Add vue/no-undef-properties rule

Author: ota-meshi

docs/rules/README.md

@@ -312,6 +312,7 @@ For example:
 | [vue/no-restricted-v-bind](./no-restricted-v-bind.md) | disallow specific argument in `v-bind` |  |
 | [vue/no-static-inline-styles](./no-static-inline-styles.md) | disallow static inline `style` attributes |  |
 | [vue/no-template-target-blank](./no-template-target-blank.md) | disallow target="_blank" attribute without rel="noopener noreferrer" |  |
+| [vue/no-undef-properties](./no-undef-properties.md) | disallow undefined properties |  |
 | [vue/no-unregistered-components](./no-unregistered-components.md) | disallow using components that are not registered inside templates |  |
 | [vue/no-unsupported-features](./no-unsupported-features.md) | disallow unsupported Vue.js syntax on the specified version | :wrench: |
 | [vue/no-unused-properties](./no-unused-properties.md) | disallow unused properties |  |

docs/rules/no-undef-properties.md

@@ -0,0 +1,90 @@
+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/no-undef-properties
+description: disallow undefined properties
+---
+# vue/no-undef-properties
+
+> disallow undefined properties
+
+- :exclamation: <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+
+## :book: Rule Details
+
+This rule warns of using undefined properties.  
+This rule can help you locate potential errors resulting from misspellings property names, and implicitly added properties.
+
+::: warning Note
+This rule cannot detect properties defined in other files or components.
+:::
+
+<eslint-code-block :rules="{'vue/no-undef-properties': ['error']}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div>{{ name }}: {{ count }}</div>
+  <!-- ✗ BAD -->
+  <div>{{ label }}: {{ cnt }}</div>
+</template>
+<script>
+  export default {
+    props: ['name'],
+    data () {
+      return {
+        count: 0
+      }
+    },
+    methods: {
+      click() {
+        /* ✓ GOOD */
+        this.count++
+
+        /* ✗ BAD */
+        this.cnt++
+      }
+    }
+  }
+</script>
+```
+
+</eslint-code-block>
+
+## :wrench: Options
+
+```json
+{
+  "vue/no-undef-properties": ["error", {
+    "ignores": ["/^\\$/"]
+  }]
+}
+```
+
+- `ignores` (`string[]`) ... An array of property names or patterns that have already been defined property, or property to ignore from the check. Default is `["/^\\$/"]`.
+
+### `"ignores": ["/^\\$/"]` (default)
+
+<eslint-code-block :rules="{'vue/no-undef-properties': ['error', {ignores: ['/^\\$/']}]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <div>{{ $t('foo') }}</div>
+</template>
+<script>
+  export default {
+    mounted() {
+      /* ✓ GOOD */
+      const hash = this.$route.hash
+    }
+  }
+</script>
+```
+
+</eslint-code-block>
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/no-undef-properties.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/no-undef-properties.js)

lib/index.js

@@ -112,6 +112,7 @@ module.exports = {
     'no-template-shadow': require('./rules/no-template-shadow'),
     'no-template-target-blank': require('./rules/no-template-target-blank'),
     'no-textarea-mustache': require('./rules/no-textarea-mustache'),
+    'no-undef-properties': require('./rules/no-undef-properties'),
     'no-unregistered-components': require('./rules/no-unregistered-components'),
     'no-unsupported-features': require('./rules/no-unsupported-features'),
     'no-unused-components': require('./rules/no-unused-components'),