'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var React = require('react');

var updateRef = function updateRef(ref, value) {
  if (typeof ref === 'function') {
    ref(value);
    return;
  }
  ref.current = value;
};

var useComposedRef = function useComposedRef(libRef, userRef) {
  var prevUserRef = React.useRef();
  return React.useCallback(function (instance) {
    libRef.current = instance;

    if (prevUserRef.current) {
      updateRef(prevUserRef.current, null);
    }

    prevUserRef.current = userRef;

    if (!userRef) {
      return;
    }

    updateRef(userRef, instance);
  }, [userRef]);
};

exports.default = useComposedRef;