How to convert an `IO ()` to `JSVal` in GHCJS

问题

i want to execute some effectful computation on a regular basis in a program compiled with GHCJS, but GHCJS.DOM.WindowTimers.setInterval wants a JSVal as parameter. Could anybody give me some pointers for turning my IO () into a JSVal?

Edit:

I was able to match the types using GHCJS.Foreign.Callback.asyncCallback and GHCJS.Types.jsval, but i have eventually got a runtime error. Luite in the GHCJS channel suggested to use threads for this task, as Erik suggested in a comment here. This is explained in the corresponding question

来源：https://stackoverflow.com/questions/33576618/how-to-convert-an-io-to-jsval-in-ghcjs