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Initial commit of jsaddle-run.
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‎.github/workflows/main.yml‎

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name: jsaddle-run CI
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on:
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push:
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branches:
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- master
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pull_request:
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env:
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ACTIONS_ALLOW_UNSECURE_COMMANDS: true
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jobs:
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build:
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runs-on: ubuntu-latest
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if: github.ref != 'refs/heads/master'
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steps:
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- uses: DeterminateSystems/nix-installer-action@main
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- uses: actions/[email protected]
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- uses: cachix/install-nix-action@v25
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with:
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nix_path: nixpkgs=channel:nixpkgs-unstable
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- name: Cancel Previous Runs
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uses: styfle/[email protected]
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with:
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access_token: ${{ github.token }}
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- uses: cachix/cachix-action@v16
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with:
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name: haskell-miso-cachix
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authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
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- name: Nix channel update
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run: nix-channel --update
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- name: Build
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run: nix-build

‎.gitignore‎

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*~

‎CHANGELOG.md‎

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# Revision history for jsaddle-run
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## 0.1.0.0 -- YYYY-mm-dd
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* First version. Released on an unsuspecting world.

‎LICENSE‎

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Copyright (c) 2016-2025, David M. Johnson
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
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3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

‎README.md‎

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jsaddle-run
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===================
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An abstraction over jsaddle for various backends (GHCJS, WASM, GHC)
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Abstracts over:
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- [jsaddle-wasm](https://github.com/amesgen/jsaddle-wasm)
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- [jsaddle-warp](https://hackage.haskell.org/package/jsaddle-warp)
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### Dev
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```nix-shell
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$ nix-shell
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```
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### Build
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```nix-shell
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$ nix-build
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```
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### Usage
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```haskell
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module Main where
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import Language.Javascript.JSaddle (run)
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main :: IO ()
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main = run code
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code :: JSM ()
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code = undefined -- your code goes here
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```
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‎default.nix‎

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with (builtins.fromJSON (builtins.readFile ./nixpkgs.json));
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{ nixpkgs ? builtins.fetchTarball {
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url = "https://github.com/NixOS/nixpkgs/archive/${rev}.tar.gz";
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inherit sha256;
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}
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}:
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let
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pkgs = import nixpkgs {};
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source = {
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jsaddle = pkgs.fetchFromGitHub {
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owner = "ghcjs";
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repo = "jsaddle";
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rev = "2513cd19184376ac8a2f0e3797a1ae7d2e522e87";
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hash = "sha256-xJ3BLiFtQmH92Y0jqIgdzJqidQHm3M1ZKHRAUEgNZF0=";
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};
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jsaddle-run = ./.;
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};
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overrides = self: super: with pkgs.haskell.lib; {
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jsaddle-run =
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self.callCabal2nix "jsaddle-run" source.jsaddle-run {};
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jsaddle =
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self.callCabal2nix "jsaddle" "${source.jsaddle}/jsaddle" {};
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jsaddle-warp =
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dontCheck (self.callCabal2nix "jsaddle-warp" "${source.jsaddle}/jsaddle-warp" {});
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};
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hPkgs =
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pkgs.haskellPackages.override { inherit overrides; };
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in
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{
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inherit (hPkgs) jsaddle-run;
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}

‎jsaddle-run.cabal‎

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cabal-version: 2.2
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name: jsaddle-run
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version: 0.1.0.0
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synopsis: Abstraction over various jsaddle backends
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description: Transparently execute JSM in either WASM, GHCJS and GHC
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homepage: https://github.com/haskell-miso/jsaddle-run
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license: BSD-3-Clause
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license-file: LICENSE
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author: dmjio
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maintainer: [email protected]
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copyright: dmjio @ 2025
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category: Web
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build-type: Simple
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extra-doc-files: CHANGELOG.md
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common cpp
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if impl(ghcjs) || arch(javascript)
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cpp-options:
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-DGHCJS_BOTH
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if impl(ghcjs)
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cpp-options:
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-DGHCJS_OLD
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elif arch(javascript)
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cpp-options:
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-DGHCJS_NEW
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elif arch(wasm32)
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cpp-options:
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-DWASM
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else
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cpp-options:
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-DNATIVE
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common jsaddle
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if !(impl(ghcjs) || arch(javascript) || arch(wasm32))
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build-depends:
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jsaddle-warp < 0.10
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if !(impl(ghcjs) || arch(javascript))
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build-depends:
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file-embed < 0.1
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if arch(wasm32)
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build-depends:
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jsaddle-wasm >= 0.1.2 && < 0.2
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library
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imports:
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cpp, jsaddle
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exposed-modules:
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Language.Javascript.JSaddle.Run
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build-depends:
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base, jsaddle
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hs-source-dirs:
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src
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default-language:
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Haskell2010

‎nixpkgs.json‎

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{
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"rev" : "b594b289740a2bc917ed9c66fef5d905f389cb96",
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"sha256" : "sha256:1p25582cbrjlqv4kr64481m776vgppgxghinrdjpfjglkjj3aw2w"
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}

‎shell.nix‎

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(import ./default.nix {}).env

‎src/Language/Javascript/JSaddle/Run.hs‎

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-----------------------------------------------------------------------------
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{-# LANGUAGE CPP #-}
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{-# LANGUAGE OverloadedStrings #-}
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-----------------------------------------------------------------------------
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-- |
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-- Module : Language.Javascript.JSaddle.Run
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-- Copyright : (C) 2016-2025 David M. Johnson
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-- License : BSD3-style (see the file LICENSE)
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-- Maintainer : David M. Johnson <[email protected]>
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-- Stability : experimental
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-- Portability : non-portable
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----------------------------------------------------------------------------
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module Language.Javascript.JSaddle.Run
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( -- ** Execution
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run
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) where
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-----------------------------------------------------------------------------
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#ifdef WASM
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import qualified Language.Javascript.JSaddle.Wasm as J
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#elif !GHCJS_BOTH
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import Data.Maybe
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import System.Environment
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import Text.Read
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import qualified Language.Javascript.JSaddle.Warp as J
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#endif
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import Language.Javascript.JSaddle
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-----------------------------------------------------------------------------
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-- | When compiling with jsaddle on native platforms
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-- 'run' will start a web server for live reload
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-- of your application.
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--
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-- When compiling to WASM this will use 'jsaddle-wasm'.
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-- When compiling to JS (via jsaddle-warp) no special package is
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-- required (simply the 'id' function). JSM becomes a type synonym for IO.
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run :: JSM () -> IO ()
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#ifdef WASM
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run = J.run
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#elif GHCJS_BOTH
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run = id
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#else
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run action = do
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port <- fromMaybe 8008 . (readMaybe =<<) <$> lookupEnv "PORT"
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isGhci <- (== "<interactive>") <$> getProgName
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putStrLn $ "Running on port " <> show port <> "..."
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(if isGhci then J.debug else J.run) port action
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#endif
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-----------------------------------------------------------------------------

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