import type { Queue } from './queue.js';
import type { ReadBatchResult } from './queue.js';
interface FlusherOptions {
    queue: Queue;
    dir: string;
    endpoint: string;
}
/**
 * The batch envelope that leaves the machine — the ONE definition of it.
 *
 * Named and exported so `privacy-doc-sync.test.ts` can derive the documented field list from the
 * thing that actually builds the request, rather than restating it. That file's own docstring
 * explains why a hardcoded list is the wrong guard ("a hardcoded list is blind by construction"
 * to a NEW field reaching the wire), and its batch-wrapper half was exactly such a list.
 *
 * `generation` is deliberately NOT here. It rides on each queued `QueueRecord` and groups the
 * batch, but is not transmitted — see the note on `bumpGeneration` for what it does and does not
 * do. If it is ever sent, this function is where that becomes visible.
 */
export declare function buildUploadBody(first: ReadBatchResult['records'][number], events: Record<string, unknown>[]): Record<string, unknown>;
export declare class Flusher {
    #private;
    constructor(opts: FlusherOptions);
    get backoffActive(): boolean;
    start(): void;
    stop(): void;
    drain(): Promise<void>;
    flush(): Promise<void>;
    clearBackoff(): void;
}
export {};
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