react-hook-merge-state/lib/hooks/use-merge-state.js

在`useState`的基础上，对同一个状态的默认值、受控值进行对比监听

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t.return && (u = t.return(), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
import { isFunction } from "../shared/is-function";
import isEqual from 'fast-deep-equal';
import { useState, useCallback, useRef } from 'react';
/**
 * 合并状态值
 */
export function useMergeState(defaultStateValue, option) {
  var _ref = option || {},
    defaultValue = _ref.defaultValue,
    value = _ref.value,
    onChange = _ref.onChange,
    transformToResult = _ref.transformToResult,
    transformToOrigin = _ref.transformToOrigin,
    compare = _ref.compare;
  var compareRef = useRef(isFunction(compare) ? compare : isEqual);
  var _useState = useState(function () {
      if (value !== undefined) {
        return value;
      }
      if (defaultValue !== undefined) {
        return isFunction(defaultValue) ? defaultValue() : defaultValue;
      }
      return isFunction(defaultStateValue) ? defaultStateValue() : defaultStateValue;
    }),
    _useState2 = _slicedToArray(_useState, 2),
    innerValue = _useState2[0],
    setInnerValue = _useState2[1];
  var mergedValue = value !== undefined ? value : innerValue;
  var parseToResult = useCallback(function (value) {
    if (isFunction(transformToResult)) {
      return transformToResult(value);
    }
    return value;
  }, [transformToResult]);
  var parseToOrigin = useCallback(function (value) {
    if (isFunction(transformToOrigin)) {
      return transformToOrigin(value);
    }
    return value;
  }, [transformToOrigin]);
  function triggerChange(newValue) {
    var resultValue = parseToOrigin(newValue);
    setInnerValue(resultValue);
    if (onChange) {
      var _compareRef$current;
      var isEq = (_compareRef$current = compareRef.current) === null || _compareRef$current === void 0 ? void 0 : _compareRef$current.call(compareRef, mergedValue, resultValue);
      if (!isEq) {
        for (var _len = arguments.length, args = new Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
          args[_key - 1] = arguments[_key];
        }
        onChange.apply(void 0, [resultValue, mergedValue].concat(args));
      }
    }
  }
  return [parseToResult(mergedValue), triggerChange];
}