TS CookieHelper Class

Cookie Helper

class CookieHelper {

    setCookie(cookieName: string, cookieValue: number | string, cookieExpires: number) {
        const date = new Date();
        date.setTime(date.getTime() + (cookieExpires * 24 * 60 * 60 * 1000));
        const expires = `expires=${date.toUTCString()}`;
        document.cookie = `${cookieName}=${cookieValue};${expires};path=/`;
    }

    getCookie(cookieName: string) {
        const name = cookieName + '=';
        const doesCookieExist = document.cookie.split(';').filter(function(item) {
            return item.indexOf(`${cookieName}=`) >= 0;
        });
        return doesCookieExist.length > 0 ? doesCookieExist[0].split('=')[1] : '';
    }

    checkCookie(cookieName: string, valueIfEmpty: number | string, lifeSpan: number) {
        const cookieValue = this.getCookie(cookieName);
        if (cookieValue !== '') {
            return cookieValue;
        } else {
            this.setCookie(cookieName, valueIfEmpty, lifeSpan);
            return valueIfEmpty;
        }
    }
}

export default new CookieHelper();

This looks super helpful! Hope you don't mind, I cleaned it up a bit and will be integrating this into a project I'm working on :)

type CookieValue = number | string;
type Milliseconds = number;

interface Cookie {
  name?: string;
  value?: CookieValue;
  expires?: Milliseconds;
}

class CookieHelper {
  private DEFAULT_EXPIRY_TIME_MS = 24 * 60 * 60 * 1000;

  public set({ name, value, expires }: Cookie): void {
    const expiryTime = expires || this.DEFAULT_EXPIRY_TIME_MS;
    let date = new Date();
    date.setTime(date.getTime() + expiryTime);
    document.cookie = `${name}=${value};expires=${date.toUTCString()};path=/`;
  }

  public get({ name }: Cookie): string {
    const foundCookieByName = document.cookie
      .split(';')
      .filter(item => item.indexOf(`${name}=`) >= 0);
    const cookieExists = !!foundCookieByName.length;
    return cookieExists ? foundCookieByName[0].split('=')[1] : '';
  }

  public check({ name, value, expires }: Cookie): CookieValue {
    const cookieValue = this.get({ name });
    if (cookieValue !== '') {
      return cookieValue;
    }
    this.set({name, value, expires});
    return value;
  }
}

export default new CookieHelper();

... meanwhile ...

import Cookies from 'cookie-helper';

Cookies.set({ 
  name: 'glass_cage_of_emotion',
  value: 'milk was a bad choice', 
  expires: 9999999,
});