How to use the artifact-engine/Providers/typed-rest-client/RestClient.RestClient function in artifact-engine

caFile: global['_vsts_task_lib_cert_ca'],
                    certFile: global['_vsts_task_lib_cert_clientcert'],
                    keyFile: global['_vsts_task_lib_cert_key'],
                    passphrase: this._readTaskLibSecrets(global['_vsts_task_lib_cert_passphrase']),
                };

                this.options.cert = certFromEnv;
            }
        }

        // try get ignore SSL error setting from environment variable set by VSTS-Task-Lib if there is no ignore SSL error setting in the options
        if (!this.options.ignoreSslError) {
            this.options.ignoreSslError = !!global['_vsts_task_lib_skip_cert_validation'];
        }

        this.rest = new rm.RestClient('vsts-node-api', null, [this.authHandler], this.options);
        this.vsoClient = new vsom.VsoClient(defaultUrl, this.rest);
    }