elk/page-lifecycle.d.ts

declare module 'page-lifecycle/dist/lifecycle.mjs' {
  type PageLifecycleState = 'active' | 'passive' | 'hidden' | 'frozen' | 'terminated'

  interface PageLifecycleEvent extends Event {
    newState: PageLifecycleState
    oldState: PageLifecycleState
  }
  interface PageLifecycle extends EventTarget {
    get state(): PageLifecycleState
    get pageWasDiscarded(): boolean
    addUnsavedChanges: (id: symbol | any) => void
    removeUnsavedChanges: (id: symbol | any) => void
    addEventListener: (type: string, listener: (evt: PageLifecycleEvent) => void) => void
  }
  const lifecycle: PageLifecycle
  export default lifecycle
}