import type { TaskEnvelope } from './task-envelope.js';
import type { PlainLogEntry } from './plain-log-entry.js';
export type BusMessage = {
    type: 'envelope';
    envelope: TaskEnvelope;
    reason: string;
} | {
    type: 'plain';
    entry: PlainLogEntry;
};
export interface Subscriber {
    readonly name: string;
    receive(msg: BusMessage): void;
}
export declare class EnvelopeBus {
    private subs;
    subscribe(s: Subscriber): () => void;
    /** Private: `subscribe` hands back the closure that calls this, and that closure is the
     *  whole detach API. A second public way to remove a subscriber had no caller anywhere —
     *  including in this repo's own tests — and left the class with two ways to do one thing. */
    private unsubscribe;
    emitEnvelopeSnapshot(envelope: TaskEnvelope, reason: string): void;
    emitPlainEntry(entry: PlainLogEntry): void;
}
//# sourceMappingURL=envelope-bus.d.ts.map