Function mozjs::jsapi::CallOriginalPromiseThen

pub unsafe extern "C" fn CallOriginalPromiseThen(
    cx: *mut JSContext, 
    promise: HandleObject, 
    onResolve: HandleObject, 
    onReject: HandleObject
) -> *mut JSObject

Calls the current compartment's original Promise.prototype.then on the given promise, with onResolve and onReject passed as arguments.

Asserts if the passed-in promise object isn't an unwrapped instance of Promise or a subclass or onResolve and onReject aren't both either nullptr or callable objects.