feat: support eslint@8 (#940)

Co-authored-by: Gareth Jones <jones258@gmail.com>
Co-authored-by: Michaël De Boey <info@michaeldeboey.be>

Author: 3 people

.github/workflows/nodejs.yml

@@ -68,8 +68,12 @@ jobs:
       fail-fast: false
       matrix:
         node-version: [12.x, 14.x, 16.x]
-        eslint-version: [6, 7]
+        eslint-version: [6, 7, 8]
         ts-eslint-plugin-version: [4, 5]
+        exclude:
+          # ts-eslint/plugin@4 doesn't support eslint@8
+          - eslint-version: 8
+            ts-eslint-plugin-version: 4
     runs-on: ubuntu-latest
 
     steps:

package.json

@@ -60,6 +60,9 @@
     "projects": [
       {
         "displayName": "test",
+        "moduleNameMapper": {
+          "eslint/use-at-your-own-risk": "eslint/lib/unsupported-api.js"
+        },
         "testPathIgnorePatterns": [
           "<rootDir>/lib/.*",
           "<rootDir>/src/rules/__tests__/fixtures/*",
@@ -100,7 +103,7 @@
     "babel-jest": "^27.0.0",
     "babel-plugin-replace-ts-export-assignment": "^0.0.2",
     "dedent": "^0.7.0",
-    "eslint": "^6.0.0 || ^7.0.0",
+    "eslint": "^6.0.0 || ^7.0.0 || ^8.0.0",
     "eslint-config-prettier": "^8.3.0",
     "eslint-plugin-eslint-comments": "^3.1.2",
     "eslint-plugin-eslint-config": "^2.0.0",
@@ -123,7 +126,7 @@
   },
   "peerDependencies": {
     "@typescript-eslint/eslint-plugin": "^4.0.0 || ^5.0.0",
-    "eslint": "^6.0.0 || ^7.0.0"
+    "eslint": "^6.0.0 || ^7.0.0 || ^8.0.0"
   },
   "peerDependenciesMeta": {
     "@typescript-eslint/eslint-plugin": {
@@ -149,5 +152,8 @@
       "@semantic-release/git",
       "@semantic-release/github"
     ]
+  },
+  "resolutions": {
+    "@typescript-eslint/experimental-utils": "^5.0.0"
   }
 }