'Missing Line in Sream Method

so just like the titles said. there is a missing line that I wanna figure out what it is and I cannot find out what it is. one way to use it is

Request.once("response", (resultStream) => helperMethods.streamFun(resultStream, recivedGIFS , res));


function recivedGIFS(objc, callback)
{...}

Code after line two is available, but I'm not sure about line 1, lets assume the name of the function is streamFun, but there seems to have things before it/after it



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