chore(consistent-selector-style): added rule scaffolding

Author: marekdedic

README.md

@@ -439,6 +439,7 @@ These rules relate to style guidelines, and are therefore quite subjective:
 
 | Rule ID | Description |    |
 |:--------|:------------|:---|
+| [svelte/consistent-selector-style](https://sveltejs.github.io/eslint-plugin-svelte/rules/consistent-selector-style/) | enforce a consistent style for CSS selectors |  |
 | [svelte/derived-has-same-inputs-outputs](https://sveltejs.github.io/eslint-plugin-svelte/rules/derived-has-same-inputs-outputs/) | derived store should use same variable names between values and callback |  |
 | [svelte/first-attribute-linebreak](https://sveltejs.github.io/eslint-plugin-svelte/rules/first-attribute-linebreak/) | enforce the location of first attribute | :wrench: |
 | [svelte/html-closing-bracket-new-line](https://sveltejs.github.io/eslint-plugin-svelte/rules/html-closing-bracket-new-line/) | Require or disallow a line break before tag's closing brackets | :wrench: |

docs/rules.md

@@ -76,6 +76,7 @@ These rules relate to style guidelines, and are therefore quite subjective:
 
 | Rule ID                                                                                                  | Description                                                                        |          |
 | :------------------------------------------------------------------------------------------------------- | :--------------------------------------------------------------------------------- | :------- |
+| [svelte/consistent-selector-style](./rules/consistent-selector-style.md)                                 | enforce a consistent style for CSS selectors                                       |          |
 | [svelte/derived-has-same-inputs-outputs](./rules/derived-has-same-inputs-outputs.md)                     | derived store should use same variable names between values and callback           |          |
 | [svelte/first-attribute-linebreak](./rules/first-attribute-linebreak.md)                                 | enforce the location of first attribute                                            | :wrench: |
 | [svelte/html-closing-bracket-new-line](./rules/html-closing-bracket-new-line.md)                         | Require or disallow a line break before tag's closing brackets                     | :wrench: |

docs/rules/consistent-selector-style.md

@@ -0,0 +1,51 @@
+---
+pageClass: 'rule-details'
+sidebarDepth: 0
+title: 'svelte/consistent-selector-style'
+description: 'enforce a consistent style for CSS selectors'
+---
+
+# svelte/consistent-selector-style
+
+> enforce a consistent style for CSS selectors
+
+- :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 reports ???.
+
+<ESLintCodeBlock>
+
+<!--eslint-skip-->
+
+```svelte
+<script>
+  /* eslint svelte/consistent-selector-style: "error" */
+</script>
+
+<!-- ✓ GOOD -->
+
+<!-- ✗ BAD -->
+```
+
+</ESLintCodeBlock>
+
+## :wrench: Options
+
+```json
+{
+  "svelte/consistent-selector-style": ["error", {}]
+}
+```
+
+-
+
+## :books: Further Reading
+
+-
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/sveltejs/eslint-plugin-svelte/blob/main/packages/eslint-plugin-svelte/src/rules/consistent-selector-style.ts)
+- [Test source](https://github.com/sveltejs/eslint-plugin-svelte/blob/main/packages/eslint-plugin-svelte/tests/src/rules/consistent-selector-style.ts)

packages/eslint-plugin-svelte/src/rule-types.ts

@@ -34,6 +34,11 @@ export interface RuleOptions {
    * @see https://sveltejs.github.io/eslint-plugin-svelte/rules/comment-directive/
    */
   'svelte/comment-directive'?: Linter.RuleEntry<SvelteCommentDirective>
+  /**
+   * enforce a consistent style for CSS selectors
+   * @see https://sveltejs.github.io/eslint-plugin-svelte/rules/consistent-selector-style/
+   */
+  'svelte/consistent-selector-style'?: Linter.RuleEntry<[]>
   /**
    * derived store should use same variable names between values and callback
    * @see https://sveltejs.github.io/eslint-plugin-svelte/rules/derived-has-same-inputs-outputs/

packages/eslint-plugin-svelte/src/rules/consistent-selector-style.ts

@@ -0,0 +1,17 @@
+import { createRule } from '../utils';
+
+export default createRule('consistent-selector-style', {
+	meta: {
+		docs: {
+			description: 'enforce a consistent style for CSS selectors',
+			category: 'Stylistic Issues',
+			recommended: false
+		},
+		schema: [],
+		messages: {},
+		type: 'suggestion'
+	},
+	create(context) {
+		return {};
+	}
+});

packages/eslint-plugin-svelte/src/utils/rules.ts

@@ -6,6 +6,7 @@ import typescriptEslintNoUnnecessaryCondition from '../rules/@typescript-eslint/
 import blockLang from '../rules/block-lang';
 import buttonHasType from '../rules/button-has-type';
 import commentDirective from '../rules/comment-directive';
+import consistentSelectorStyle from '../rules/consistent-selector-style';
 import derivedHasSameInputsOutputs from '../rules/derived-has-same-inputs-outputs';
 import experimentalRequireSlotTypes from '../rules/experimental-require-slot-types';
 import experimentalRequireStrictEvents from '../rules/experimental-require-strict-events';
@@ -73,6 +74,7 @@ export const rules = [
 	blockLang,
 	buttonHasType,
 	commentDirective,
+	consistentSelectorStyle,
 	derivedHasSameInputsOutputs,
 	experimentalRequireSlotTypes,
 	experimentalRequireStrictEvents,

packages/eslint-plugin-svelte/tests/src/rules/consistent-selector-style.ts

@@ -0,0 +1,12 @@
+import { RuleTester } from '../../utils/eslint-compat';
+import rule from '../../../src/rules/consistent-selector-style';
+import { loadTestCases } from '../../utils/utils';
+
+const tester = new RuleTester({
+	languageOptions: {
+		ecmaVersion: 2020,
+		sourceType: 'module'
+	}
+});
+
+tester.run('consistent-selector-style', rule as any, loadTestCases('consistent-selector-style'));