import type { Formatter, OutputFormat } from '../types.js';
/**
 * The complete set of formats sessionr understands. Anything else is a
 * validation error — agents that pass `--output xml` (or any other typo)
 * should be told explicitly, not silently routed to a plain-text fallback.
 *
 * Keep this list in sync with `OutputFormat` in src/types.ts.
 */
export declare const ACCEPTED_OUTPUT_FORMATS: readonly OutputFormat[];
export declare function isAcceptedOutputFormat(value: unknown): value is OutputFormat;
export declare function createFormatter(opts: {
    output?: OutputFormat;
    json?: boolean;
    isTTY: boolean;
}): Formatter;
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