method Buffer.readBigInt64BEBuffer.readBigInt64BE(offset?: number): bigintDeprecatedReads 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: number = 0Number of bytes to skip before starting to read. Must satisfy: 0 <= offset <= buf.length - 8. Return Typebigint