How to use the azure-devops-node-api/interfaces/BuildInterfaces.BuildResult.Failed function in azure-devops-node-api

build = await this.checkBuildPipelines();
    if (build === null) {
      // Pipelines timeout.
      await this.release.update({ state: ReleaseState.failed, reason: ReleaseReason.timeout });
      // Raise error to retry.
      throw new Error(`[id=${this.release.id}] [build_id=${this.release.build_id}] build pipelines timeout.`);
    } else if (build.status == BuildStatus.Completed && build.result == BuildResult.Succeeded) {
      // Pipelines succeeded.
      await this.release.update({ state: ReleaseState.succeeded });
      logger.info(`[id=${this.release.id}] [build_id=${this.release.build_id}] build pipelines succeeded.`);
    } else {
      // Pipelines failed.
      await this.release.update({ state: ReleaseState.failed });
      let reason = '';
      // Update publish_log.
      if (build.status == BuildStatus.Completed && build.result == BuildResult.Failed) {
        // Fetch build message.
        let publishLog = await this.getPublishLog();
        // Find reason.
        reason = this.getReasonFromPublishLog(publishLog);
        // Update to database.
        await this.release.update({ publish_log: publishLog, reason });
      }
      let statusName = BuildStatusEnum.getKeyOrThrow(build.status);
      let resultName = typeof build.result === 'undefined'
        ? 'undefined'
        : BuildResultEnum.getKeyOrThrow(build.result);
      if (reason != ReleaseReason.badGateway && reason != ReleaseReason.serverError) {
        // Acceptable failure reason, just log it.
        logger.error(`[id=${this.release.id}] [build_id=${this.release.build_id}] build pipelines failed, status ${statusName}, result ${resultName}, reason ${reason}`);
      }
      else {