SolidJS

SolidJS looks like React but has no Virtual DOM. It compiles to direct DOM updates using fine-grained reactivity (Signals). 2025 focuses on SolidStart (meta-framework).

When to Use

• Performance: Consistently tops benchmarks.
• Real-time: Fine-grained updates make it ideal for dashboards.
• Mental Model: If you prefer "it only runs once" components vs React's re-renders.

Core Concepts

Signals (createSignal)

The atom of state. const [count, setCount] = createSignal(0).

Effects (createEffect)

Runs when dependencies change. Automatic dependency tracking.

Show / For

Control flow components (<Show when={...}>) instead of map.

Best Practices (2025)

Do:

• Use createResource: For async data fetching.
• Access signals as functions: count() not count.
• Use SolidStart: For file-system routing and SSR.

Don't:

• Don't destructure props: Reactivity is lost if you destructure props.

References

• SolidJS Documentation