first and third party script info

README.md

@@ -175,4 +175,72 @@ function getImgs(sortBy) {
 }
 console.table(getImgs('encodedBodySize'))
 
-```
+```
+
+### First And Third Party Script Info
+
+List all scripts using PerformanceResourceTiming API and separating them by first and third party
+
+[More Info](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming)
+
+[Info On CORS](https://developer.mozilla.org/en-US/docs/Web/API/Resource_Timing_API/Using_the_Resource_Timing_API#coping_with_cors)
+
+```js
+// ex: katespade.com - list firsty party subdomains in HOSTS array
+const HOSTS = ["assets.katespade.com"];
+
+function getScriptInfo() {
+ const resourceListEntries = performance.getEntriesByType("resource");
+ // set for first party scripts
+ const first = [];
+ // set for third party scripts
+ const third = [];
+
+ resourceListEntries.forEach((resource) => {
+ // check for initiator type
+ const value = "initiatorType" in resource;
+ if (value) {
+ if (resource.initiatorType === "script") {
+ const { host } = new URL(resource.name);
+ // check if resource url host matches location.host = first party script
+ if (host === location.host || HOSTS.includes(host)) {
+ const json = resource.toJSON();
+ first.push({ ...json, type: "First Party" });
+ } else {
+ // add to third party script
+ const json = resource.toJSON();
+ third.push({ ...json, type: "Third Party" });
+ }
+ }
+ }
+ });
+
+ return {
+ ...(first.length && { firstParty: first }),
+ ...(third.length && { thirdParty: third }),
+ };
+}
+
+const { firstParty, thirdParty } = getScriptInfo();
+
+console.groupCollapsed("FIRST PARTY SCRIPTS");
+console.table(firstParty);
+console.groupEnd();
+console.groupCollapsed("THIRD PARTY SCRIPTS");
+console.table(thirdParty);
+console.groupEnd();
+
+/*
+Choose which properties to display
+https://developer.mozilla.org/en-US/docs/Web/API/console/table
+
+console.groupCollapsed("FIRST PARTY SCRIPTS");
+console.table(firstParty, ["name", "nextHopProtocol"]);
+console.groupEnd();
+console.groupCollapsed("THIRD PARTY SCRIPTS", ["name", "nextHopProtocol"]);
+console.group();
+console.table(thirdParty);
+console.groupEnd();
+*/
+
+```