add eslint

Author: liady

.eslintrc.js

@@ -0,0 +1,15 @@
+module.exports = {
+    env: {
+        commonjs: true,
+        es2020: true,
+        node: true,
+        mocha: true,
+    },
+    extends: 'eslint:recommended',
+    parserOptions: {
+        ecmaVersion: 12,
+    },
+    rules: {
+        'no-prototype-builtins': 0,
+    },
+};