chore: set compilerOptions.target as es2015

Author: Amour1688

tsconfig.json

@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "sourceMap": false,
-    "target": "es5",
+    "target": "es2015",
     "module": "commonjs",
     "moduleResolution": "node",
     "allowJs": true,
@@ -13,7 +13,7 @@
     "removeComments": false,
     "jsx": "preserve",
     "lib": ["esnext", "dom"],
-    "types": ["node"],
+    "types": ["node"]
   },
   "include": [
     "global.d.ts"