refactor(ci): Lint PR diffs only (#4137)

* ✨ Set up `eslint-plugin-diff`

* 🔧 Fix setup

* ⬆️ Upgrade `checkout` and `setup-node`

* 🔧 Fix YAML

* 🧪 Verify `eslint-plugin-diff` behavior

* Revert "🧪 Verify `eslint-plugin-diff` behavior"

This reverts commit 1fcc6c8299.

* ✏️ Fix comment

.github/workflows/ci-pull-requests.yml

@@ -13,18 +13,27 @@ jobs:
         node-version: [14.x, 16.x]
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
+
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
           cache: 'npm'
-      - name: npm install, build, and test
-        run: |
-          npm install -g npm@latest
-          npm install
-          npm run build --if-present
-          npm test
-          npm run lint
+
+      - name: Install npm and dependencies
+        run: npm install -g npm@latest && npm install
+
+      - name: Build
+        run: npm run build --if-present
+
+      - name: Test
+        run: npm run test
+
+      - name: Fetch base branch for `git diff`
+        run: git fetch origin ${{ github.event.pull_request.base.ref }}:${{ github.event.pull_request.base.ref }}
+
+      - name: Run ESLint on changes only
         env:
-          CI: true
+          ESLINT_PLUGIN_DIFF_COMMIT: ${{ github.event.pull_request.base.ref }}
+        run: npm run lint

package-lock.json

@@ -21790,6 +21790,18 @@
         "ms": "^2.1.1"
       }
     },
+    "node_modules/eslint-plugin-diff": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-diff/-/eslint-plugin-diff-2.0.1.tgz",
+      "integrity": "sha512-qqbvwaaO1cfkUprliqiRojRsD0qGsvzmJNqNrb9s0h15sDVzZMXYdu0TUFpUwauLeU28etSsfWIp0Uu+OAcXXw==",
+      "dev": true,
+      "engines": {
+        "node": ">=14.0.0"
+      },
+      "peerDependencies": {
+        "eslint": ">=6.7.0"
+      }
+    },
     "node_modules/eslint-plugin-import": {
       "version": "2.26.0",
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.26.0.tgz",
@@ -52138,6 +52150,7 @@
         "eslint": "8.23.0",
         "eslint-config-airbnb-typescript": "^17.0.0",
         "eslint-config-prettier": "^8.5.0",
+        "eslint-plugin-diff": "^2.0.1",
         "eslint-plugin-import": "^2.26.0",
         "eslint-plugin-prettier": "^4.2.1",
         "eslint-plugin-vue": "^9.4.0"
@@ -55958,6 +55971,7 @@
         "eslint": "8.23.0",
         "eslint-config-airbnb-typescript": "^17.0.0",
         "eslint-config-prettier": "^8.5.0",
+        "eslint-plugin-diff": "^2.0.1",
         "eslint-plugin-import": "^2.26.0",
         "eslint-plugin-prettier": "^4.2.1",
         "eslint-plugin-vue": "^9.4.0"
@@ -70014,6 +70028,12 @@
         }
       }
     },
+    "eslint-plugin-diff": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/eslint-plugin-diff/-/eslint-plugin-diff-2.0.1.tgz",
+      "integrity": "sha512-qqbvwaaO1cfkUprliqiRojRsD0qGsvzmJNqNrb9s0h15sDVzZMXYdu0TUFpUwauLeU28etSsfWIp0Uu+OAcXXw==",
+      "dev": true
+    },
     "eslint-plugin-import": {
       "version": "2.26.0",
       "resolved": "https://registry.npmjs.org/eslint-plugin-import/-/eslint-plugin-import-2.26.0.tgz",

packages/@n8n_io/eslint-config/base.js

@@ -33,6 +33,13 @@ module.exports = {
 		 * https://github.com/prettier/eslint-plugin-prettier
 		 */
 		'eslint-plugin-prettier',
+
+		/**
+		 * Plugin to lint only changes
+		 *
+		 * https://github.com/paleite/eslint-plugin-diff#plugindiffdiff-recommended
+		 */
+		'eslint-plugin-diff',
 	],
 
 	extends: [
@@ -64,6 +71,13 @@ module.exports = {
 		 * https://github.com/prettier/eslint-config-prettier
 		 */
 		'eslint-config-prettier',
+
+		/**
+		 * Config for eslint-plugin-diff
+		 *
+		 * https://github.com/paleite/eslint-plugin-diff#plugindiffdiff-recommended
+		 */
+		'plugin:diff/diff',
 	],
 
 	rules: {
@@ -180,10 +194,7 @@ module.exports = {
 		/**
 		 * https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/explicit-member-accessibility.md
 		 */
-		'@typescript-eslint/explicit-member-accessibility': [
-			'error',
-			{ accessibility: 'no-public' },
-		],
+		'@typescript-eslint/explicit-member-accessibility': ['error', { accessibility: 'no-public' }],
 
 		/**
 		 * https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/docs/rules/member-delimiter-style.md

packages/@n8n_io/eslint-config/package.json

@@ -9,6 +9,7 @@
     "eslint": "8.23.0",
     "eslint-config-airbnb-typescript": "^17.0.0",
     "eslint-config-prettier": "^8.5.0",
+    "eslint-plugin-diff": "^2.0.1",
     "eslint-plugin-import": "^2.26.0",
     "eslint-plugin-prettier": "^4.2.1",
     "eslint-plugin-vue": "^9.4.0"