Add new vue/enforce-style-attribute rule

docs/rules/enforce-style-attribute.md

@@ -0,0 +1,86 @@
+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/enforce-style-attribute
+description: enforce or forbid the use of the `scoped` and `module` attributes in SFC top level style tags
+---
+
+# vue/enforce-style-attribute
+
+> enforce or forbid the use of the `scoped` and `module` attributes 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>
+
+## :book: Rule Details
+
+This rule allows you to explicitly allow the use of the `scoped` and `module` attributes on your top level style tags.
+
+### `"scoped"`
+
+<eslint-code-block :rules="{'vue/enforce-style-attribute': ['error', { allow: ['scoped'] }]}">
+
+```vue
+<!-- ✓ GOOD -->
+<style scoped></style>
+<style lang="scss" src="../path/to/style.scss" scoped></style>
+
+<!-- ✗ BAD -->
+<style module></style>
+
+<!-- ✗ BAD -->
+<style></style>
+```
+
+</eslint-code-block>
+
+### `"module"`
+
+<eslint-code-block :rules="{'vue/enforce-style-attribute': ['error', { allow: ['module'] }]}">
+
+```vue
+<!-- ✓ GOOD -->
+<style module></style>
+
+<!-- ✗ BAD -->
+<style scoped></style>
+
+<!-- ✗ BAD -->
+<style></style>
+```
+
+</eslint-code-block>
+
+### `"plain"`
+
+<eslint-code-block :rules="{'vue/enforce-style-attribute': ['error', { allow: ['plain']}]}">
+
+```vue
+<!-- ✓ GOOD -->
+<style></style>
+
+<!-- ✗ BAD -->
+<style scoped></style>
+
+<!-- ✗ BAD -->
+<style module></style>
+```
+
+</eslint-code-block>
+
+## :wrench: Options
+
+```json
+{
+  "vue/enforce-style-attribute": [
+    "error",
+    { "allow": ["scoped", "module", "plain"] }
+  ]
+}
+```
+
+- `"allow"` (`["scoped" | "module" | "plain"]`) Array of attributes to allow on a top level style tag. The option `plain` is used to allow style tags that have neither the `scoped` nor `module` attributes. Default: `["scoped"]`
+
+## :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)

docs/rules/index.md

@@ -215,6 +215,7 @@ For example:
 | [vue/define-emits-declaration](./define-emits-declaration.md) | enforce declaration style of `defineEmits` |  | :hammer: |
 | [vue/define-macros-order](./define-macros-order.md) | enforce order of `defineEmits` and `defineProps` compiler macros | :wrench: | :lipstick: |
 | [vue/define-props-declaration](./define-props-declaration.md) | enforce declaration style of `defineProps` |  | :hammer: |
+| [vue/enforce-style-attribute](./enforce-style-attribute.md) | enforce or forbid the use of the `scoped` and `module` attributes in SFC top level style tags |  | :hammer: |
 | [vue/html-button-has-type](./html-button-has-type.md) | disallow usage of button without an explicit type attribute |  | :hammer: |
 | [vue/html-comment-content-newline](./html-comment-content-newline.md) | enforce unified line brake in HTML comments | :wrench: | :lipstick: |
 | [vue/html-comment-content-spacing](./html-comment-content-spacing.md) | enforce unified spacing in HTML comments | :wrench: | :lipstick: |

lib/index.js

@@ -35,6 +35,7 @@
     'define-props-declaration': require('./rules/define-props-declaration'),
     'dot-location': require('./rules/dot-location'),
     'dot-notation': require('./rules/dot-notation'),
+    'enforce-style-attribute': require('./rules/enforce-style-attribute'),
     eqeqeq: require('./rules/eqeqeq'),
     'first-attribute-linebreak': require('./rules/first-attribute-linebreak'),
     'func-call-spacing': require('./rules/func-call-spacing'),
@@ -261,7 +262,7 @@
     '.vue': require('./processor')
   },
   environments: {
     // TODO Remove in the next major version
     /** @deprecated */
     'setup-compiler-macros': {
       globals: {

lib/rules/enforce-style-attribute.js

@@ -0,0 +1,153 @@
+/**
+ * @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'
+  )
+}
+
+/**
+ * check if a tag doesn't have either the `scoped` nor `module` attribute
+ * @param {VElement} componentBlock
+ */
+function isPlain(componentBlock) {
+  return !isScoped(componentBlock) && !isModule(componentBlock)
+}
+
+function getUserDefinedAllowedAttrs(context) {
+  if (context.options[0] && context.options[0].allow) {
+    return context.options[0].allow
+  }
+  return []
+}
+
+const defaultAllowedAttrs = ['scoped']
+
+module.exports = {
+  meta: {
+    type: 'suggestion',
+    docs: {
+      description:
+        'enforce or forbid the use of the `scoped` and `module` attributes in SFC top level style tags',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/enforce-style-attribute.html'
+    },
+    fixable: null,
+    schema: [
+      {
+        type: 'object',
+        properties: {
+          allow: {
+            type: 'array',
+            minItems: 1,
+            uniqueItems: true,
+            items: {
+              type: 'string',
+              enum: ['plain', 'scoped', 'module']
+            }
+          }
+        },
+        additionalProperties: false
+      }
+    ],
+    messages: {
+      notAllowedScoped:
+        'The scoped attribute is not allowed. Allowed: {{ allowedAttrsString }}.',
+      notAllowedModule:
+        'The module attribute is not allowed. Allowed: {{ allowedAttrsString }}.',
+      notAllowedPlain:
+        'Plain <style> tags are not allowed. Allowed: {{ allowedAttrsString }}.'
+    }
+  },
+
+  /** @param {RuleContext} context */
+  create(context) {
+    const sourceCode = context.getSourceCode()
+    if (!sourceCode.parserServices.getDocumentFragment) {
+      return {}
+    }
+    const documentFragment = sourceCode.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 userDefinedAllowedAttrs = getUserDefinedAllowedAttrs(context)
+    const allowedAttrs =
+      userDefinedAllowedAttrs.length > 0
+        ? userDefinedAllowedAttrs
+        : defaultAllowedAttrs
+
+    const allowsPlain = allowedAttrs.includes('plain')
+    const allowsScoped = allowedAttrs.includes('scoped')
+    const allowsModule = allowedAttrs.includes('module')
+    const allowedAttrsString = [...allowedAttrs].sort().join(', ')
+
+    return {
+      Program() {
+        for (const styleTag of topLevelStyleTags) {
+          if (!allowsPlain && isPlain(styleTag)) {
+            context.report({
+              node: styleTag,
+              messageId: 'notAllowedPlain',
+              data: {
+                allowedAttrsString
+              }
+            })
+            return
+          }
+
+          if (!allowsScoped && isScoped(styleTag)) {
+            context.report({
+              node: styleTag,
+              messageId: 'notAllowedScoped',
+              data: {
+                allowedAttrsString
+              }
+            })
+            return
+          }
+
+          if (!allowsModule && isModule(styleTag)) {
+            context.report({
+              node: styleTag,
+              messageId: 'notAllowedModule',
+              data: {
+                allowedAttrsString
+              }
+            })
+            return
+          }
+        }
+      }
+    }
+  }
+}