@polkadot/util/is/buffer.js

// Copyright 2017-2022 @polkadot/util authors & contributors
// SPDX-License-Identifier: Apache-2.0
import { hasBuffer } from "../has.js";
import { isFunction } from "./function.js";
/**
 * @name isBuffer
 * @summary Tests for a `Buffer` object instance.
 * @description
 * Checks to see if the input object is an instance of `Buffer`.
 * @example
 * <BR>
 *
 * ```javascript
 * import { isBuffer } from '@polkadot/util';
 *
 * console.log('isBuffer', isBuffer(Buffer.from([]))); // => true
 * ```
 */

export function isBuffer(value) {
  // we do check a function first, since it is slightly faster than isBuffer itself
  return hasBuffer && isFunction(value && value.readDoubleLE) && Buffer.isBuffer(value);
}