ekyc

Electronic KYC process with uploading ID document using OAuth 2.1 (experimental)
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ephemeral.ts (676B)

      1 export class Ephemeral<T> {
      2   static of<T>(value: NonNullable<T>, ttl: number): Ephemeral<NonNullable<T>> {
      3     return new this(value, Date.now() + ttl);
      4   }
      5 
      6   static empty(): Ephemeral<never> {
      7     return new this();
      8   }
      9 
     10   constructor(
     11     private readonly value: T | null = null,
     12     public readonly expire: number = 0,
     13   ) {
     14   }
     15 
     16   get ttl(): number {
     17     return Math.max(this.expire - Date.now(), 0);
     18   }
     19 
     20   get isExpired(): boolean {
     21     return this.value === null ||
     22       this.value === undefined ||
     23       this.ttl === 0;
     24   }
     25 
     26   orElse<U = T>(value: U): T | U {
     27     return !this.isExpired ? this.value! : value;
     28   }
     29 
     30   valueOf() {
     31     return this.orElse(null);
     32   }
     33 }