Docs: add FAQ about vue-eslint-parser

Author: mysticatea

README.md

@@ -113,6 +113,30 @@ The `--fix` option on the command line automatically fixes problems reported by
 
 <!--RULES_TABLE_END-->
 
+## :couple: FAQ
+
+### What is "Use the latest vue-eslint-parser" errors?
+
+The most rules of `eslint-plugin-vue` requires `vue-eslint-parser` to check `<template>` ASTs.
+
+Please add one of the following settings into your configuration:
+
+- `"extends": ["plugin:vue/recommended"]`
+- `"extends": ["plugin:vue/base"]`
+- `"parser": "vue-eslint-parser"` (and do `npm install -D vue-eslint-parser`)
+
+If you have `"parser": "babel-eslint"` setting or something like in your configuration, please move it into `parserOptions`.
+The `vue-eslint-parser` uses the parser which is set by `parserOptions.parser` to parse scripts.
+
+```diff
+- "parser": "babel-eslint",
+  "parserOptions": {
++     "parser": "babel-eslint",
+      "ecmaVersion": 2017,
+      "sourceType": "module"
+  }
+```
+
 ## :anchor: Semantic Versioning Policy
 
 This plugin follows [semantic versioning](http://semver.org/) and [ESLint's Semantic Versioning Policy](https://github.com/eslint/eslint#semantic-versioning-policy).

lib/utils/index.js

@@ -32,7 +32,7 @@ module.exports = {
     if (context.parserServices.registerTemplateBodyVisitor == null) {
       context.report({
         loc: { line: 1, column: 0 },
-        message: 'Use the latest vue-eslint-parser.'
+        message: 'Use the latest vue-eslint-parser. See also https://github.com/vuejs/eslint-plugin-vue#what-is-use-the-latest-vue-eslint-parser-errors'
       })
       return
     }