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// Copyright 2018-2023 the Deno authors. All rights reserved. MIT license.// This module is browser compatible.
/** * Concatenate an array of {@linkcode Uint8Array}s. * * @example * ```ts * import { concat } from "https://deno.land/std@$STD_VERSION/bytes/concat.ts"; * * const a = new Uint8Array([0, 1, 2]); * const b = new Uint8Array([3, 4, 5]); * concat([a, b]); // Uint8Array(6) [ 0, 1, 2, 3, 4, 5 ] * ``` */export function concat(buf: Uint8Array[]): Uint8Array;/** * @deprecated (will be removed in 0.209.0) Pass in an array instead of a * spread of arguments. * * Concatenate an array of {@linkcode Uint8Array}s. * * @example * ```ts * import { concat } from "https://deno.land/std@$STD_VERSION/bytes/concat.ts"; * * const a = new Uint8Array([0, 1, 2]); * const b = new Uint8Array([3, 4, 5]); * concat(a, b); // Uint8Array(6) [ 0, 1, 2, 3, 4, 5 ] * ``` */export function concat(...buf: Uint8Array[]): Uint8Array;export function concat(...buf: (Uint8Array | Uint8Array[])[]): Uint8Array {  /**   * @todo(iuioiua): Revert to the old implementation upon removal of the   * spread signatures.   *   * @see {@link https://github.com/denoland/deno_std/blob/e6c61ba64d547b60076422bbc1f6ad33184cc10a/bytes/concat.ts}   */  // No need to concatenate if there is only one element in array or sub-array  if (buf.length === 1) {    if (!Array.isArray(buf[0])) {      return buf[0];    } else if (buf[0].length === 1) {      return buf[0][0];    }  }
  let length = 0;  for (const b of buf) {    if (Array.isArray(b)) {      for (const b1 of b) {        length += b1.length;      }    } else {      length += b.length;    }  }
  const output = new Uint8Array(length);  let index = 0;  for (const b of buf) {    if (Array.isArray(b)) {      for (const b1 of b) {        output.set(b1, index);        index += b1.length;      }    } else {      output.set(b, index);      index += b.length;    }  }
  return output;}