zarm/lib/utils/hooks/useSafeState/index.js

基于 React 的移动端UI库

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

var _typeof = require("@babel/runtime/helpers/typeof");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));

var React = _interopRequireWildcard(require("react"));

function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(e) { return e ? t : r; })(e); }

function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != _typeof(e) && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) { if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } } return n.default = e, t && t.set(e, n), n; }

function useSafeState(initialState) {
  var _React$useState = React.useState(initialState),
      _React$useState2 = (0, _slicedToArray2.default)(_React$useState, 2),
      state = _React$useState2[0],
      setState = _React$useState2[1];

  var mounted = React.useRef(false);
  React.useEffect(function () {
    mounted.current = true;
    return function () {
      mounted.current = false;
    };
  }, []);
  var update = React.useCallback(function (nextState) {
    mounted.current && setState(nextState);
  }, []);
  return [state, update];
}

var _default = useSafeState;
exports.default = _default;