How to use the typescript-rest.Return.NewResource function in typescript-rest

return new Promise>((resolve, reject) => {
            resolve(new Return.NewResource('id', { name: 'OK' }));
        });
    }

                .then(groupId => resolve(new Return.NewResource(`apis/${apiId}/groups/${groupId}`)))
                .catch(reject);

                .then(corsId => resolve(new Return.NewResource(`apis/${apiId}/cors/${corsId}`)))
                .catch(reject);

                .then(throttlingId => resolve(new Return.NewResource(`apis/${apiId}/throttling/${throttlingId}`)))
                .catch(reject);

private async addMiddleware(type: string, file: Express.Multer.File, name: string, basePath?: string): Promise> {
        await this.service.add(type, name, file.buffer);
        return new Return.NewResource(path.join(basePath || type, name));
    }

                .then(() => resolve(new Return.NewResource(`apis/${apiId}/authentication`)))
                .catch(reject);

                .then(() => resolve(new Return.NewResource(`apis/${apiId}/proxy`)))
                .catch(reject);

public async addApi(api: ApiConfig): Promise> {
        await validateApiConfig(api, this.config.gateway.disableApiIdValidation);
        const apiId = await this.service.create(api);
        return (new Return.NewResource(`apis/${apiId}`));
    }

                .then(cacheId => resolve(new Return.NewResource(`apis/${apiId}/cache/${cacheId}`)))
                .catch(reject);