bucklescript compiler plugin for rollup.js

works with both ReasonML and OCaml

First install bs-platform in your project

npm i -D bs-platform

create a bsconfig.json for Bucklescript in the root directory of your project

and remember to specify "package-specs" as ["es6"], so that rollup can consume it.

{
  "name": "hello",
  "sources": ["src"],
  "bs-dependencies": ["reason-react"],
  "reason": {
    "react-jsx": 2
  },
  "package-specs": ["es6"],
  "refmt": 3
}

Finally, install rollup-plugin-bucklescript

npm i -D rollup-plugin-bucklescript

and add it to your rollup config.

import bucklescript from 'rollup-plugin-bucklescript'
export default {
  input: 'src/main.re',
  output: {
    file: 'dist/main.js',
    format: 'cjs',
  },
  plugins: [
    bucklescript()
  ],
}

All the settings are taken from bsconfig.json, but few options can be overridden.

each a minimatch pattern, or array of minimatch patterns, which determines which files are complied by Bucklescript. By default all .re and .ml are included and all .rei and .mli are excluded.

To specify bucklescript output type for rollup to consume.

Note: Please check the Caveats section

...
plugins: [
  bucklescript({
    module: 'es6'
  })
]

To use bs-loader with bsb's in-souce builds, add the inSource option to your loader config:

...
plugins: [
  bucklescript({
    inSource: false
  })
]

This option specifies what directory to run bsb from.

...
plugins: [
  bucklescript({
    cwd: 'path/to/dir'
  })
]

Controls whether bsb compile warnings are shown. Defaults to true.

...
plugins: [
  bucklescript({
    showWarnings: true
  })
]

Note: This is an advance feature and may not work as intended Bucklescript comes with OCaml standard library complied to javascript. Choose whether to bundle functions from standard library. Defaults to true.

Check the examples folder in the github repo.

Please use es6 for module option as rollup works only with es modules. But this breaks integration with with react, thought it can be easily solved by following the helpful error message provided by rollup.

or check the react example folder.

• bs-loader - A webpack plugin for bucklescript, for providing bsb-js and read-bsconfig.
• Reason team at facebook and all the project contributors for making ReasonML
• @bobzhang and all contributors of bucklescript.

MIT