Coinflip experiment in WWW/JS

Reviewed By: lacbs Differential Revision: D49342225 fbshipit-source-id: e172135c5be77282f00eda777b7935d4b828276d
facebook · Sep 27, 2023 · 084a52c · 084a52c
1 parent e072c6f
commit 084a52c
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/runtime/shared/FbtHooksImpl.js b/runtime/shared/FbtHooksImpl.js
@@ -14,13 +14,26 @@ import type {
 } from 'FbtHooks';
 import typeof IntlViewerContext from 'IntlViewerContext';
 
+import {coinflip} from 'Random';
+
+import qex from 'qex';
+
 const _registrations: FbtHookRegistrations = {};
 const FbtHooksImpl = {
   getErrorListener(context: FbtErrorContext): ?IFbtErrorListener {
     return _registrations.errorListener?.(context);
   },
 
   logImpression(hash: string): void {
+    const coinflipValue = qex.getNumber(
+      'fbt_js_performance_testing',
+      'coinflip_value',
+    );
+
+    if (coinflipValue != null && coinflipValue !== 0) {
+      coinflip(coinflipValue);
+    }
+
     _registrations.logImpression?.(hash);
   },