export type OutputFormat = "toon" | "json" | "text";
/** Valid --format values, for usage messages. */
export declare const VALID_FORMATS: readonly OutputFormat[];
/** True iff `flag` is one of the recognized output formats. */
export declare function isValidFormat(flag: string): flag is OutputFormat;
export declare function resolveFormat(flag: string | undefined, isTTY: boolean): OutputFormat;
export declare function toonEncode(value: unknown): string;
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