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export function ensureUint8Array(buffer: ArrayLike<number> | Uint8Array | ArrayBufferView | ArrayBuffer): Uint8Array {  if (buffer instanceof Uint8Array) {    return buffer;  } else if (ArrayBuffer.isView(buffer)) {    return new Uint8Array(buffer.buffer, buffer.byteOffset, buffer.byteLength);  } else if (buffer instanceof ArrayBuffer) {    return new Uint8Array(buffer);  } else {    // ArrayLike<number>    return Uint8Array.from(buffer);  }}
export function createDataView(buffer: ArrayLike<number> | ArrayBufferView | ArrayBuffer): DataView {  if (buffer instanceof ArrayBuffer) {    return new DataView(buffer);  }
  const bufferView = ensureUint8Array(buffer);  return new DataView(bufferView.buffer, bufferView.byteOffset, bufferView.byteLength);}