update doc

Author: ota-meshi

docs/user-guide/README.md

@@ -356,6 +356,26 @@ module.exports = {
 }
 ```
 
+#### Compiler macros such as `defineProps` and `defineEmits` are warned by `no-undef` rule
+
+You need to define [global variables](https://eslint.org/docs/user-guide/configuring/language-options#using-configuration-files-1) in your ESLint configuration file.  
+If you don't want to define global variables, use `import { defineProps, defineEmits } from 'vue'`.
+
+Example **.eslintrc.js**:
+
+```js
+module.exports = {
+  globals: {
+    defineProps: "readonly",
+    defineEmits: "readonly",
+    defineExpose: "readonly",
+    withDefaults: "readonly"
+  }
+}
+```
+
+See also [ESLint - Specifying Globals > Using configuration files](https://eslint.org/docs/user-guide/configuring/language-options#using-configuration-files-1).
+
 #### Parsing error with Top Level `await`
 
 ##### Using ESLint <= v7.x