"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useStateSelector = useStateSelector;
var _operators = require("rxjs/operators");
var _react = require("react");
var _useObservable = _interopRequireDefault(require("react-use/lib/useObservable"));
/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */

function useStateSelector(state$, selector, equalityFn) {
  const memoizedObservable = (0, _react.useMemo)(() => state$.pipe((0, _operators.map)(selector), (0, _operators.distinctUntilChanged)(equalityFn)), [state$, selector, equalityFn]);
  const defaultValue = (0, _react.useMemo)(() => selector(state$.value), [selector, state$]);
  return (0, _useObservable.default)(memoizedObservable, defaultValue);
}