method Buffer.prototype.readBigInt64BEimport { Buffer } from "https://dotland.deno.dev/std@0.177.0/node/buffer.ts"; readBigInt64BE(offset?: number): bigintReads a signed, big-endian 64-bit integer from buf at the specified offset. Reads a signed, big-endian 64-bit integer from buf at the specified offset. Integers read from a Buffer are interpreted as two's complement signed values. Parametersoptionaloffset: numberNumber of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8. Returnsbigint