feat(eslint): enforce blank line before return and after directives (…

…#54)

eslint/configs/_base.js

@@ -1,6 +1,7 @@
 const commentsRules = require('../rules/comments');
 const importRules = require('../rules/import');
 const standardRules = require('../rules/standard');
+const stylisticRules = require('../rules/stylistic');
 const unicornRules = require('../rules/unicorn');
 
 // See: https://github.com/eslint/eslint/issues/3458
@@ -19,11 +20,12 @@ module.exports = {
     'plugin:unicorn/recommended',
     'plugin:prettier/recommended',
   ],
-  plugins: ['simple-import-sort'],
+  plugins: ['@stylistic', 'simple-import-sort'],
   // Report unused `eslint-disable` comments.
   reportUnusedDisableDirectives: true,
   rules: {
     ...standardRules,
+    ...stylisticRules,
     ...commentsRules,
     ...importRules,
     ...unicornRules,

eslint/rules/stylistic.js

@@ -0,0 +1,16 @@
+module.exports = {
+  /**
+   * This rule requires or disallows blank lines between the given 2 kinds of
+   * statements. Properly blank lines help developers to understand the code.
+   *
+   * 🔧 Fixable - https://eslint.style/rules/js/padding-line-between-statements
+   */
+  '@stylistic/padding-line-between-statements': [
+    'warn',
+    // Blank line before `return`
+    { blankLine: 'always', next: 'return', prev: '*' },
+    // Blank line after all directives (e.g. `use strict`)
+    { blankLine: 'always', next: '*', prev: 'directive' },
+    { blankLine: 'any', next: 'directive', prev: 'directive' },
+  ],
+};

package.json

@@ -32,6 +32,7 @@
     "@babel/core": "^7.23.3",
     "@babel/eslint-parser": "^7.23.3",
     "@rushstack/eslint-patch": "^1.6.0",
+    "@stylistic/eslint-plugin": "^1.4.1",
     "@typescript-eslint/eslint-plugin": "^6.12.0",
     "eslint-config-prettier": "^9.0.0",
     "eslint-import-resolver-typescript": "^3.6.1",