Simple and fast state management library.

The library supports TypeScript and ReScript (it is actually written in ReScript for improved type safety and performance).

Check the website for documentation and examples.

Simple documentation on the README.

• 2025-09-09 3.0.0
  • Rename unwrap for lift, change syntax for signal to expose setter.
  • Protect tilia from exceptions in computed: the exception is caught, logged to console.error and re-thrown at the end of the next flush.
  • Add leaf to @tilia/react: a higher order component to close the observing phase at the exact end of the render.
  • Simplify useComputed in @tilia/react to return the value directly.
• 2025-08-08 2.2.0
  • Add unwrap to ease inserting a signal into a tilia object.
• 2025-08-08 2.1.1
  • Fix source type: ignore return value for easier async support.
• 2025-08-03 2.1.0
  • Add derived to compute a signal from other tilia values.
  • Add watch to separate the capture phase and the effect phase of observe.
• 2025-07-24 2.0.1
  • Fix package.json configuration in @tilia/react publish script.
• 2025-07-21 2.0.0
  • Add tests and examples with Gherkin for todo app.
  • Moved core to npm "tilia" package.
  • Changed make signature to build tilia context (provides the full API running in a separate context).
  • Enable forest mode to observve across separated objects.
  • Add computed to compute values in branches (moved into tilia context).
  • Moved observe into tilia context.
  • observe will be called for its own mutations (this is to allow state machines).
  • Removed re-exports in @tilia/react.
  • Removed compute (replaced by computed).
  • Removed track as this cannot scale to multiple instances and computed.
  • Renamed internal _connect to _observe.
  • Reworked API to ensure strong typing and avoid runtime errors.
  • Add source, readonly and signal for FRP style programming.
  • Add carve to support derivation (build domain features from objects).
  • Improved flush strategy to trigger immediately but not in an observing function.
• 2025-05-05 1.6.0
  • Add compute method to cache values on read.
• 2025-01-17 1.4.0
  • Add track method to observe branches.
  • Add flush strategy for tracking notification.
• 2025-01-02 1.3.2 Fix extension in built artifacts.
• 2024-12-31 1.3.0
  • Expose internals with _meta.
  • Rewrite tracking to fix memory leaks when _ready and clear are never called.
• 2024-12-27 1.2.4 Add support for ready after clear.
• 2024-12-24 1.2.3 Rewrite tracking to fix notify and clear before ready.
• 2024-12-18 1.2.2 Fix readonly tracking: should not proxy.
• 2024-12-18 1.2.1 Fix bug to not track prototype methods.
• 2024-12-18 1.2.0 Improve ownKeys watching, notify on key deletion.
• 2024-12-18 1.1.1 Fix build issue (rescript was still required)
• 2024-12-17 1.1.0 Add support to share tracking between branches.
• 2024-12-13 1.0.0 Alpha release.