Optimistic Kit

Generic immutable optimistic state primitives for plain data.

mosa.sh

Framework-free optimistic state primitives for plain application data. A state keeps an authoritative confirmed value, a visible projected value, and an ordered list of pending actions. Commit, rollback, and reconciliation return new state objects.

import { createOptimisticState, stageOptimistic, rollbackOptimistic } from "optimistic-kit";

const reduce = (count: number, change: number) => count + change;
let state = createOptimisticState<number, number>(0);
state = stageOptimistic(state, { id: "add-1", action: 1 }, reduce);
state.value; // 1
state = rollbackOptimistic(state, "add-1", reduce, "Request failed");
state.value; // 0

The reducer is supplied by the consuming domain; this package does not assume React, a server API, or a particular persistence layer.

Development

npm run build