declare module 'ical.js' {
  export function parse(input: string): unknown[]

  export class Component {
    constructor(jcal: unknown[])
    getAllSubcomponents(name: string): Component[]
    getFirstPropertyValue(name: string): string | null
  }

  export class Event {
    constructor(component: Component)
    summary: string
    startDate: Time
    endDate: Time
  }

  export class Time {
    toJSDate(): Date
  }
}