@restate/core/build/cjs/create-selector-hook.js

_Restate_ is a predictable, easy to use, easy to integrate, typesafe state container for [React](https://reactjs.org/).

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);
var create_selector_hook_exports = {};
__export(create_selector_hook_exports, {
  createSelectorHook: () => createSelectorHook
});
module.exports = __toCommonJS(create_selector_hook_exports);
var import_react = require("react");
var import_rxjs = require("rxjs");
var import_operators = require("rxjs/operators");
const identitySelectorFunction = (state) => state;
function createSelectorHook(context, outerSelector = identitySelectorFunction) {
  function useAppState(selector, props) {
    const _store = (0, import_react.useContext)(context);
    const _props = {
      deps: [],
      compare: void 0,
      ...props
    };
    const state = _store.state;
    const deps = _props.deps;
    const startValue = (0, import_react.useMemo)(
      () => getSelectedValue(state, outerSelector, selector),
      [...deps]
    );
    const [value, setValue] = (0, import_react.useState)(startValue);
    const output$ = (0, import_react.useMemo)(() => {
      return new import_rxjs.BehaviorSubject(startValue);
    }, [state]);
    (0, import_react.useEffect)(() => {
      const stateSub = _store.state$.subscribe((nextStateValue) => {
        const nextValue = getSelectedValue(
          nextStateValue.state,
          outerSelector,
          selector
        );
        output$.next(nextValue);
      });
      const outputSub = output$.pipe((0, import_operators.distinctUntilChanged)()).subscribe((nextStateValue) => setValue(nextStateValue));
      return function cleanup() {
        stateSub.unsubscribe();
        outputSub.unsubscribe();
      };
    }, [output$, ...deps]);
    return value;
  }
  return useAppState;
}
function getSelectedValue(state, outerSelector, selector) {
  const subState = outerSelector(state);
  const value = selector(subState);
  return value;
}