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

private write(
        dataToWrite: Buffer,
        methodName: string,
        options: RequestOptions = {},
        retry: boolean = false,
    ): Promise {
        const requestUrl: string =
            this.withEndpointPerMethod && retry === false
                ? `${this.url}/${this.serviceName}/${methodName}`
                : this.url

        // Merge user options with required options
        const requestOptions: RequestOptions & UrlOptions = Core.overlayObjects(
            this.requestOptions,
            options,
            {
                method: 'POST',
                body: dataToWrite,
                encoding: null, // Needs to be explicitly set to null to get Buffer in response body
                url: requestUrl,
                headers: {
                    'Content-Length': dataToWrite.length,
                    'Content-Type': 'application/octet-stream',
                },
            },
        )

        return new Promise((resolve, reject) => {
            request(