flimsy
A single-file <1kb simplified reactive core inspired by Solid, optimized for clean code and learning.
What is flimsy?
Flimsy is a minimal, single-file implementation of the reactive core from Solid.js, designed to be under 1kb min+gzip. It provides essential reactivity primitives like signals, effects, and memos in a simplified, educational package. The project solves the need for a clean, understandable codebase to learn how fine-grained reactivity systems work.
Developers and learners interested in understanding the internals of reactive programming libraries, particularly those curious about Solid.js's reactivity model or building custom reactive systems.
Developers choose Flimsy for its extreme simplicity and educational focus—it strips away performance optimizations to present a clear, annotated implementation of reactivity fundamentals. Unlike full-fledged frameworks, it serves as a lightweight tool for experimentation and learning.
Overview
A single-file <1kb min+gzip simplified implementation of the reactive core of Solid, optimized for clean code.
Use Cases
Best For
- Learning how Solid.js's reactivity system works internally
- Experimenting with fine-grained reactive programming concepts
- Building custom lightweight reactive libraries or prototypes
- Understanding signal-based state management patterns
- Educational projects or workshops on modern frontend reactivity
- Creating isomorphic reactive utilities without framework overhead
Not Ideal For
- Production applications requiring optimized performance and stability
- Projects needing a full UI framework with components, routing, and tooling
- Teams dependent on mature ecosystems and extensive community support
- Applications where bug-free code is critical, such as financial or healthcare systems
Pros & Cons
Pros
At under 1kb min+gzip, Flimsy is exceptionally small and easy to integrate, as emphasized in the README, making it ideal for learning without overhead.
The annotated source code provides clear insights into reactivity internals, prioritizing readability over performance for effective learning.
Implements core functions like createSignal and createEffect with semantics similar to Solid.js, reducing the learning curve for those familiar with modern reactivity.
Works consistently in both browser and server environments, unlike Solid's default server behavior which requires explicit configuration, as noted in the README.
Cons
Only implements a subset of Solid's functions, and lacks features like scheduled effects or Provider components for context, limiting its utility for complex applications.
The README explicitly states it optimizes for clean code over performance and memory usage, making it inefficient for high-demand scenarios.
Admitted to be 'buggier' than Solid in the README, reducing reliability for production use or critical systems.
Frequently Asked Questions
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