channelstate/dist/vanilla.mjs

A lightweight cross-context state management library built on the BroadcastChannel API.

function createStore(initialState) {
  let state = initialState;
  const listeners = /* @__PURE__ */ new Set();
  const setState = (nextState, replace) => {
    if (!Object.is(nextState, state)) {
      const preState = state;
      state = replace ?? (typeof nextState !== "object" || nextState === null) ? nextState : Object.assign({}, state, nextState);
      for (const listener of listeners) {
        listener(state, preState);
      }
    }
  };
  const getState = () => state;
  const getInitialState = () => initialState;
  const subscribe = (listener) => {
    listeners.add(listener);
    return () => listeners.delete(listener);
  };
  return { getState, getInitialState, setState, subscribe };
}

export { createStore };