developit/greenlet

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

4688 stars · 97 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Greenlet is a tiny JavaScript library that takes an async function and returns a version of it that runs in its own Web Worker thread. It is a simplified single-function variant of workerize, with performance comparable to direct Worker usage.

Use cases

• run a cpu-heavy async function off the main thread
• move an async function into a web worker without writing worker boilerplate
• fetch network resources in a background thread and return only needed data
• offload expensive computation from the browser ui thread
• use transferable objects efficiently between threads

When to choose

• you need a single self-contained function to run off the main thread
• you want minimal bundle size and zero worker scaffolding
• your function has small inputs and outputs and doesn't need shared scope

When to avoid

• you need multiple functions or shared state in a worker (use workerize)
• your function depends on its surrounding closure scope
• you need active maintenance or guaranteed long-term support
• you need Node.js support without polyfilling Web Workers

Facets

library · maturity maintenance

concurrency developer-tools web-development developer-tools performance browser cross-platform web-workers async threads off-main-thread micro-library nodejs

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