/**
 * One line for a swallowed failure. Expected absence stays quiet.
 * The line is one JSON object (the runner's stderr is ndjson, see
 * src/bin/sync-runner.ts "Channels") carrying its own event type, the stable
 * event name and the error class or code. It is not an `error` event, so the
 * menubar and the exit-code rollup do not count it as a sync failure.
 * The message is never included: it can carry a user-file path.
 */
export declare const SWALLOWED_ERROR_EVENT_TYPE = "swallowed-error";
export declare function swallowedErrorClass(error: unknown): string;
/**
 * Missing file, missing prefix, or an HTTP/S3 404. ENOTDIR is not absence:
 * it means a state directory was replaced by a file, which should be seen.
 */
export declare function isExpectedAbsence(error: unknown): boolean;
export declare function noteSwallowedError(log: (line: string) => void, event: string, error: unknown, options?: {
    quietOnAbsence?: boolean;
}): void;
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