this doesn't work in cloudflare workers where time doesn't change

expired-map.ts

export class ExpireMap extends Map {
  expiring = new Map()
  constructor(private _millis: number, private _getTime = this._getTime) {
    super()
  }

  public set<T, V>(key: T, value: V): V {
    const expire = this.getTime() + this._millis
    this.expiring.set(key, expire)
    super.set(key, value)
    return value
  }

  public get<T, V>(key: T): V | undefined {
    const time = this.getTime()
    this.expiring.forEach((exp, _key) => {
      if (exp < time) super.delete(_key)
    })
    return super.get(key)
  }

  private _getTime() {
    return new Date().getTime()
  }
}

export default ExpireMap