How to use the azure-actions-appservice-rest/Utilities/AzureAppServiceUtility.AzureAppServiceUtility function in azure-actions-appservice-rest

return __awaiter(this, void 0, void 0, function* () {
            this.appService = new azure_app_service_1.AzureAppService(this.taskParams.endpoint, this.taskParams.resourceGroupName, this.taskParams.appName, this.taskParams.slotName);
            this.appServiceUtility = new AzureAppServiceUtility_1.AzureAppServiceUtility(this.appService);
            this.kuduService = yield this.appServiceUtility.getKuduService();
            this.kuduServiceUtility = new KuduServiceUtility_1.KuduServiceUtility(this.kuduService);
            // setting application url
            this.applicationURL = yield this.appServiceUtility.getApplicationURL();
        });
    }

private async initializeForSPN() {        
        this.appService = new AzureAppService(this.taskParams.endpoint, this.taskParams.resourceGroupName, this.taskParams.appName, this.taskParams.slotName);
        this.appServiceUtility = new AzureAppServiceUtility(this.appService);
        
        this.kuduService = await this.appServiceUtility.getKuduService();
        this.kuduServiceUtility = new KuduServiceUtility(this.kuduService);
        
        // setting application url
        this.applicationURL = await this.appServiceUtility.getApplicationURL();
    }