import type { PromptColors } from "#setup/cli/index.js";
/**
 * Two-stage Escape-to-quit state for an interactive prompt.
 *
 * The wizard collects several answers in a row, so quitting on the very first
 * Escape is easy to trigger by accident. Instead the first Escape "arms" a quit
 * hint, the second Escape quits, and any other key disarms. This mirrors the
 * familiar "press again to exit" pattern from editors and shells.
 */
export interface QuitGuardState {
    /** True after a single Escape, when the next Escape will quit the wizard. */
    readonly armed: boolean;
}
/** Nothing armed yet: the starting state for every prompt. */
export declare const initialQuitGuardState: QuitGuardState;
/**
 * Key intents the guard distinguishes. Escape arms or quits; every other key is
 * collapsed to `other-key`, which only matters while armed (it disarms).
 */
export type QuitGuardEvent = {
    type: "escape";
} | {
    type: "other-key";
};
/**
 * Side effect the prompt wiring should perform after the transition. Only `quit`
 * requires the caller to act (cancel the prompt); `arm`/`disarm`/`none` are
 * reflected purely by re-rendering with the returned {@link QuitGuardState}.
 */
export type QuitGuardAction = "none" | "arm" | "quit" | "disarm";
/**
 * Advances the guard for a single keypress.
 *
 * - Escape while disarmed arms the guard and surfaces the quit hint.
 * - Escape while armed quits.
 * - Any other key while armed disarms (the user kept going), clearing the hint.
 */
export declare function reduceQuitGuard(state: QuitGuardState, event: QuitGuardEvent): {
    state: QuitGuardState;
    action: QuitGuardAction;
};
/**
 * The status note shown on the prompt's corner line while the guard is armed, or
 * `undefined` when it is not. Rendered as a corner-line tail so it reads like a
 * status bar pinned under the active prompt.
 */
export declare function quitHintNote(state: QuitGuardState, colors: PromptColors): string | undefined;