Sets a callback function that is called by the runtime before garbage collection of an object.

STDAPI_(JsErrorCode) JsSetObjectBeforeCollectCallback( _In_ JsRef ref, _In_opt_ void *callbackState, _In_ JsObjectBeforeCollectCallback objectBeforeCollectCallback); 

• ref: The object for which to register the callback.
• callbackState: User provided state that will be passed back to the callback.
• objectBeforeCollectCallback: The callback function being set. Use null to clear previously registered callback.

The code JsNoError if the operation succeeded, a failure code otherwise.

The callback is invoked on the current runtime execution thread, therefore execution is blocked until the callback completes.