add tslint & prettier

.eslintignore

@@ -0,0 +1,2 @@
+node_modules
+dist

.eslintrc

@@ -0,0 +1,12 @@
+{
+    "root": true,
+    "parser": "@typescript-eslint/parser",
+    "plugins": [
+      "@typescript-eslint"
+    ],
+    "extends": [
+      "eslint:recommended",
+      "plugin:@typescript-eslint/eslint-recommended",
+      "plugin:@typescript-eslint/recommended"
+    ]
+  }

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "semi": true,
+  "trailingComma": "none",
+  "singleQuote": true,
+  "printWidth": 80
+}

package.json

@@ -5,11 +5,17 @@
   "main": "index.js",
   "scripts": {
     "dev": "yarn tsc -w",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "lint": "eslint . --ext .ts",
+    "prettier-format": "prettier --config .prettierrc 'src/**/*.ts' --write"
   },
   "author": "",
   "license": "ISC",
   "devDependencies": {
-    "typescript": "^4.6.3"
+    "@typescript-eslint/eslint-plugin": "^5.21.0",
+    "@typescript-eslint/parser": "^5.21.0",
+    "eslint": "^8.14.0",
+    "typescript": "^4.6.3",
+    "prettier": "^2.6.2"
   }
 }