WebEventsMessageEventInitinterface MessageEventInitextends EventInitType Parameters ##T = any Properties ##data: T optional#lastEventId: string optional#origin: string optional#ports: MessagePort[] optional#source: MessageEventSource | null optional
interface MessageEventInitextends EventInitType Parameters ##T = any Properties ##data: T optional#lastEventId: string optional#origin: string optional#ports: MessagePort[] optional#source: MessageEventSource | null optional