import type { Channel } from "./channel.js";
import { type ClientKind } from "./protocol.js";
import { type SessionState } from "./sessionRules.js";
export type SessionTimers = {
    set(fire: () => void, ms: number): unknown;
    clear(handle: unknown): void;
};
export type SessionChannelOptions = {
    now?: () => number;
    /** The lease timer; a test injects a fake clock. The default is
     *  `setTimeout`, unreferenced, so a held session never keeps a
     *  finished program alive on its own. */
    timers?: SessionTimers;
    /** What the driver's `keepAlive` does: with no socket of its own to
     *  hold, the session refs the server while a request is pending. */
    keepAlive?: (on: boolean) => void;
    /** Where the lease's line goes; the program's stderr by default. */
    log?: (line: string) => void;
};
export type SessionChannel = Channel & {
    /** A connection that sent `client` with this kind. */
    admit(channel: Channel, kind: ClientKind): void;
    state(): SessionState;
    /** End the session: every party's channel is closed and the driver's
     *  side sees the channel close. */
    end(): void;
};
export declare function sessionChannel(options?: SessionChannelOptions): SessionChannel;