test: run against ESLint v9 (#926)

Author: G-Rath

.github/workflows/verifications.yml

@@ -31,11 +31,26 @@ jobs:
   tests:
     name: Tests (Node v${{ matrix.node }} - ESLint v${{ matrix.eslint }})
     runs-on: ubuntu-latest
+    timeout-minutes: 3
     strategy:
       fail-fast: false
       matrix:
         node: [12.22.0, 12, 14.17.0, 14, 16, 17, 18, 19, 20, 22]
-        eslint: [7.5, 7, 8]
+        eslint: [7.5, 7, 8, 9]
+        exclude:
+          # eslint@9 doesn't support < Node v18
+          - node: 17
+            eslint: 9
+          - node: 16
+            eslint: 9
+          - node: 14
+            eslint: 9
+          - node: 14.17.0
+            eslint: 9
+          - node: 12
+            eslint: 9
+          - node: 12.22.0
+            eslint: 9
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -49,6 +64,10 @@ jobs:
       - name: Install dependencies
         run: npm install
 
+        # see https://github.com/npm/cli/issues/7349
+      - if: ${{ matrix.eslint == 9 }}
+        run: npm un @typescript-eslint/eslint-plugin eslint-plugin-jest eslint-doc-generator
+
       - name: Install ESLint v${{ matrix.eslint }}
         run: npm install --no-save --force eslint@${{ matrix.eslint }}