How can I use GHC's Javascript backend in Github CI

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#1

The Javascript backend has been merged into the GHC repo for a while, and I also found the tutorial on how to build a simple example here: Using GHC's JavaScript Backend in the Browser | IOG Engineering But has anyone already tried to build a static site using Github actions which can be served using github pages? Building GHC itself using Github actions is probably not the way to go forward :slight_smile: , but is there some preferred way to get prebuilt binaries?

Ideally I am looking for someone who has a working Github actions configuration for building and serving a simple static website that I can copy and modify.

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Is it worth anything to start using GHCJS in 2021?
#2

May not be the latest.

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#3

fourmolu.github.io uses GHCJS. You can use Ormolu or Fourmolu’s CI as inspiration if you get stuck

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#4

It doesn’t look like it’s using GHCJS, it’s using wasm: https://github.com/fourmolu/fourmolu/blob/a769b64c80b49497be965286a0ddd6e6482c7bfc/.github/workflows/web.yml#L28

#5

🤦 sorry I’m dumb, ignore me

#6

What’s the process to update the unofficial bindist to 9.8?

#7

You just send a PR editing this file: https://github.com/haskell/ghcup-metadata/blob/f6ef3672bad8f53790f9dc26503b4d62763a6918/ghcup-cross-0.0.8.yaml#L9

You add a section like:

    javascript-unknown-ghcjs-9.8.1:
      viTags:
      - base-XXXXXX
      viArch:
        A_64:
          Linux_UnknownLinux:
            unknown_versioning:
              dlUri: <uri>/ghc-javascript-unknown-ghcjs-9.8.1-x86_64-linux-unknown.tar.xz
              dlHash: <hash>
              dlSubdir: ghc-9.8.1-javascript-unknown-ghcjs
          Darwin:
            unknown_versioning:
              dlUri: <uri>/ghc-javascript-unknown-ghcjs-9.8.1-x86_64-apple-darwin.tar.xz
              dlHash: <hash>
              dlSubdir: ghc-9.8.1-javascript-unknown-ghcjs
        A_ARM64:
          Darwin:
            unknown_versioning:
              dlUri: <uri>/ghc-javascript-unknown-ghcjs-9.8.1-aarch64-apple-darwin.tar.xz
              dlHash: <hash>
              dlSubdir: ghc-9.8.1-javascript-unknown-ghcjs

The storage should be permanent. So avoid gitlab URIs.

#8

Thanks.

The storage should be permanent. So avoid gitlab URIs.

Could we store the new bindists with the other unofficial ones?

#9

yeah…If you give me a download location, I can move them there

#10

Ok we’ll do this for the upcoming 9.8.2 release. Thanks!

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Is it worth anything to start using GHCJS in 2021?
#11

For anyone stumbling upon this in the future. I managed to find some time today to try this out. I created the following minimal project which uses GHCup’s support for crosscompilers in GitHub CI actions: GitHub - BinderDavid/ghc-javascript-ci

Since this was so easy, the next step would probably be to support the javascript crosscompiler in the official haskell setup actions: GitHub - haskell-actions/setup: Setting up GHC, cabal, stack on for Haskell-related CIs

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