purs-loader

> PureScript loader for webpack

- Supports hot-reloading and rebuilding of single source files
- Dead code elimination using the bundle option
- Colorized build output using purescript-psa and the psc: "psa" option

Install

Install with npm.

``
npm install purs-loader --save-dev
`

Example

`javascript
const webpackConfig = {
// ...
loaders: [
// ...
{
test: /\.purs$/,
loader: 'purs-loader',
exclude: /node_modules/,
query: {
spago: true,
pscIde: true,
src: ['src/*/.purs']
}
}
// ...
]
// ...
}
`

Refer to the purescript-webpack-example for a more detailed example.

$3

Default options:

`javascript
const loaderConfig = {
psc: null, // purs compile
pscArgs: {},
pscBundle: null, // purs bundle
pscBundleArgs: {},
pscIde: false, // instant rebuilds using psc-ide-server (experimental)
pscIdeClient: null, // purs ide client
pscIdeClientArgs: {}, // for example, to use different port {port: 4088}
pscIdeServer: null, // purs ide server
pscIdeServerArgs: {}, // for example, to change the port {port: 4088}
pscIdeRebuildArgs: {}, // for example, for sourcemaps {codegen: ['js', 'sourcemaps']}
pscIdeColors: false, // defaults to true if psc === 'psa'
pscPackage: false, // include dependencies from psc-package
spago: false, // include dependencies from spago
bundleOutput: 'output/bundle.js',
bundleNamespace: 'PS',
bundle: false,
warnings: true,
watch: false, // indicates if webpack is in watch mode
output: 'output',
src: [
path.join('src', '*', '.purs'),
// if pscPackage = true
// source paths reported by psc-package sources
// if spago = true
// source paths reported by spago sources
// if pscPackage = false and spago = false
path.join('bower_components', 'purescript-', 'src', '', '.purs')
]
}
`

$3

Experimental support for instant rebuilds using psc-ide-server can be enabled
via the pscIde: true option.
You can use an already running psc-ide-server instance by specifying the port in pscIdeArgs,
if there is no server running this loader will start one for you.

$3

Set pscPackage query parameter to true to enable psc-package support. The psc-package-supplied source paths
will be appended to src parameter.

$3

Set spago query parameter to true to enable spago support. The spago-supplied source paths
will be appended to src parameter.

$3

#### Slower webpack startup after enabling psc-ide support?

By default, the psc-ide-server will be passed the globs from query.src, this is
helpful for other tools using psc-ide-server (for example IDE plugins), however
it might result in a slower initial webpack startup time (rebuilds are not
affected). To override the default behaviour, add:
pscIdeServerArgs: { "_": ['your/*globs/here'] } to the loader config

#### Errors not being displayed in watch mode?

When the watch option is set to true, psc errors are appended to
webpack's compilation instance errors array and not passed back as an
error to the loader's callback. This may result in the error not being
reported by webpack. To display errors, the following plugin may be added
to the webpack config.

`javascript
const webpackConfig = {
// ...
plugins: [
function(){
this.plugin('done', function(stats){
process.stderr.write(stats.toString('errors-only'));
});
}
]
// ...
}
`

#### Error spawn ENOENT

This is caused when the loader tries to spawn a binary that does not exists
(file or directory not found). If you call webpack like webpack or
webpack --watch, then ensure that all required binaries that the
loader depends on are available in your $PATH.

If you run webpack through an npm script (e.g., npm run or npm start) on NixOS,
then it will first attempt to find binaries in node_packages/.bin.
If you have the compiler installed through npm and it finds it there, this will
cause ENOENTon Nix, because the binary needs to be patched first, but npm will
install the binary that is linked with /lib64/ld-linux-x86-64.so.2 - a file that
will not exist at that path in NixOS.
The solution is to simply use the compiler from haskellPackages.purescript and
make sure that it's available in $PATH`. For more information about how to make
it work on Nix, see Purescript Webpack Example