How to use the token-types.UINT64_LE function in token-types

private static parseQWordAttr(buf: Buffer, offset: number = 0): number {
    return Token.UINT64_LE.get(buf, offset);
  }

get: (buf: Buffer, off: number): IChunkHeader => {
    return {id: FourCcToken.get(buf, off), size: Token.UINT64_LE.get(buf, off + 4)};
  }
};

async function readHeader() {
			const guid = Buffer.alloc(16);
			await tokenizer.readBuffer(guid);
			return {
				id: guid,
				size: await tokenizer.readToken(Token.UINT64_LE)
			};
		}