import type { OutputFormatMode } from '../members/types.ts';
export declare class OutputFormatError extends Error {
    constructor(message: string);
}
export interface FormatValidationResult {
    valid: boolean;
    message: string;
}
/**
 * Tests output against a declared regex pattern. Pure: no side effects, no
 * throw on invalid regex — a bad pattern reports invalid with a message so the
 * caller can decide how to surface it.
 */
export declare function validateOutputFormat(output: string, pattern: string): FormatValidationResult;
/** Applies the declared mode to a deviation: strict throws, lenient warns. */
export declare function reportFormatDeviation(message: string, mode: OutputFormatMode): never | void;
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