How to use the @webassemblyjs/leb128.decodeUInt64 function in @webassemblyjs/leb128

function readU64() {
    var bytes = readBytes(MAX_NUMBER_OF_BYTE_U64);
    var buffer = Buffer.from(bytes);
    return decodeUInt64(buffer);
  }

function readU64() {
    var bytes = readBytes(MAX_NUMBER_OF_BYTE_U64);
    var buffer = Buffer.from(bytes);
    return decodeUInt64(buffer);
  }

function readU64() {
    var bytes = readBytes(MAX_NUMBER_OF_BYTE_U64);
    var buffer = Buffer.from(bytes);
    return decodeUInt64(buffer);
  }

function readU64(): Decoded64 {
    const bytes = readBytes(MAX_NUMBER_OF_BYTE_U64);
    const buffer = Buffer.from(bytes);

    return decodeUInt64(buffer);
  }