add typings script to prepack

Author: Yuyz0112

package.json

@@ -4,7 +4,7 @@
   "description": "rrweb's component to take a snapshot of DOM, aka DOM serializer",
   "scripts": {
     "prepare": "npm run prepack",
-    "prepack": "npm run bundle",
+    "prepack": "npm run bundle && npm run typings",
     "test": "cross-env TS_NODE_CACHE=false TS_NODE_FILES=true mocha -r ts-node/register test/**/*.ts",
     "bundle": "rollup --config",
     "typings": "tsc -d --declarationDir typings"

src/snapshot.ts

@@ -165,7 +165,11 @@ export function transformAttribute(
   // relative path in attribute
   if (name === 'src' || ((name === 'href' || name === 'xlink:href') && value)) {
     return absoluteToDoc(doc, value);
-  } else if (name === 'background' && value && (tagName === 'table' || tagName == 'td' || tagName == 'th')) {
+  } else if (
+    name === 'background' &&
+    value &&
+    (tagName === 'table' || tagName === 'td' || tagName === 'th')
+  ) {
     return absoluteToDoc(doc, value);
   } else if (name === 'srcset' && value) {
     return getAbsoluteSrcsetString(doc, value);