Introduce prettier and eslint for typescript

Author: sduduzog

.eslintignore

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

.eslintrc.js

@@ -0,0 +1,8 @@
+module.exports = {
+  parser: "@typescript-eslint/parser",
+  extends: ["prettier"],
+  plugins: ["@typescript-eslint", "prettier"],
+  rules: {
+    "prettier/prettier": ["error"],
+  },
+};

.prettierrc.js

@@ -0,0 +1,4 @@
+module.exports = {
+  trailingComma: "es5",
+  arrowParens: "avoid",
+};

package.json

@@ -11,6 +11,7 @@
   "scripts": {
     "prepare": "npm run build",
     "test": "echo 'no tests to run'",
+    "lint": "eslint . --ext .ts",
     "build": "tsc -p config/tsconfig.cjs.json && tsc -p config/tsconfig.esm.json && tsc -p config/tsconfig.types.json"
   },
   "repository": {
@@ -38,6 +39,12 @@
     "vue": "^2.0.0 || >=3.0.0"
   },
   "devDependencies": {
+    "@typescript-eslint/eslint-plugin": "^5.1.0",
+    "@typescript-eslint/parser": "^5.1.0",
+    "eslint": "^8.0.1",
+    "eslint-config-prettier": "^8.3.0",
+    "eslint-plugin-prettier": "^4.0.0",
+    "prettier": "^2.4.1",
     "typescript": "^4.3.5"
   }
 }