import type { Subscriber, BusMessage } from './envelope-bus.js';
import type { PlainLogEntry } from './plain-log-entry.js';
export declare class StderrLogSubscriber implements Subscriber {
    private write;
    readonly name = "stderr-log";
    constructor(write?: (line: string) => void);
    receive(msg: BusMessage): void;
}
/**
 * Format a PlainLogEntry as a single `[mma] event=... ts=... key=val` line.
 * Primitive values are emitted directly (snake-cased, quoted only when they
 * contain whitespace or quotes). One line per event — operators can grep this
 * stream the same way they'd grep the JSONL log.
 */
export declare function formatStderrLine(entry: PlainLogEntry): string;
//# sourceMappingURL=stderr-log-subscriber.d.ts.map