import { EventEmitter } from "node:events";
import type { SuperJSON } from "superjson";
import type { AppendOnlyLog } from "./log.js";
import type { FsDuplexMessageType, FsDuplexParty, FsDuplexPayloads } from "./protocol.js";
export type MessageChannelEventMap = {
    [key in FsDuplexMessageType]: [FsDuplexPayloads[key]];
} & {
    open: [];
    close: [];
    error: [Error];
};
export declare class MessageChannel<P extends FsDuplexParty> extends EventEmitter<MessageChannelEventMap> {
    readonly party: P;
    readonly log: AppendOnlyLog;
    private superjson;
    private processor;
    private state;
    private localSeq;
    private localAck;
    get currentState(): "opening" | "open" | "closing" | "closed";
    constructor(party: P, superjson: SuperJSON, log: AppendOnlyLog);
    handleLogData(): Promise<void>;
    send<T extends FsDuplexMessageType>(type: T, payload: FsDuplexPayloads[T]): void;
    close(): void;
}
//# sourceMappingURL=channel.d.ts.map