/**
 * Concats typed arrays
 * @param arrays
 * @returns new Uint8Array
 */
export function concatTypedArrays(arrays: any = []): Uint8Array {
  let byteLength = 0;
  for (let i = 0; i < arrays.length; ++i) {
    byteLength += arrays[i].byteLength;
  }
  const buffer = new Uint8Array(byteLength);

  let byteOffset = 0;
  for (let i = 0; i < arrays.length; ++i) {
    const data = new Uint8Array(arrays[i].buffer);
    byteLength = data.length;
    for (let j = 0; j < byteLength; ++j) {
      buffer[byteOffset++] = data[j];
    }
  }
  return buffer;
}