Add new vue/enforce-style-attribute rule

docs/rules/enforce-style-attribute.md

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+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/enforce-style-attribute
+description: enforce either the `scoped` or `module`  attribute in SFC top level style tags
+---
+
+# vue/enforce-style-attribute
+
+> enfore either the `scoped` or `module` attribute in SFC top level style tags
+
+- :exclamation: <badge text="This rule has not been released yet." vertical="middle" type="error"> **_This rule has not been released yet._** </badge>
+
+## :wrench: Options
+
+```json
+{
+  "vue/attribute-hyphenation": ["error", "either" | "scoped" |  "module"]
+}
+```
+
+## :book: Rule Details
+
+This rule warns you about top level style tags that are missing either the `scoped` or `module` attribute.
+
+- `"either"` (default) ... Warn if a style tag doesn't have neither `scoped` nor `module` attributes.
+- `"scoped"` ... Warn if a style tag doesn't have the `scoped` attribute.
+- `"module"` ... Warn if a style tag doesn't have the `module` attribute.
+
+### `"either"`
+
+<eslint-code-block :rules="{'vue/enforce-style-attribute': ['error', 'either']}">
+
+```vue
+<!-- ✓ GOOD -->
+<style scoped></style>
+<style lang="scss" src="../path/to/style.scss" scoped></style>
+
+<!-- ✓ GOOD -->
+<style module></style>
+
+<!-- ✗ BAD -->
+<style></style>
+```
+
+</eslint-code-block>
+
+### `"scoped"`
+
+<eslint-code-block :rules="{'vue/enforce-style-attribute': ['error', 'scoped']}">
+
+```vue
+<!-- ✓ GOOD -->
+<style scoped></style>
+<style lang="scss" src="../path/to/style.scss" scoped></style>
+
+<!-- ✗ BAD -->
+<style></style>
+<style module></style>
+```
+
+</eslint-code-block>
+
+### `"module"`
+
+<eslint-code-block :rules="{'vue/enforce-style-attribute': ['error', 'module']}">
+
+```vue
+<!-- ✓ GOOD -->
+<style module></style>
+
+<!-- ✗ BAD -->
+<style></style>
+<style scoped></style>
+<style lang="scss" src="../path/to/style.scss" scoped></style>
+```
+
+</eslint-code-block>
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/enforce-style-attribute.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/enforce-style-attribute.js)

lib/rules/enforce-style-attribute.js

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+/**
+ * @author Mussin Benarbia
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const { isVElement } = require('../utils')
+
+/**
+ * check whether a tag has the `scoped` attribute
+ * @param {VElement} componentBlock
+ */
+function isScoped(componentBlock) {
+  return componentBlock.startTag.attributes.some(
+    (attribute) => !attribute.directive && attribute.key.name === 'scoped'
+  )
+}
+
+/**
+ * check whether a tag has the `module` attribute
+ * @param {VElement} componentBlock
+ */
+function isModule(componentBlock) {
+  return componentBlock.startTag.attributes.some(
+    (attribute) => !attribute.directive && attribute.key.name === 'module'
+  )
+}
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description:
+        'enforce either the `scoped` or `module`  attribute in SFC top level style tags',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/enforce-style-attribute.html'
+    },
+    fixable: 'code',
+    schema: [{ enum: ['scoped', 'module', 'either'] }],
+    messages: {
+      needsScoped: 'The <style> tag should have the scoped attribute.',
+      needsModule: 'The <style> tag should have the module attribute.',
+      needsEither:
+        'The <style> tag should have either the scoped or module attribute.'
+    }
+  },
+
+  /** @param {RuleContext} context */
+  create(context) {
+    if (!context.parserServices.getDocumentFragment) {
+      return {}
+    }
+    const documentFragment = context.parserServices.getDocumentFragment()
+    if (!documentFragment) {
+      return {}
+    }
+
+    const topLevelElements = documentFragment.children.filter(isVElement)
+    const topLevelStyleTags = topLevelElements.filter(
+      (element) => element.rawName === 'style'
+    )
+
+    if (topLevelStyleTags.length === 0) {
+      return {}
+    }
+
+    const mode = context.options[0] || 'either'
+    const needsScoped = mode === 'scoped'
+    const needsModule = mode === 'module'
+    const needsEither = mode === 'either'
+
+    return {
+      Program() {
+        for (const styleTag of topLevelStyleTags) {
+          if (needsScoped && !isScoped(styleTag)) {
+            context.report({
+              node: styleTag,
+              messageId: 'needsScoped'
+            })
+            return
+          }
+
+          if (needsModule && !isModule(styleTag)) {
+            context.report({
+              node: styleTag,
+              messageId: 'needsModule'
+            })
+            return
+          }
+
+          if (needsEither && !isScoped(styleTag) && !isModule(styleTag)) {
+            context.report({
+              node: styleTag,
+              messageId: 'needsEither'
+            })
+            return
+          }
+        }
+      }
+    }
+  }
+}

tests/lib/rules/enforce-style-attribute.js

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+/**
+ * @author Mussin Benarbia
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const RuleTester = require('eslint').RuleTester
+const rule = require('../../../lib/rules/enforce-style-attribute')
+
+const tester = new RuleTester({
+  parser: require.resolve('vue-eslint-parser'),
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: 'module'
+  }
+})
+
+tester.run('enforce-style-attribute', rule, {
+  valid: [
+    // With default options
+    {
+      filename: 'test.vue',
+      code: '<template></template><script></script><style scoped></style>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template></template><script></script><style module></style>'
+    },
+    {
+      filename: 'test.vue',
+      code: '<template></template><script></script><style lang=scss" "src="../path/to/style.scss" scoped></style>'
+    },
+    // With scoped option
+    {
+      filename: 'test.vue',
+      code: '<template></template><script></script><style scoped></style>',
+      options: ['scoped']
+    },
+    {
+      filename: 'test.vue',
+      code: '<template></template><script></script><style lang=scss" "src="../path/to/style.scss" scoped></style>',
+      options: ['scoped']
+    },
+    // With module option
+    {
+      filename: 'test.vue',
+      code: '<template></template><script></script><style module></style>',
+      options: ['module']
+    }
+  ],
+  invalid: [
+    // With default options
+    {
+      code: `<template></template><script></script><style></style>`,
+      errors: [
+        {
+          message:
+            'The <style> tag should have either the scoped or module attribute.'
+        }
+      ]
+    },
+    // With scoped option
+    {
+      code: `<template></template><script></script><style></style>`,
+      errors: [
+        {
+          message: 'The <style> tag should have the scoped attribute.'
+        }
+      ],
+      options: ['scoped']
+    },
+    {
+      code: `<template></template><script></script><style module></style>`,
+      errors: [
+        {
+          message: 'The <style> tag should have the scoped attribute.'
+        }
+      ],
+      options: ['scoped']
+    },
+    // With module option
+    {
+      code: `<template></template><script></script><style></style>`,
+      errors: [
+        {
+          message: 'The <style> tag should have the module attribute.'
+        }
+      ],
+      options: ['module']
+    },
+    {
+      code: `<template></template><script></script><style scoped></style>`,
+      errors: [
+        {
+          message: 'The <style> tag should have the module attribute.'
+        }
+      ],
+      options: ['module']
+    }
+  ]
+})