check added nodes from removed nodes and dropped nodes

package.json

@@ -1,6 +1,6 @@
 {
   "name": "rrweb",
-  "version": "0.4.1",
+  "version": "0.4.2",
   "description": "record and replay the web",
   "main": "dist/index.js",
   "module": "dist/module.js",
@@ -15,6 +15,11 @@
   "keywords": [
     "rrweb"
   ],
+  "files": [
+    "dist",
+    "index.d.ts",
+    "src/types.ts"
+  ],
   "author": "yanzhen@smartx.com",
   "license": "MIT",
   "bugs": {
@@ -26,10 +31,12 @@
     "@types/mocha": "^5.2.5",
     "@types/node": "^10.11.7",
     "@types/puppeteer": "^1.9.0",
+    "@types/rewire": "^2.5.28",
     "chai": "^4.2.0",
     "jest-snapshot": "^23.6.0",
     "mocha": "^5.2.0",
     "puppeteer": "^1.9.0",
+    "rewire": "^4.0.1",
     "rollup": "^0.66.6",
     "rollup-plugin-node-resolve": "^3.4.0",
     "rollup-plugin-typescript": "^1.0.0",