Compiling Haskell module to Javascript using ghcjs

Question

Is it possible to compile a Haskell module to JS using ghcjs? I played with it, but it seems it requires main function to be defined before it would generate JS. A toy code below:

module Test where

add :: Int -> Int -> Int
add x y = x + y

I can't figure out how to compile it to JS using ghcjs. It will compile only .hi and .o files if main function is not defined. If I can figure out a way to compile it to JS (with appropriate Z-encoded function name, and a corresponding JS object, like what we have in FFI for C), then I could use more powerful Haskell libraries like unordered-containers and vector to implement some algorithm, compile to JS, and use in Elm through JS FFI.

Fay seems to be capable of doing it. I will like to investigate it for ghcjs first.

@JoachimBreitner, ` ghcjs Test.hs` where Test.hs is above code. ghcjs claims it is "generating JavaScript" but I don't see any js code. I am using version 0.1.0. — Sal
– Sal, Commented Jun 11, 2014 at 13:50
@JoachimBreitner, adding -c option doesn't make any difference either. — Sal
– Sal, Commented Jun 12, 2014 at 1:43
Fay is; A proper subset of Haskell that compiles to JavaScript. github.com/faylang/fay/wiki — AnneTheAgile
– AnneTheAgile, Commented Sep 25, 2014 at 13:16

Justin Leitgeb · Accepted Answer · 2014-08-04 21:50:38Z

7

I just asked the ghcjs author (luite) in IRC, and he said, "there is no good way yet to directly export a library."

He does seem very interested in supporting that capability, though, so I'm hoping, and optimistic that this will change in the near future. The place to watch this issue is the ticket requesting this feature on github.

answered Aug 4, 2014 at 21:50

Justin Leitgeb

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2 Comments

Erik Kaplun Over a year ago

but what is the status of this as or 2015 Apr?

Justin Leitgeb Over a year ago

The ticket hasn't been updated since February 2015, and it's still open, so looks like it isn't done yet. ghcjs development is still very active (with commits in the last day) so I'm still optimistic on having this feature in t he future.

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