⭐️New: Add vue/brace-style rule (#771)

Author: ota-meshi

docs/rules/README.md

@@ -142,6 +142,7 @@ For example:
 | [vue/array-bracket-spacing](./array-bracket-spacing.md) | enforce consistent spacing inside array brackets | :wrench: |
 | [vue/arrow-spacing](./arrow-spacing.md) | enforce consistent spacing before and after the arrow in arrow functions | :wrench: |
 | [vue/block-spacing](./block-spacing.md) | disallow or enforce spaces inside of blocks after opening block and before closing block | :wrench: |
+| [vue/brace-style](./brace-style.md) | enforce consistent brace style for blocks | :wrench: |
 | [vue/component-name-in-template-casing](./component-name-in-template-casing.md) | enforce specific casing for the component naming style in template | :wrench: |
 | [vue/eqeqeq](./eqeqeq.md) | require the use of `===` and `!==` | :wrench: |
 | [vue/key-spacing](./key-spacing.md) | enforce consistent spacing between keys and values in object literal properties | :wrench: |

docs/rules/brace-style.md

@@ -0,0 +1,23 @@
+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/brace-style
+description: enforce consistent brace style for blocks
+---
+# vue/brace-style
+> enforce consistent brace style for blocks
+
+- :wrench: The `--fix` option on the [command line](https://eslint.org/docs/user-guide/command-line-interface#fixing-problems) can automatically fix some of the problems reported by this rule.
+
+This rule is the same rule as core [brace-style] rule but it applies to the expressions in `<template>`.
+
+## :books: Further reading
+
+- [brace-style]
+
+[brace-style]: https://eslint.org/docs/rules/brace-style
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/brace-style.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/brace-style.js)

lib/configs/no-layout-rules.js

@@ -8,6 +8,7 @@ module.exports = {
     'vue/array-bracket-spacing': 'off',
     'vue/arrow-spacing': 'off',
     'vue/block-spacing': 'off',
+    'vue/brace-style': 'off',
     'vue/html-closing-bracket-newline': 'off',
     'vue/html-closing-bracket-spacing': 'off',
     'vue/html-indent': 'off',

lib/index.js

@@ -12,6 +12,7 @@ module.exports = {
     'attribute-hyphenation': require('./rules/attribute-hyphenation'),
     'attributes-order': require('./rules/attributes-order'),
     'block-spacing': require('./rules/block-spacing'),
+    'brace-style': require('./rules/brace-style'),
     'comment-directive': require('./rules/comment-directive'),
     'component-name-in-template-casing': require('./rules/component-name-in-template-casing'),
     'eqeqeq': require('./rules/eqeqeq'),

lib/rules/brace-style.js

@@ -0,0 +1,9 @@
+/**
+ * @author Yosuke Ota
+ */
+'use strict'
+
+const { wrapCoreRule } = require('../utils')
+
+// eslint-disable-next-line
+module.exports = wrapCoreRule(require('eslint/lib/rules/brace-style'))

tests/lib/rules/brace-style.js

@@ -0,0 +1,69 @@
+/**
+ * @author Yosuke Ota
+ */
+'use strict'
+
+const RuleTester = require('eslint').RuleTester
+const rule = require('../../../lib/rules/brace-style')
+
+const tester = new RuleTester({
+  parser: 'vue-eslint-parser',
+  parserOptions: { ecmaVersion: 2015 }
+})
+
+tester.run('brace-style', rule, {
+  valid: [
+    `<template><div :attr="function foo() {
+      return true;
+    }" /></template>`,
+    {
+      code: `<template><div :attr="function foo() { return true; }" /></template>`,
+      options: ['1tbs', { 'allowSingleLine': true }]
+    }
+  ],
+  invalid: [
+    {
+      code: `
+        <template>
+          <div :attr="function foo()
+          {
+            return true;
+          }" />
+        </template>`,
+      output: `
+        <template>
+          <div :attr="function foo() {
+            return true;
+          }" />
+        </template>`,
+      errors: [
+        {
+          message: 'Opening curly brace does not appear on the same line as controlling statement.',
+          line: 4
+        }
+      ]
+    },
+    {
+      code: `
+        <template>
+          <div :attr="function foo() { return true; }" />
+        </template>`,
+      output: `
+        <template>
+          <div :attr="function foo() {
+ return true;\u{20}
+}" />
+        </template>`,
+      errors: [
+        {
+          message: 'Statement inside of curly braces should be on next line.',
+          line: 3
+        },
+        {
+          message: 'Closing curly brace should be on the same line as opening curly brace or on the line after the previous block.',
+          line: 3
+        }
+      ]
+    }
+  ]
+})