react-multi-ref/js/index.js

Utility for keeping references to multiple React elements.

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;
var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));
var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));
var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));
function _classPrivateFieldInitSpec(obj, privateMap, value) { _checkPrivateRedeclaration(obj, privateMap); privateMap.set(obj, value); }
function _checkPrivateRedeclaration(obj, privateCollection) { if (privateCollection.has(obj)) { throw new TypeError("Cannot initialize the same private elements twice on an object"); } }
function _classPrivateFieldGet(s, a) { return s.get(_assertClassBrand(s, a)); }
function _assertClassBrand(e, t, n) { if ("function" == typeof e ? e === t : e.has(t)) return arguments.length < 3 ? t : n; throw new TypeError("Private element is not present on this object"); }
var _refFns = /*#__PURE__*/new WeakMap();
var MultiRef = exports["default"] = /*#__PURE__*/function () {
  function MultiRef() {
    (0, _classCallCheck2["default"])(this, MultiRef);
    (0, _defineProperty2["default"])(this, "map", new Map());
    _classPrivateFieldInitSpec(this, _refFns, new Map());
  }
  return (0, _createClass2["default"])(MultiRef, [{
    key: "ref",
    value: function ref(key) {
      var _this = this;
      var refFn = _classPrivateFieldGet(_refFns, this).get(key);
      if (refFn) {
        return refFn;
      } else {
        var _refFn = function _refFn(value) {
          if (value == null) {
            // Support for React <=18, which cleans up ref functions by calling them
            // with null.
            _classPrivateFieldGet(_refFns, _this)["delete"](key);
            _this.map["delete"](key);
          } else {
            _classPrivateFieldGet(_refFns, _this).set(key, _refFn);
            _this.map.set(key, value);
            // React 19+ cleanup support
            return function () {
              _classPrivateFieldGet(_refFns, _this)["delete"](key);
              _this.map["delete"](key);
            };
          }
        };
        // We don't put `refFn` into `this._refFns` yet, because if the current render
        // is aborted, then it's possible than `refFn(null)` won't be called later
        // and its cleanup will never happen. We shouldn't cause any side effects that
        // need cleaning up later until `refFn` gets called with a non-null value.
        return _refFn;
      }
    }
  }]);
}();
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