feat(no-empty-component-block): support auto fix (#2595)

Co-authored-by: Yosuke Ota <[email protected]>
Co-authored-by: Flo Edelmann <[email protected]>

docs/rules/index.md

@@ -232,7 +232,7 @@ For example:
 | [vue/no-deprecated-delete-set](./no-deprecated-delete-set.md) | disallow using deprecated `$delete` and `$set` (in Vue.js 3.0.0+) |  | :warning: |
 | [vue/no-deprecated-model-definition](./no-deprecated-model-definition.md) | disallow deprecated `model` definition (in Vue.js 3.0.0+) | :bulb: | :warning: |
 | [vue/no-duplicate-attr-inheritance](./no-duplicate-attr-inheritance.md) | enforce `inheritAttrs` to be set to `false` when using `v-bind="$attrs"` |  | :hammer: |
-| [vue/no-empty-component-block](./no-empty-component-block.md) | disallow the `<template>` `<script>` `<style>` block to be empty |  | :hammer: |
+| [vue/no-empty-component-block](./no-empty-component-block.md) | disallow the `<template>` `<script>` `<style>` block to be empty | :wrench: | :hammer: |
 | [vue/no-multiple-objects-in-class](./no-multiple-objects-in-class.md) | disallow to pass multiple objects into array to class |  | :hammer: |
 | [vue/no-potential-component-option-typo](./no-potential-component-option-typo.md) | disallow a potential typo in your component property | :bulb: | :hammer: |
 | [vue/no-ref-object-reactivity-loss](./no-ref-object-reactivity-loss.md) | disallow usages of ref objects that can lead to loss of reactivity |  | :warning: |

docs/rules/no-empty-component-block.md

@@ -10,14 +10,16 @@ since: v7.0.0
 
 > disallow the `<template>` `<script>` `<style>` block to be empty
 
+- :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.
+
 ## :book: Rule Details
 
 This rule disallows the `<template>` `<script>` `<style>` block to be empty.
 
 This rule also checks block what has attribute `src`.
 See [Vue Single-File Component (SFC) Spec](https://vue-loader.vuejs.org/spec.html#src-imports).
 
-<eslint-code-block :rules="{'vue/no-empty-component-block': ['error']}">
+<eslint-code-block fix :rules="{'vue/no-empty-component-block': ['error']}">
 
 ```vue
 <!-- ✓ GOOD -->

lib/rules/no-empty-component-block.js

@@ -45,7 +45,7 @@ module.exports = {
       categories: undefined,
       url: 'https://eslint.vuejs.org/rules/no-empty-component-block.html'
     },
-    fixable: null,
+    fixable: 'code',
     schema: [],
     messages: {
       unexpected: '`<{{ blockName }}>` is empty. Empty block is not allowed.'
@@ -91,6 +91,9 @@ module.exports = {
               messageId: 'unexpected',
               data: {
                 blockName: componentBlock.name
+              },
+              fix(fixer) {
+                return fixer.remove(componentBlock)
               }
             })
           }

tests/lib/rules/no-empty-component-block.js

@@ -27,6 +27,7 @@ tester.run('no-empty-component-block', rule, {
   invalid: [
     {
       code: `<template></template>`,
+      output: '',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -35,6 +36,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: `<template> </template>`,
+      output: '',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -44,6 +46,7 @@ tester.run('no-empty-component-block', rule, {
     {
       code: `<template>
 </template>`,
+      output: '',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -52,6 +55,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template />',
+      output: '',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -60,6 +64,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template src="" />',
+      output: '',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -68,6 +73,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template></template><script></script>',
+      output: '<script></script>',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -79,6 +85,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template /><script />',
+      output: '<script />',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -90,6 +97,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template src="" /><script src="" />',
+      output: '<script src="" />',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -101,6 +109,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template></template><script></script><style></style>',
+      output: '<script></script>',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -115,6 +124,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template /><script /><style />',
+      output: '<script />',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -129,6 +139,7 @@ tester.run('no-empty-component-block', rule, {
     },
     {
       code: '<template src="" /><script src="" /><style src="" />',
+      output: '<script src="" />',
       errors: [
         {
           message: '`<template>` is empty. Empty block is not allowed.'
@@ -140,6 +151,64 @@ tester.run('no-empty-component-block', rule, {
           message: '`<style>` is empty. Empty block is not allowed.'
         }
       ]
+    },
+    // auto fix with whitespace
+    {
+      code: '<template></template> <script></script> <style></style>',
+      output: '  ',
+      errors: [
+        {
+          message: '`<template>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<script>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<style>` is empty. Empty block is not allowed.'
+        }
+      ]
+    },
+    {
+      code: '<template /> <script /> <style />',
+      output: '  ',
+      errors: [
+        {
+          message: '`<template>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<script>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<style>` is empty. Empty block is not allowed.'
+        }
+      ]
+    },
+    {
+      code: '<template src="" /> <script src="" /> <style src="" />',
+      output: '  ',
+      errors: [
+        {
+          message: '`<template>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<script>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<style>` is empty. Empty block is not allowed.'
+        }
+      ]
+    },
+    {
+      code: '<template><p></p></template> <script src="" /> <style src="" />',
+      output: '<template><p></p></template>  ',
+      errors: [
+        {
+          message: '`<script>` is empty. Empty block is not allowed.'
+        },
+        {
+          message: '`<style>` is empty. Empty block is not allowed.'
+        }
+      ]
     }
   ]
 })