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High performance mutable data framework.




Reactive Data Client

CircleCI Coverage Status npm downloads bundle size npm version PRs Welcome

Reducer/flux normalized, framework-agnostic data store. Includes managers/middleware, global referential equality guarantees, automatic expiry policies, data normalization. Consumes TypeScript Standard Endpoints

📖Read The Docs  |  🏁Getting Started  |  🎮Todo Demo  |  🎮Github Demo

Framework Implementations

Sample React Hook suspense implementation

function useSuspense(endpoint, ...args)
  const state = useCacheState();
  const controller = useController();

  const key = args[0] !== null ? endpoint.key(...args) : '';
  const cacheResults = key && state.endpoints[key];
  const meta = state.meta[key];

  // Compute denormalized value
  const { data, expiryStatus, expiresAt } = useMemo(() => {
    return controller.getResponse(endpoint, ...args, state);
  }, [

  const error = controller.getError(endpoint, ...args, state);

  // If we are hard invalid we must fetch regardless of triggering or staleness
  const forceFetch = expiryStatus === ExpiryStatus.Invalid;

  const maybePromise = useMemo(() => {
    // null params mean don't do anything
    if (( <= expiresAt && !forceFetch) || !key) return;

    return controller.fetch(endpoint, ...args);
    // we need to check against serialized params, since params can change frequently
  }, [expiresAt, controller, key, forceFetch, state.lastReset]);

  // fully "valid" data will not suspend even if it is not fresh
  if (expiryStatus !== ExpiryStatus.Valid && maybePromise) {
    throw maybePromise;

  if (error) throw error;

  return data;