chore: Add ESLint 7 support (#39)

Author: pmdartus

.circleci/config.yml

@@ -1,8 +1,9 @@
-version: 2
+version: 2.1
+
 jobs:
   build:
     docker:
-      - image: circleci/node:10
+      - image: circleci/node
 
     steps:
       - checkout
@@ -11,13 +12,45 @@ jobs:
           keys:
           - v1-dependencies-{{ checksum "yarn.lock" }}
           - v1-dependencies-
-
+      
       - run: yarn install --frozen-lock
 
       - save_cache:
           paths:
             - node_modules
           key: v1-dependencies-{{ checksum "yarn.lock" }}
+
+      - run: yarn format:check
+      - run: yarn lint
+      - run: yarn test
+
+  test_eslint:
+    docker:
+      - image: circleci/node
+
+    parameters:
+      eslint:
+        type: string
+
+    steps:
+      - checkout
+
+      - restore_cache:
+          keys:
+          - v1-dependencies-{{ checksum "yarn.lock" }}
+          - v1-dependencies-
 
-      - run: yarn format -- --list-different
+      - run: yarn install --frozen-lock
+      - run: yarn add --dev eslint@<< parameters.eslint >>
       - run: yarn test
+
+workflows:
+  build_and_test:
+    jobs:
+      - build
+      - test_eslint:
+          requires:
+            - build
+          matrix:
+            parameters:
+              eslint: ["6", "7"]

package.json

@@ -12,25 +12,26 @@
   ],
   "scripts": {
     "format": "prettier --write \"**/*.{js,md}\"",
+    "format:check": "prettier --check \"**/*.{js,md}\"",
     "lint": "eslint",
     "test": "mocha"
   },
   "dependencies": {
     "@lwc/eslint-plugin-lwc": "~0.10.0",
     "babel-eslint": "~10.1.0",
-    "eslint-plugin-import": "~2.20.2",
+    "eslint-plugin-import": "~2.22.1",
     "eslint-plugin-jest": "~23.8.2",
     "eslint-restricted-globals": "~0.2.0"
   },
   "devDependencies": {
-    "eslint": "^6.8.0",
-    "husky": "^4.2.5",
-    "lint-staged": "^10.1.6",
-    "mocha": "^7.1.1",
-    "prettier": "^2.0.4"
+    "eslint": "^7.13.0",
+    "husky": "^4.3.0",
+    "lint-staged": "^10.5.1",
+    "mocha": "^8.2.1",
+    "prettier": "^2.1.2"
   },
   "peerDependencies": {
-    "eslint": "^6.0.0"
+    "eslint": "^6 || ^7"
   },
   "repository": {
     "type": "git",
@@ -48,7 +49,7 @@
   ],
   "husky": {
     "hooks": {
-      "pre-commit": "lint-staged && yarn format"
+      "pre-commit": "lint-staged"
     }
   },
   "lint-staged": {