@rc-component/util/lib/hooks/useMemo.js

Common Utils For React Component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = useMemo;
var React = _interopRequireWildcard(require("react"));
function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (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 && Object.prototype.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 useMemo(getValue, condition, shouldUpdate) {
  const cacheRef = React.useRef({});
  if (!('value' in cacheRef.current) || shouldUpdate(cacheRef.current.condition, condition)) {
    cacheRef.current.value = getValue();
    cacheRef.current.condition = condition;
  }
  return cacheRef.current.value;
}