YuzuJS/setImmediate

Health v2 · maintenance only

Adoption not part of the score

1302 stars · 106 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A cross-browser JavaScript library implementing the proposed setImmediate and clearImmediate APIs for efficient script yielding to the event loop. It uses environment-specific tricks (MessageChannel, postMessage, process.nextTick) with a setTimeout fallback so it works everywhere.

Use cases

• yield to the browser event loop more efficiently than setTimeout(fn, 0)
• polyfill setImmediate in older browsers and Node versions
• schedule macrotask callbacks that let I/O and rendering happen between tasks
• avoid long-running script blocking in IE6+ and legacy browsers
• queue tasks in web workers

When to choose

• you need macrotask semantics (yield to event loop) rather than microtask semantics
• you must support very old browsers or Node versions lacking native setImmediate
• you want a small, dependency-free shim with a safe setTimeout fallback

When to avoid

• you only need microtask ordering — use Promise or asap instead
• you want render-loop-aligned scheduling — use requestAnimationFrame
• your target environments all have native setImmediate already

Facets

library · maturity maintenance

concurrency developer-tools web-development frontend developer-tools browser cross-platform setimmediate polyfill shim event-loop macrotask async nodejs

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