/**
 * @packageDocumentation
 *
 * Type guard for formatter functions.
 */
import type { Formatter } from './types.js';
/**
 * Determine if a value conforms to the {@link Formatter} signature.
 *
 * @param value - Value to test.
 * @returns Whether the value is a formatter function.
 *
 * @example
 * isFormatter(() => '');
 * // => true
 * isFormatter('not a function');
 * // => false
 */
export declare function isFormatter(value: unknown): value is Formatter;
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