monolite

Type-safe structural-sharing tree modifier.

Install

yarn add monolite

Babel Plugin

Monolite by default makes usage of ES2015 Proxy, which permits to transform accessor functions to accessor chains.

// Using accessor function
set(state, (_) => _.nested.prop, 42)
 
// Using accessor chain
set(state, ['nested', 'prop'], 42)

To target older runtimes, which do not support Proxy, a Babel plugin is available, doing these transformations statically, at compile-time.

Setup

yarn add --dev babel-plugin-monolite

In babel.config.js, simply add:

module.exports = (api) => {
  return {
    presets: [
      // ...
    ],
    plugins: ['babel-plugin-monolite'],
  }
}

Voilà, all your accessor functions will be transformed to accessor chains during transpilation.

TypeScript

The main motivation of this library is to preserve static-typing, type-inference and completion provided by TypeScript, which is not supported by Immutable.js when working on trees.

Monolite takes Plain-Old JavaScript Objects and returns Plain-Old JavaScript Objects. Accessors permit TypeScript to understand the types you're dealing with and to provide completion and linting as if you were working directly on these objects.