cloudhubui/dist/utils/composeRefs.js

Various components to use in react projects

"use strict";

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

function composeRefs() {
  for (var _len = arguments.length, refs = new Array(_len), _key = 0; _key < _len; _key++) {
    refs[_key] = arguments[_key];
  }

  if (refs.length === 2) {
    // micro-optimize the hot path
    return composeTwoRefs(refs[0], refs[1]);
  }

  return refs.slice(1).reduce(function (semiCombinedRef, refToInclude) {
    return composeTwoRefs(semiCombinedRef, refToInclude);
  }, refs[0]);
}

var composedRefCache = new WeakMap();

function composeTwoRefs(ref1, ref2) {
  if (ref1 && ref2) {
    var ref1Cache = composedRefCache.get(ref1) || new WeakMap();
    composedRefCache.set(ref1, ref1Cache);

    var composedRef = ref1Cache.get(ref2) || function (instance) {
      updateRef(ref1, instance);
      updateRef(ref2, instance);
    };

    ref1Cache.set(ref2, composedRef);
    return composedRef;
  }

  if (!ref1) {
    return ref2;
  }

  return ref1;
}

function updateRef(ref, instance) {
  if (typeof ref === 'function') {
    ref(instance);
  } else {
    ref.current = instance;
  }
}