Build: test on eslint v8 (fixes #175) (#186)

* --wip-- [skip ci]

* Build: test on eslint v8

* chore: upgrade to 8.0.0-rc.0

* fix: use fisker/eslint-plugin-unicorn

* chore: upgrade espree & eslint-scope to use the same version as eslint v8

* Update package.json

* Update package.json

Co-authored-by: Bryan Mishkin <698306+bmish@users.noreply.github.com>

Co-authored-by: Bryan Mishkin <698306+bmish@users.noreply.github.com>

.github/workflows/main.yml

@@ -22,7 +22,8 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           node-version: ${{ matrix.node-version }}
-      - run: npm install
+      # TODO: remove "--force" once eslint v8 released
+      - run: npm install --force
       - run: npm test
 
   lint:
@@ -41,3 +42,13 @@ jobs:
     - run: npm install
     - run: npm install --save-dev eslint@6
     - run: npm test
+
+  eslint7:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-node@v2
+    - run: npm install
+    - run: npm install --save-dev eslint@7
+    - run: npm test
+

package.json

@@ -41,14 +41,14 @@
   "devDependencies": {
     "chai": "^4.1.0",
     "dirty-chai": "^2.0.1",
-    "eslint": "^7.9.0",
+    "eslint": "^8.0.0",
     "eslint-config-not-an-aardvark": "^2.1.0",
     "eslint-plugin-markdown": "^2.0.1",
     "eslint-plugin-node": "^11.1.0",
     "eslint-plugin-self": "^1.2.1",
-    "eslint-plugin-unicorn": "^36.0.0",
-    "eslint-scope": "^5.1.1",
-    "espree": "^7.3.0",
+    "eslint-plugin-unicorn": "github:fisker/eslint-plugin-unicorn#eslint-8",
+    "eslint-scope": "^6.0.0",
+    "espree": "^9.0.0",
     "estraverse": "^5.0.0",
     "lodash": "^4.17.2",
     "markdownlint-cli": "^0.28.1",