How to use the @creditkarma/thrift-server-core.Int64 function in @creditkarma/thrift-server-core

formatUrl(request.uri),
                                request.methodName || 'post',
                            )

                            const normalHeaders: any = Object.keys(
                                headers,
                            ).reduce((acc: any, name: string) => {
                                acc[name.toLowerCase()] = headers[name]
                                return acc
                            }, {})

                            const requestHeader: TTwitter.IRequestHeader = {
                                trace_id: new Int64(
                                    `0x${normalHeaders[ZipkinHeaders.TraceId]}`,
                                ),
                                span_id: new Int64(
                                    `0x${normalHeaders[ZipkinHeaders.SpanId]}`,
                                ),
                                parent_span_id:
                                    normalHeaders[ZipkinHeaders.ParentId] !==
                                    undefined
                                        ? new Int64(
                                              `0x${
                                                  normalHeaders[
                                                      ZipkinHeaders.ParentId
                                                  ]
                                              }`,
                                          )
                                        : undefined,
                                sampled:
                                    normalHeaders[ZipkinHeaders.Sampled] ===
                                    '1',

constructor(args: ISpanArgs = {}) {
        super();
        if (args.trace_id != null) {
            const value_32: thrift.Int64 = (typeof args.trace_id === "number" ? new thrift.Int64(args.trace_id) : args.trace_id);
            this.trace_id = value_32;
        }
        if (args.name != null) {
            const value_33: string = args.name;
            this.name = value_33;
        }
        if (args.id != null) {
            const value_34: thrift.Int64 = (typeof args.id === "number" ? new thrift.Int64(args.id) : args.id);
            this.id = value_34;
        }
        if (args.parent_id != null) {
            const value_35: thrift.Int64 = (typeof args.parent_id === "number" ? new thrift.Int64(args.parent_id) : args.parent_id);
            this.parent_id = value_35;
        }
        if (args.annotations != null) {
            const value_36: Array = new Array();

addInt64(a: Int64, b: Int64, context?: Hapi.Request): Int64 {
            return new Int64(a.toNumber() + b.toNumber())
        },
    })

fetchThing(): ICommonStruct {
            return {
                code: {
                    status: new Int64(0),
                },
                value: 'test',
            }
        },
        fetchUnion(): ICommonUnionArgs {

output.writeI64((typeof obj.trace_id === "number" ? new thrift.Int64(obj.trace_id) : typeof obj.trace_id === "string" ? thrift.Int64.fromDecimalString(obj.trace_id) : obj.trace_id));
            output.writeFieldEnd();
        }
        if (obj.name != null) {
            output.writeFieldBegin("name", thrift.TType.STRING, 3);
            output.writeString(obj.name);
            output.writeFieldEnd();
        }
        if (obj.id != null) {
            output.writeFieldBegin("id", thrift.TType.I64, 4);
            output.writeI64((typeof obj.id === "number" ? new thrift.Int64(obj.id) : typeof obj.id === "string" ? thrift.Int64.fromDecimalString(obj.id) : obj.id));
            output.writeFieldEnd();
        }
        if (obj.parent_id != null) {
            output.writeFieldBegin("parent_id", thrift.TType.I64, 5);
            output.writeI64((typeof obj.parent_id === "number" ? new thrift.Int64(obj.parent_id) : typeof obj.parent_id === "string" ? thrift.Int64.fromDecimalString(obj.parent_id) : obj.parent_id));
            output.writeFieldEnd();
        }
        if (obj.annotations != null) {
            output.writeFieldBegin("annotations", thrift.TType.LIST, 6);
            output.writeListBegin(thrift.TType.STRUCT, obj.annotations.length);
            obj.annotations.forEach((value_1: Annotation.IAnnotationArgs): void => {
                Annotation.AnnotationCodec.encode(value_1, output);
            });
            output.writeListEnd();
            output.writeFieldEnd();
        }
        if (obj.binary_annotations != null) {
            output.writeFieldBegin("binary_annotations", thrift.TType.LIST, 8);
            output.writeListBegin(thrift.TType.STRUCT, obj.binary_annotations.length);
            obj.binary_annotations.forEach((value_2: BinaryAnnotation.IBinaryAnnotationArgs): void => {
                BinaryAnnotation.BinaryAnnotationCodec.encode(value_2, output);

encode(args: IRequestHeaderArgs, output: thrift.TProtocol): void {
        const obj: any = {
            trace_id: (typeof args.trace_id === "number" ? new thrift.Int64(args.trace_id) : typeof args.trace_id === "string" ? thrift.Int64.fromDecimalString(args.trace_id) : args.trace_id),
            span_id: (typeof args.span_id === "number" ? new thrift.Int64(args.span_id) : typeof args.span_id === "string" ? thrift.Int64.fromDecimalString(args.span_id) : args.span_id),
            parent_span_id: (typeof args.parent_span_id === "number" ? new thrift.Int64(args.parent_span_id) : typeof args.parent_span_id === "string" ? thrift.Int64.fromDecimalString(args.parent_span_id) : args.parent_span_id),
            sampled: args.sampled,
            client_id: args.client_id,
            flags: (typeof args.flags === "number" ? new thrift.Int64(args.flags) : typeof args.flags === "string" ? thrift.Int64.fromDecimalString(args.flags) : args.flags),
            contexts: args.contexts,
            dest: args.dest,
            delegations: args.delegations
        };
        output.writeStructBegin("RequestHeader");
        if (obj.trace_id != null) {
            output.writeFieldBegin("trace_id", thrift.TType.I64, 1);
            output.writeI64((typeof obj.trace_id === "number" ? new thrift.Int64(obj.trace_id) : typeof obj.trace_id === "string" ? thrift.Int64.fromDecimalString(obj.trace_id) : obj.trace_id));
            output.writeFieldEnd();
        }
        if (obj.span_id != null) {
            output.writeFieldBegin("span_id", thrift.TType.I64, 2);
            output.writeI64((typeof obj.span_id === "number" ? new thrift.Int64(obj.span_id) : typeof obj.span_id === "string" ? thrift.Int64.fromDecimalString(obj.span_id) : obj.span_id));

return client.getStruct(1).then((response: ISharedStruct) => {
            const expected = {
                code: {
                    status: new Int64(0),
                },
                value: 'test',
            }
            expect(response).to.equal(expected)
        })
    })

encode(args: IRequestHeaderArgs, output: thrift.TProtocol): void {
        const obj = {
            trace_id: (typeof args.trace_id === "number" ? new thrift.Int64(args.trace_id) : args.trace_id),
            span_id: (typeof args.span_id === "number" ? new thrift.Int64(args.span_id) : args.span_id),
            parent_span_id: (typeof args.parent_span_id === "number" ? new thrift.Int64(args.parent_span_id) : args.parent_span_id),
            sampled: args.sampled,
            client_id: args.client_id,
            flags: (typeof args.flags === "number" ? new thrift.Int64(args.flags) : args.flags),
            contexts: args.contexts,
            dest: args.dest,
            delegations: args.delegations
        };
        output.writeStructBegin("RequestHeader");
        if (obj.trace_id != null) {
            output.writeFieldBegin("trace_id", thrift.TType.I64, 1);
            output.writeI64(obj.trace_id);
            output.writeFieldEnd();
        }
        if (obj.span_id != null) {
            output.writeFieldBegin("span_id", thrift.TType.I64, 2);

constructor(args?: IRequestHeaderArgs) {
        if (args != null && args.trace_id != null) {
            if (typeof args.trace_id === "number") {
                this.trace_id = new thrift.Int64(args.trace_id);
            }
            else {
                this.trace_id = args.trace_id;
            }
        }
        if (args != null && args.span_id != null) {
            if (typeof args.span_id === "number") {
                this.span_id = new thrift.Int64(args.span_id);
            }
            else {
                this.span_id = args.span_id;
            }
        }
        if (args != null && args.parent_span_id != null) {
            if (typeof args.parent_span_id === "number") {
                this.parent_span_id = new thrift.Int64(args.parent_span_id);
            }
            else {
                this.parent_span_id = args.parent_span_id;
            }
        }
        if (args != null && args.sampled != null) {
            this.sampled = args.sampled;
        }

constructor(args: ISpanArgs = {}) {
        super();
        if (args.trace_id != null) {
            const value_32: thrift.Int64 = (typeof args.trace_id === "number" ? new thrift.Int64(args.trace_id) : args.trace_id);
            this.trace_id = value_32;
        }
        if (args.name != null) {
            const value_33: string = args.name;
            this.name = value_33;
        }
        if (args.id != null) {
            const value_34: thrift.Int64 = (typeof args.id === "number" ? new thrift.Int64(args.id) : args.id);
            this.id = value_34;
        }
        if (args.parent_id != null) {
            const value_35: thrift.Int64 = (typeof args.parent_id === "number" ? new thrift.Int64(args.parent_id) : args.parent_id);
            this.parent_id = value_35;
        }
        if (args.annotations != null) {
            const value_36: Array = new Array();
            args.annotations.forEach((value_39: IAnnotationArgs): void => {
                const value_40: IAnnotation = new Annotation(value_39);
                value_36.push(value_40);
            });
            this.annotations = value_36;
        }
        if (args.binary_annotations != null) {
            const value_37: Array = new Array();