How to use the @alfresco/js-api.AlfrescoApiConfig function in @alfresco/js-api

constructor(public appConfig: AppConfigService, public storageService: StorageService) {
        super(null, null);
        const oauth = Object.assign({}, this.appConfig.get(AppConfigValues.OAUTHCONFIG, null));
        this.storageService.prefix = this.appConfig.get(AppConfigValues.STORAGE_PREFIX, '');
        this.config = new AlfrescoApiConfig({
            provider: this.appConfig.get(AppConfigValues.PROVIDERS),
            hostEcm: this.appConfig.get(AppConfigValues.ECMHOST),
            hostBpm: this.appConfig.get(AppConfigValues.BPMHOST),
            authType: this.appConfig.get(AppConfigValues.AUTHTYPE, 'BASIC'),
            contextRootBpm: this.appConfig.get(AppConfigValues.CONTEXTROOTBPM),
            contextRoot: this.appConfig.get(AppConfigValues.CONTEXTROOTECM),
            disableCsrf: this.appConfig.get(AppConfigValues.DISABLECSRF),
            withCredentials: this.appConfig.get(AppConfigValues.AUTH_WITH_CREDENTIALS, false),
            domainPrefix: this.storageService.prefix,
            oauth2: oauth
        });
    }

protected initAlfrescoApi() {
        const oauth: OauthConfigModel = Object.assign({}, this.appConfig.get(AppConfigValues.OAUTHCONFIG, null));
        if (oauth) {
            oauth.redirectUri = window.location.origin + (oauth.redirectUri || '/');
            oauth.redirectUriLogout = window.location.origin + (oauth.redirectUriLogout || '/');
        }

        const config = new AlfrescoApiConfig({
            provider: this.appConfig.get(AppConfigValues.PROVIDERS),
            hostEcm: this.appConfig.get(AppConfigValues.ECMHOST),
            hostBpm: this.appConfig.get(AppConfigValues.BPMHOST),
            authType: this.appConfig.get(AppConfigValues.AUTHTYPE, 'BASIC'),
            contextRootBpm: this.appConfig.get(AppConfigValues.CONTEXTROOTBPM),
            contextRoot: this.appConfig.get(AppConfigValues.CONTEXTROOTECM),
            disableCsrf: this.appConfig.get(AppConfigValues.DISABLECSRF),
            withCredentials: this.appConfig.get(AppConfigValues.AUTH_WITH_CREDENTIALS, false),
            domainPrefix : this.appConfig.get(AppConfigValues.STORAGE_PREFIX),
            oauth2: oauth
        });

        if (this.alfrescoApi && this.isDifferentConfig(this.lastConfig, config)) {
            this.lastConfig = config;
            this.alfrescoApi.configureJsApi(config);
        } else {