chore: configure project wide linter (#577)

* chore(lint): configure project-wide linter

* chore(lint): improve linting in files

* chore(lint): hide warnings in CI

.eslintrc

@@ -6,8 +6,16 @@
     "es6": true,
     "jest": true
   },
+  "parser": "@typescript-eslint/parser",
   "extends": [
-    "eslint:recommended"
+    "eslint:recommended",
+    "plugin:@typescript-eslint/recommended",
+    "prettier",
+    "eslint-config-prettier"
+  ],
+  "plugins": [
+    "@typescript-eslint",
+    "prettier"
   ],
   "overrides": [
     {
@@ -21,6 +29,27 @@
     }
   ],
   "rules": {
-    "no-console": ["warn", { "allow": ["warn", "error"]}]
+    "no-useless-concat": "warn",
+    "prefer-template": "warn",
+    "no-console": [
+      "warn",
+      {
+        "allow": [
+          "warn",
+          "error"
+        ]
+      }
+    ],
+    "@typescript-eslint/no-non-null-assertion": "warn",
+    "@typescript-eslint/no-unused-vars": [
+      "error",
+      {
+        "argsIgnorePattern": "^_",
+        "caughtErrorsIgnorePattern": "^_",
+        "destructuredArrayIgnorePattern": "^_",
+        "varsIgnorePattern": "^_"
+      }
+    ],
+    "prettier/prettier": "warn"
   }
 }