feat: update to ESLint v5

closes #2322
closes #2704

Author: haoqunjiang

package.json

@@ -76,5 +76,8 @@
     "vue": "2.5.17",
     "vue-template-compiler": "2.5.17",
     "vue-server-renderer": "2.5.17"
+  },
+  "dependencies": {
+    "babel-eslint": "^10.0.1"
   }
 }

packages/@vue/cli-plugin-eslint/generator.js

@@ -10,7 +10,14 @@ module.exports = (api, { config, lintOn = [] }, _, invoking) => {
       lint: 'vue-cli-service lint'
     },
     eslintConfig,
-    devDependencies: {}
+    // TODO:
+    // Move these dependencies to package.json in v4.
+    // Now in v3 we have to add redundant eslint related dependencies
+    // in order to keep compatibility with v3.0.x users who defaults to ESlint v4.
+    devDependencies: {
+      'eslint': '^5.8.0',
+      'eslint-plugin-vue': '^5.0.0-0'
+    }
   }
 
   if (config === 'airbnb') {

packages/@vue/cli-plugin-eslint/index.js

@@ -3,6 +3,7 @@ const path = require('path')
 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 { loadModule } = require('@vue/cli-shared-utils')
     const cwd = api.getCwd()
     const eslintPkg = loadModule('eslint/package.json', cwd, true)

packages/@vue/cli-service-global/package.json

@@ -26,7 +26,8 @@
     "@vue/cli-plugin-eslint": "^3.0.5",
     "@vue/cli-service": "^3.0.5",
     "chalk": "^2.4.1",
-    "eslint-plugin-vue": "^4.7.1",
+    "eslint": "^5.8.0",
+    "eslint-plugin-vue": "^5.0.0-0",
     "resolve": "^1.8.1",
     "vue": "^2.5.17",
     "vue-template-compiler": "^2.5.17"