Add watch incremental build npm script

Yukaii · Yukaii · commit 761daeff8f4b · 2020-05-11T12:04:03.000+08:00
diff --git a/nodejs/package.json b/nodejs/package.json
@@ -6,6 +6,7 @@
   "declaration": "./dist/index.d.ts",
   "scripts": {
     "build": "tsc -d",
+    "watch": "tsc -w",
     "prepublishOnly": "npm run build"
   },
   "keywords": [
