fix: support for ES2015 features

Author: JN0122

package.json

@@ -2,7 +2,7 @@
   "name": "leetcode",
   "version": "1.0.0",
   "scripts": {
-    "dev": "tsc -w ./src/index.ts"
+    "dev": "tsc -w"
   },
   "author": "Jakub Niewelt",
   "license": "ISC",

tsconfig.json

@@ -1,7 +1,10 @@
 {
   "compilerOptions": {
     "noImplicitAny": true,
+    "rootDir": "./src/",
     "target": "ES5",
-    "module": "ES2015"
-  }
+    "module": "ES2015",
+    "lib": ["ES2015", "DOM"]
+  },
+  "exclude": ["archive"]
 }