@react-aria/utils/src/getOffset.ts

/*
 * Copyright 2020 Adobe. All rights reserved.
 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

export function getOffset(element, reverse, orientation = 'horizontal') {
  let rect = element.getBoundingClientRect();
  if (reverse) {
    return orientation === 'horizontal' ? rect.right : rect.bottom;
  }
  return orientation === 'horizontal' ? rect.left : rect.top;
}