⭐️New: Add vue/keyword-spacing rule

docs/rules/README.md

@@ -148,6 +148,7 @@ For example:
 | [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: |
+| [vue/keyword-spacing](./keyword-spacing.md) | enforce consistent spacing before and after keywords | :wrench: |
 | [vue/match-component-file-name](./match-component-file-name.md) | require component name property to match its file name |  |
 | [vue/no-restricted-syntax](./no-restricted-syntax.md) | disallow specified syntax |  |
 | [vue/object-curly-spacing](./object-curly-spacing.md) | enforce consistent spacing inside braces | :wrench: |

docs/rules/keyword-spacing.md

@@ -0,0 +1,23 @@
+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/keyword-spacing
+description: enforce consistent spacing before and after keywords
+---
+# vue/keyword-spacing
+> enforce consistent spacing before and after keywords
+
+- :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 [keyword-spacing] rule but it applies to the expressions in `<template>`.
+
+## :books: Further reading
+
+- [keyword-spacing]
+
+[keyword-spacing]: https://eslint.org/docs/rules/keyword-spacing
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/keyword-spacing.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/keyword-spacing.js)

lib/configs/no-layout-rules.js

@@ -16,6 +16,7 @@ module.exports = {
     'vue/html-quotes': 'off',
     'vue/html-self-closing': 'off',
     'vue/key-spacing': 'off',
+    'vue/keyword-spacing': 'off',
     'vue/max-attributes-per-line': 'off',
     'vue/multiline-html-element-content-newline': 'off',
     'vue/mustache-interpolation-spacing': 'off',

lib/index.js

@@ -26,6 +26,7 @@ module.exports = {
     'html-self-closing': require('./rules/html-self-closing'),
     'jsx-uses-vars': require('./rules/jsx-uses-vars'),
     'key-spacing': require('./rules/key-spacing'),
+    'keyword-spacing': require('./rules/keyword-spacing'),
     'match-component-file-name': require('./rules/match-component-file-name'),
     'max-attributes-per-line': require('./rules/max-attributes-per-line'),
     'multiline-html-element-content-newline': require('./rules/multiline-html-element-content-newline'),

lib/rules/keyword-spacing.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/keyword-spacing'))

tests/lib/rules/keyword-spacing.js

@@ -0,0 +1,142 @@
+/**
+ * @author Yosuke Ota
+ */
+'use strict'
+
+const RuleTester = require('eslint').RuleTester
+const rule = require('../../../lib/rules/keyword-spacing')
+
+const tester = new RuleTester({
+  parser: 'vue-eslint-parser',
+  parserOptions: { ecmaVersion: 2015 }
+})
+
+tester.run('keyword-spacing', rule, {
+  valid: [
+    `<template>
+      <div @event="
+        if (foo) {
+          //...
+        } else if (bar) {
+          //...
+        } else {
+          //...
+        }
+      " />
+    </template>`,
+    {
+      code:
+      `<template>
+        <div @event="
+          if(foo) {
+            //...
+          }else if(bar) {
+            //...
+          }else{
+            //...
+          }
+        " />
+      </template>`,
+      options: [{ before: false, after: false }]
+    }
+  ],
+  invalid: [
+    {
+      code:
+      `<template>
+        <div @event="
+          if(foo) {
+            //...
+          }else if(bar) {
+            //...
+          }else{
+            //...
+          }
+        " />
+      </template>`,
+      output:
+      `<template>
+        <div @event="
+          if (foo) {
+            //...
+          } else if (bar) {
+            //...
+          } else {
+            //...
+          }
+        " />
+      </template>`,
+      errors: [
+        {
+          message: 'Expected space(s) after "if".',
+          line: 3
+        },
+        {
+          message: 'Expected space(s) before "else".',
+          line: 5
+        },
+        {
+          message: 'Expected space(s) after "if".',
+          line: 5
+        },
+        {
+          message: 'Expected space(s) before "else".',
+          line: 7
+        },
+        {
+          message: 'Expected space(s) after "else".',
+          line: 7
+        }
+      ]
+    },
+    {
+      code:
+      `<template>
+        <div @event="
+          if (foo) {
+            //...
+          } else if (bar) {
+            //...
+          } else {
+            //...
+          }
+        " />
+      </template>`,
+      options: [{ before: false, after: false }],
+      output:
+      `<template>
+        <div @event="
+          if(foo) {
+            //...
+          }else if(bar) {
+            //...
+          }else{
+            //...
+          }
+        " />
+      </template>`,
+      errors: [
+        {
+          message: 'Unexpected space(s) after "if".',
+          line: 3
+        },
+        {
+          message: 'Unexpected space(s) before "else".',
+          line: 5
+        },
+        {
+          message: 'Unexpected space(s) after "if".',
+          line: 5
+        },
+        {
+          message: 'Unexpected space(s) before "else".',
+          line: 7
+        },
+        {
+          message: 'Unexpected space(s) after "else".',
+          line: 7
+        }
+      ]
+    }
+  ]
+})