/**
 * Headless editable-TTY sudo backend.
 *
 * When there's no GUI but the node-server has a controlling terminal, the
 * approval gesture is a keystroke on stdin: `[a]llow once / [d]eny / [A]lways`.
 * Choosing "Always" then reads an editable pattern line (blank keeps the
 * suggested default). Fail closed: a closed stream, EOF, or any error denies.
 */
import type { Interface as ReadlineInterface } from 'readline';
import type { SudoBackend } from './types.js';
/** Seam for tests: build a question-asking interface over arbitrary streams. */
export interface TtyDeps {
    output?: NodeJS.WritableStream;
    createRl?: () => Pick<ReadlineInterface, 'question' | 'close'>;
}
/** Create the editable-TTY backend. */
export declare function createTtyBackend(deps?: TtyDeps): SudoBackend;