import type { OutputFormat } from './output.js';
export interface ResolveOutputFormatOptions {
    /** Whether stdout is a terminal. */
    isTty?: boolean;
}
/**
 * Whether to write machine readable output.
 *
 * An explicit `--json` or `--no-json` wins, otherwise the CLI writes JSON
 * whenever stdout is piped or redirected, and pretty output at a terminal.
 *
 * This reads the arguments rather than the parsed args because `--json` is
 * declared as a boolean flag, so that it never consumes the argument after
 * it, and a boolean cannot tell `--no-json` apart from not passing anything.
 */
export declare const resolveOutputFormat: (argv: string[], { isTty }?: ResolveOutputFormatOptions) => OutputFormat;