Basic project linting

.eslintrc.json

 {
     "extends": [
         "eslint:recommended",
-        "prettier:recommended",
-        "@typescript-eslint/recommended"
+        "prettier"
     ],
     "env": {
         "commonjs": true

.gitignore

@@ -5,3 +5,4 @@ npm-debug.log
 .env
 coverage
 lib
+.eslintcache

package.json

@@ -13,7 +13,9 @@
   ],
   "scripts": {
     "start": "probot run ./index.js",
-    "test": "jest"
+    "test": "jest",
+    "lint": "eslint index.js --cache",
+    "lint:fix": "eslint index.js --cache --fix"
   },
   "dependencies": {
     "@polkadot/api": "^6.0.5",
@@ -21,8 +23,12 @@
     "probot": "^11.0.1"
   },
   "devDependencies": {
+    "eslint": "^7.32.0",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-plugin-prettier": "^4.0.0",
     "jest": "^26.6.3",
     "nock": "^13.0.5",
+    "prettier": "^2.4.1",
     "smee-client": "^1.2.2"
   },
   "engines": {