feat: don't throw on console/debugger statements for vue serve (vue…

…js#5029)

1. they're useful in development
2. to be in line with the default preset

packages/@vue/cli-service-global/lib/globalConfigPlugin.js

@@ -112,6 +112,10 @@ module.exports = function createConfigPlugin (context, entry, asLib) {
                   ],
                   parserOptions: {
                     parser: 'babel-eslint'
+                  },
+                  rules: {
+                    'no-console': process.env.NODE_ENV === 'production' ? 'error' : 'off',
+                    'no-debugger': `process.env.NODE_ENV === 'production' ? 'error' : 'off'`
                   }
                 }
               }))