runner.ts

type CallbackRunnerType = (startDate?: Date) => void | Promise<void>;

export default class Runner {
  private milliseconds: number;
  private exit: boolean;

  constructor(milliseconds: number) {
    this.milliseconds = milliseconds;
    this.exit = false;
  }

  public async emergency() {
    this.exit = true;
  }

  public async start(callback: CallbackRunnerType): Promise<void> {
    while (Infinity) {
      try {
        const date = new Date();

        if (this.exit) {
          break;
        }
        await callback(date);
      } catch (err) {
        console.error(err);
      } finally {
        if (this.exit) {
          break;
        }
        await this.delay();
      }
    }
  }

  private async delay(): Promise<void> {
    await new Promise(resolve =>
      setTimeout(() => {
        resolve();
      }, this.milliseconds)
    );
  }
}