declare module 'libp2p-gossipsub' {
  import Libp2p from 'libp2p'
  import PeerInfo from 'peer-info'
  import PubSub from 'libp2p-pubsub'

  class Heartbeat {
    constructor(gossippub: GossipSub)
    start(callback: Function): void
    stop(callback: Function): void
  }

  interface CacheEntry {
    msgID: string
    topics: string[]
  }

  class MessageCache {
    constructor(gossip: number, history: number)
    msgs: Map<string, any>
    history: Array<Array<CacheEntry>>
    put(msg: any): void
    get(msgID: string): string[]
    getGossipIDs(topic: string): string[]
    shift(): void
  }

  class GossipSub extends PubSub {
    constructor (libp2p: Libp2p, options?: { fallbackToFloodsub?: boolean, emitSelf?: boolean})
    mesh: Map<string, Set<PeerInfo>>
    fanout: Map<string, Set<PeerInfo>>
    lastpub: Map<string, number>
    gossip: Map<PeerInfo, Array<any>>
    control: Map<PeerInfo, any>
    messageCache: MessageCache
    heartbeat: Heartbeat
    start(callback?: Function): Promise<void>
    stop(callback?: Function): Promise<void>
    join(...topics: string[]): Promise<void>
    leave(...topics: string[]): Promise<void>
  }
  // eslint-disable-next-line import/no-default-export
  export default GossipSub
}