensions(api)
+    // Use loadModule to allow users to customize their ESLint dependency version.
+    const { resolveModule, loadModule } = require('@vue/cli-shared-utils')
+    const cwd = api.getCwd()
+
+    const eslintPkg =
+      loadModule('eslint/package.json', cwd, true) ||
+      loadModule('eslint/package.json', __dirname, true)
+
+    // ESLint doesn't clear the cache when you upgrade ESLint plugins (ESlint do consider config changes)
+    // so we have to manually generate a cache identifier that takes lock file into account.
+    const { cacheIdentifier, cacheDirectory } = api.genCacheConfig(
+      'eslint',
+      {
+        eslint: eslintPkg.version
+      },
+      ['package.json']
+    )
+
+    api.chainWebpack(webpackConfig => {
+      const { lintOnSave } = options
+      const treatAllAsWarnings = lintOnSave === true || lintOnSave === 'warning'
+      const treatAllAsErrors = lintOnSave === 'error'
+
+      const failOnWarning = treatAllAsErrors
+      const failOnError = !treatAllAsWarnings
+
+      /** @type {import('eslint-webpack-plugin').Options & import('eslint').ESLint.Options} */
+      const eslintWebpackPluginOptions = {
+        // common to both plugin and ESlint
+        extensions,
+        // ESlint options
+        cwd,
+        cache: true,
+        cacheLocation: path.format({
+          dir: cacheDirectory,
+          name: process.env.VUE_CLI_TEST
+            ? 'cache'
+            : cacheIdentifier,
+          ext: '.json'
+        }),
+        // plugin options
+        context: cwd,
+
+        failOnWarning,
+        failOnError,
+
+        eslintPath: path.dirname(
+          resolveModule('eslint/package.json', cwd) ||
+            resolveModule('eslint/package.json', __dirname)
+        ),
+        formatter: 'stylish'
+      }
+      webpackConfig.plugin('eslint').use(eslintWebpackPlugin, [eslintWebpackPluginOptions])
+    })
+  }
+
+  api.registerCommand(
+    'lint',
+    {
+      description: 'lint and fix source files',
+      usage: 'vue-cli-service lint [options] [...files]',
+      options: {
+        '--format [formatter]': 'specify formatter (default: stylish)',
+        '--no-fix': 'do not fix errors or warnings',
+        '--no-fix-warnings': 'fix errors, but do not fix warnings',
+        '--max-errors [limit]':
+          'specify number of errors to make build failed (default: 0)',
+        '--max-warnings [limit]':
+          'specify number of warnings to make build failed (default: Infinity)',
+        '--output-file [file_path]':
+          'specify file to write report to'
+      },
+      details:
+        'For more options, see https://eslint.org/docs/user-guide/command-line-interface#options'
+    },
+    async args => {
+      await require('./lint')(args, api)
+    }
+  )
+}