fix: extend the PageView type to allow arbitrary keys

Author: ydennisy

src/store/pageview.ts

@@ -41,7 +41,7 @@ class ViewStore {
   ): void {
     if (!features || Object.keys(features).length < 1) return;
     const ts = timeStampInSecs();
-    const pageView = {
+    const pageView: PageView = {
       ts,
       features,
       ...metadata,

types/index.ts

@@ -5,10 +5,11 @@ export type PageFeatureResult = {
   value: number[];
 };
 
-export interface PageView {
+export type PageView = {
   ts: number;
   features: Record<string, PageFeatureResult>;
-}
+  [key: string]: any;
+};
 
 // Audience definition interfaces