jsaddle

Interface for JavaScript that works with GHCJS and GHC

LTS Haskell 24.66:0.9.9.4
Stackage Nightly 2026-11-12:0.9.10.0
Latest on Hackage:0.9.10.0

See all snapshots jsaddle appears in

MIT licensed by Hamish Mackenzie
Maintained by Hamish Mackenzie
This version can be pinned in stack with:jsaddle-0.9.10.0@sha256:2b791ba83fb29b3e01fc818c476ddc655ac774a68e0387bc6c86e23db358fec1,4777

Module documentation for 0.9.10.0

Used by 2 packages in nightly-2026-11-12(full list with versions):
jsaddle-dom, jsaddle-warp

This package provides an EDSL for calling JavaScript that can be used both from GHCJS and GHC. When using GHC the application is run using Warp and WebSockets to drive a small JavaScript helper.

Changes

Revision history for jsaddle

0.9.10.0

  • Language.Javascript.JSaddle.Int53 (GHCJS.Int53 on native GHC, from ghcjs-base on the JavaScript backend): Int53 and Word53, integers a JavaScript Number holds exactly, used by jsaddle-dom 0.10 for Web IDL’s long long / unsigned long long. No Num instance on purpose.
  • PToJSVal, PFromJSVal, ToJSVal and FromJSVal instances for Object and SomeJSArray (JSArray, MutableJSArray), defined with the classes so they are not orphans; fromJSVal is Nothing for null and undefined. The orphan ToJSVal Object instance in Language.Javascript.JSaddle.Value is gone. Packages with their own orphan instances for these types need to drop them.
  • Requires ghcjs-base >= 0.8.1 on the JavaScript backend.
  • runJavaScriptWithSerializer: opt-in per-runner batch serialisation.
  • Batch results are queued instead of passed through a one-slot MVar.
  • aeson < 2.4.