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abTestAssignment: defer setupAB hooks onto pbjs.que when Prebid not ready #311

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abTestAssignment: defer setupAB hooks onto pbjs.que when Prebid not ready #311

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17 changes: 16 additions & 1 deletion lib/addons/abTestAssignment.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -134,7 +134,7 @@ export function setupAB(config: SetupABConfig): ABTestSetupResult {
});
}

function setHooks(pbjsInstance: any): void {
function registerHooks(pbjsInstance: any): void {
pbjsInstance.getEvents().forEach((event: any) => {
if (event.eventType === "auctionEnd") {
applyToAuctionEvent(event.args);
Expand All @@ -143,6 +143,21 @@ export function setupAB(config: SetupABConfig): ABTestSetupResult {
pbjsInstance.onEvent("auctionEnd", applyToAuctionEvent);
}

// Mirrors OptablePrebidAnalytics.hookIntoPrebid: when Prebid.js has not
// finished loading yet (`onEvent` is not a function), defer registration onto
// its command queue so hooks attach once the real global drains `que`.
// This lets callers pass a queue-only stub (`{ que: [] }`) safely instead of
// having to queue `setHooks` themselves.
function setHooks(pbjsInstance: any): void {
if (!pbjsInstance) return;
if (typeof pbjsInstance.onEvent !== "function") {
pbjsInstance.que = pbjsInstance.que || [];
pbjsInstance.que.push(() => registerHooks(pbjsInstance));
} else {
registerHooks(pbjsInstance);
}
}

if (pbjs) {
setHooks(pbjs);
}
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