import type { Readable, Writable } from 'node:stream';
import { type Syntax } from '../pretty.js';
export type FormatOptions = {
    fromSyntax?: Syntax;
    toSyntax?: Syntax;
    language?: string;
};
export declare function formatCommand(files: string[], stdin: Readable | null, stdout: Writable | null, options: FormatOptions): Promise<void>;