callbag/callbag

Health v2 · maintenance only

Flags: no_releases no_license

Adoption not part of the score

1575 stars · 39 forks observed · 2026-08-28

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

Callbag is a lightweight specification/standard for JavaScript callbacks that enables minimal-overhead observables, iterables, and async iterables. It is intentionally not a library but a protocol definition (source/sink handshake, data delivery, and termination semantics) on which modular reactive utility packages can be built.

Use cases

• implement lightweight observables in javascript
• standard for reactive streams with minimal memory allocations
• build modular stream operators as separate npm packages
• unify observables and async iterables under one callback protocol
• create custom reactive data sources and sinks
• learn how callback-based stream protocols work

When to choose

• you want a tiny, dependency-free reactive streams standard with minimal overhead
• you need interoperability across callbag-based operator packages like callbag-basics
• you prefer composing your own reactive toolkit from small modular pieces
• you want one protocol covering observables, iterables, and async iterables

When to avoid

• you need a batteries-included reactive library with rich operators out of the box
• you want extensive documentation, types, and community support like RxJS provides
• your team prefers established standards such as TC39 observable proposals or WHATWG streams
• you need guaranteed long-term maintenance, as the spec sees infrequent updates

Facets

library · maturity stable

streaming concurrency developer-tools web-development developer-tools frontend backend browser cross-platform reactive-programming observables iterables async-iterables protocol-specification callback-standard functional-reactive nodejs

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