Add selfClosingTag option to vue/html-closing-bracket-newline

docs/rules/html-closing-bracket-newline.md

@@ -5,6 +5,7 @@ title: vue/html-closing-bracket-newline
 description: require or disallow a line break before tag's closing brackets
 since: v4.1.0
 ---
+
 # vue/html-closing-bracket-newline
 
 > require or disallow a line break before tag's closing brackets
@@ -58,19 +59,29 @@ This rule aims to warn the right angle brackets which are at the location other
 
 ```json
 {
-  "vue/html-closing-bracket-newline": ["error", {
-    "singleline": "never",
-    "multiline": "always"
-  }]
+  "vue/html-closing-bracket-newline": [
+    "error",
+    {
+      "singleline": "never",
+      "multiline": "always",
+      "selfClosingTag": {
+        "singleline": "never",
+        "multiline": "always"
+      }
+    }
+  ]
 }
 ```
 
-- `singleline` ... the configuration for single-line elements. It's a single-line element if the element does not have attributes or the last attribute is on the same line as the opening bracket.
-  - `"never"` (default) ... disallow line breaks before the closing bracket.
-  - `"always"` ... require one line break before the closing bracket.
-- `multiline` ... the configuration for multiline elements. It's a multiline element if the last attribute is not on the same line of the opening bracket.
-  - `"never"` ... disallow line breaks before the closing bracket.
-  - `"always"` (default) ... require one line break before the closing bracket.
+- `singleline` (`"never"` by default) ... the configuration for single-line elements. It's a single-line element if the element does not have attributes or the last attribute is on the same line as the opening bracket.
+- `multiline` (`"always"` by default) ... the configuration for multiline elements. It's a multiline element if the last attribute is not on the same line of the opening bracket.
+- `selfClosingTag.singleline` ... the configuration for single-line self closing elements.
+- `selfClosingTag.multiline` ... the configuration for multiline self closing elements.
+
+Every option can be set to one of the following values:
+
+- `"always"` ... require one line break before the closing bracket.
+- `"never"` ... disallow line breaks before the closing bracket.
 
 Plus, you can use [`vue/html-indent`](./html-indent.md) rule to enforce indent-level of the closing brackets.
 
@@ -95,6 +106,25 @@ Plus, you can use [`vue/html-indent`](./html-indent.md) rule to enforce indent-l
 
 </eslint-code-block>
 
+### `"selfClosingTag": { "multiline": "always"}`
+
+<eslint-code-block fix :rules="{'vue/html-closing-bracket-newline': ['error', { 'selfClosingTag': {'multiline': 'always'} }]}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <MyComponent
+      :foo="foo"
+  />
+
+  <!-- ✗ BAD -->
+  <MyComponent
+      :foo="foo" />
+</template>
+```
+
+</eslint-code-block>
+
 ## :rocket: Version
 
 This rule was introduced in eslint-plugin-vue v4.1.0

lib/rules/html-closing-bracket-newline.js

@@ -24,6 +24,45 @@ function getPhrase(lineBreaks) {
   }
 }
 
+/**
+ * @typedef LineBreakBehavior
+ * @type {('always'|'never')}
+ */
+
+/**
+ * @typedef LineType
+ * @type {('singleline'|'multiline')}
+ */
+
+/**
+ * @typedef RuleOptions
+ * @type {object}
+ * @property {LineBreakBehavior} singleline - The behavior for single line tags.
+ * @property {LineBreakBehavior} multiline - The behavior for multiline tags.
+ * @property {object} selfClosingTag
+ * @property {LineBreakBehavior} selfClosingTag.singleline - The behavior for single line self closing tags.
+ * @property {LineBreakBehavior} selfClosingTag.multiline - The behavior for multiline self closing tags.
+ */
+
+/**
+ * @param {VStartTag | VEndTag} node - The node representing a start or end tag.
+ * @param {RuleOptions} options - The options for line breaks.
+ * @param {LineType} type - The type of line break.
+ * @returns {number} - The expected line breaks.
+ */
+function getExpectedLineBreaks(node, options, type) {
+  const isSelfClosingTag = node.type === 'VStartTag' && node.selfClosing
+  if (
+    isSelfClosingTag &&
+    options.selfClosingTag &&
+    options.selfClosingTag[type]
+  ) {
+    return options.selfClosingTag[type] === 'always' ? 1 : 0
+  }
+
+  return options[type] === 'always' ? 1 : 0
+}
+
 module.exports = {
   meta: {
     type: 'layout',
@@ -39,7 +78,16 @@ module.exports = {
         type: 'object',
         properties: {
           singleline: { enum: ['always', 'never'] },
-          multiline: { enum: ['always', 'never'] }
+          multiline: { enum: ['always', 'never'] },
+          selfClosingTag: {
+            type: 'object',
+            properties: {
+              singleline: { enum: ['always', 'never'] },
+              multiline: { enum: ['always', 'never'] }
+            },
+            additionalProperties: false,
+            minProperties: 1
+          }
         },
         additionalProperties: false
       }
@@ -80,7 +128,9 @@ module.exports = {
           node.loc.start.line === prevToken.loc.end.line
             ? 'singleline'
             : 'multiline'
-        const expectedLineBreaks = options[type] === 'always' ? 1 : 0
+
+        const expectedLineBreaks = getExpectedLineBreaks(node, options, type)
+
         const actualLineBreaks =
           closingBracketToken.loc.start.line - prevToken.loc.end.line
 

tests/lib/rules/html-closing-bracket-newline.js

@@ -116,6 +116,42 @@ tester.run('html-closing-bracket-newline', rule, {
         }
       ]
     },
+    {
+      code: `
+        <template>
+          <MyComp
+            :foo="foo"
+          />
+          <MyComp :foo="foo" />
+        </template>
+      `,
+      options: [
+        {
+          selfClosingTag: {
+            singleline: 'never',
+            multiline: 'always'
+          }
+        }
+      ]
+    },
+    {
+      code: `
+        <template>
+          <MyComp :foo="foo"
+          />
+          <MyComp
+            :foo="foo" />
+        </template>
+      `,
+      options: [
+        {
+          selfClosingTag: {
+            singleline: 'always',
+            multiline: 'never'
+          }
+        }
+      ]
+    },
 
     // Ignore if no closing brackets
     `
@@ -479,6 +515,106 @@ tester.run('html-closing-bracket-newline', rule, {
           endColumn: 23
         }
       ]
+    },
+    {
+      code: `
+        <template>
+          <MyComp
+          />
+        </template>
+      `,
+      output: `
+        <template>
+          <MyComp/>
+        </template>
+      `,
+      options: [
+        {
+          selfClosingTag: {
+            singleline: 'never',
+            multiline: 'always'
+          }
+        }
+      ],
+      errors: [
+        'Expected no line breaks before closing bracket, but 1 line break found.'
+      ]
+    },
+    {
+      code: `
+        <template>
+          <MyComp
+            :foo="foo"/>
+        </template>
+      `,
+      output: `
+        <template>
+          <MyComp
+            :foo="foo"
+/>
+        </template>
+      `,
+      options: [
+        {
+          selfClosingTag: {
+            singleline: 'never',
+            multiline: 'always'
+          }
+        }
+      ],
+      errors: [
+        'Expected 1 line break before closing bracket, but no line breaks found.'
+      ]
+    },
+    {
+      code: `
+        <template>
+          <MyComp :foo="foo"/>
+        </template>
+      `,
+      output: `
+        <template>
+          <MyComp :foo="foo"
+/>
+        </template>
+      `,
+      options: [
+        {
+          selfClosingTag: {
+            singleline: 'always',
+            multiline: 'never'
+          }
+        }
+      ],
+      errors: [
+        'Expected 1 line break before closing bracket, but no line breaks found.'
+      ]
+    },
+    {
+      code: `
+        <template>
+          <MyComp
+            :foo="foo"
+          />
+        </template>
+      `,
+      output: `
+        <template>
+          <MyComp
+            :foo="foo"/>
+        </template>
+      `,
+      options: [
+        {
+          selfClosingTag: {
+            singleline: 'always',
+            multiline: 'never'
+          }
+        }
+      ],
+      errors: [
+        'Expected no line breaks before closing bracket, but 1 line break found.'
+      ]
     }
   ]
 })