ReadonlyclientThe client, or a loader that creates it on the first download so the library loads only when used.
Optional ReadonlynowClock for progress throttling; defaults to Date.now.
Optional ReadonlyprogressLeast time between two progress-only notifications; defaults to 500 ms.
Optional ReadonlytrackersPeer-finding servers announced to on every download; defaults to DEFAULT_WEBRTC_TRACKERS.
Options for createWebTorrentBackend.