/**
 *  Copyright (c) 2021 GraphQL Contributors
 *  All rights reserved.
 *
 *  This source code is licensed under the license found in the
 *  LICENSE file in the root directory of this source tree.
 *
 */

/* eslint-disable no-bitwise */
export default function stringToHash(str: string): number {
  let hash = 0;
  if (str.length === 0) {
    return hash;
  }
  for (let i = 0; i < str.length; i++) {
    const chr = str.charCodeAt(i);
    hash = (hash << 5) - hash + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash;
}