greenlet

Greenlet

Move an async function into its own thread.

A simplified single-function version of workerize.

The name is somewhat of a poor choice, but it was available on npm.

Greenlet only supports browser environments, since it uses Web Workers. For use in a NodeJS environment, Web Workers must be polyfilled using a library like node-webworker.

Installation & Usage

npm i -S greenlet

Accepts an async function with, produces a copy of it that runs within a Web Worker.

⚠️ Caveat: the function you pass cannot rely on its surrounding scope, since it is executed in an isolated context.

greenlet(Function) -> Function

Example

Greenlet is most effective when the work being done has relatively small inputs/outputs.

One such example would be fetching a network resource when only a subset of the resulting information is needed:

import greenlet from 'greenlet'

let getName = greenlet( async username => {
    let url = `https://api.github.com/users/${username}`
    let res = await fetch(url)
    let profile = await res.json()
    return profile.name
})

console.log(await getName('developit'))

License

MIT