Change category of vue/require-explicit-emits rule to vue3-strongly-recommended. (#1251)

This is also recommended in the official guide.
https://v3.vuejs.org/guide/component-custom-events.html#defining-custom-events

Author: ota-meshi

docs/rules/README.md

@@ -129,6 +129,7 @@ Enforce all the rules in this category, as well as all higher priority rules, wi
 | [vue/one-component-per-file](./one-component-per-file.md) | enforce that each component should be in its own file |  |
 | [vue/prop-name-casing](./prop-name-casing.md) | enforce specific casing for the Prop name in Vue components |  |
 | [vue/require-default-prop](./require-default-prop.md) | require default value for props |  |
+| [vue/require-explicit-emits](./require-explicit-emits.md) | require `emits` option with name triggered by `$emit()` |  |
 | [vue/require-prop-types](./require-prop-types.md) | require type definitions in props |  |
 | [vue/singleline-html-element-content-newline](./singleline-html-element-content-newline.md) | require a line break before and after the contents of a singleline element | :wrench: |
 | [vue/v-bind-style](./v-bind-style.md) | enforce `v-bind` directive style | :wrench: |
@@ -306,7 +307,6 @@ For example:
 | [vue/no-useless-v-bind](./no-useless-v-bind.md) | disallow unnecessary `v-bind` directives | :wrench: |
 | [vue/padding-line-between-blocks](./padding-line-between-blocks.md) | require or disallow padding lines between blocks | :wrench: |
 | [vue/require-direct-export](./require-direct-export.md) | require the component to be directly exported |  |
-| [vue/require-explicit-emits](./require-explicit-emits.md) | require `emits` option with name triggered by `$emit()` |  |
 | [vue/require-name-property](./require-name-property.md) | require a name property in Vue components |  |
 | [vue/script-indent](./script-indent.md) | enforce consistent indentation in `<script>` | :wrench: |
 | [vue/sort-keys](./sort-keys.md) | enforce sort-keys in a manner that is compatible with order-in-components |  |

docs/rules/require-explicit-emits.md

@@ -7,6 +7,8 @@ description: require `emits` option with name triggered by `$emit()`
 # vue/require-explicit-emits
 > require `emits` option with name triggered by `$emit()`
 
+- :gear: This rule is included in `"plugin:vue/vue3-strongly-recommended"` and `"plugin:vue/vue3-recommended"`.
+
 ## :book: Rule Details
 
 This rule reports event triggers not declared with the `emits` option. (The `emits` option is a new in Vue.js 3.0.0+)

lib/configs/vue3-strongly-recommended.js

@@ -23,6 +23,7 @@ module.exports = {
     'vue/one-component-per-file': 'warn',
     'vue/prop-name-casing': 'warn',
     'vue/require-default-prop': 'warn',
+    'vue/require-explicit-emits': 'warn',
     'vue/require-prop-types': 'warn',
     'vue/singleline-html-element-content-newline': 'warn',
     'vue/v-bind-style': 'warn',

lib/rules/require-explicit-emits.js

@@ -85,7 +85,7 @@ module.exports = {
     type: 'suggestion',
     docs: {
       description: 'require `emits` option with name triggered by `$emit()`',
-      categories: undefined,
+      categories: ['vue3-strongly-recommended'],
       url: 'https://eslint.vuejs.org/rules/require-explicit-emits.html'
     },
     fixable: null,