Fix race condition when using Form and Link Click tracking (close #962)

Author: Paul Boocock

common/changes/@snowplow/browser-tracker-core/release-3.0.3_2021-04-21-10-13.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "packageName": "@snowplow/browser-tracker-core",
+      "comment": "Fix race condition when using Form and Link Click tracking (#962)",
+      "type": "none"
+    }
+  ],
+  "packageName": "@snowplow/browser-tracker-core",
+  "email": "paul@snowplowanalytics.com"
+}

libraries/browser-tracker-core/src/state.ts

@@ -127,7 +127,12 @@ export function createSharedState(): SharedState {
   }
   // Last attempt at flushing in beforeunload
   addEventListener(windowAlias, 'beforeunload', flushBuffers, false);
-  addReadyListener();
+
+  if (document.readyState === 'loading') {
+    addReadyListener();
+  } else {
+    loadHandler();
+  }
 
   return sharedState;
 }