/**
 * Interactive prompt with dropdown autocomplete and ghost-text.
 *
 * When completions are available, a dropdown list renders below the
 * prompt line.  The user can navigate with Up/Down arrows and accept
 * with Tab.  Ghost text (fish-shell style) also shows the highlighted
 * match inline.
 *
 * - Tab        Accept the highlighted suggestion
 * - Up/Down    Navigate the dropdown
 * - Right arrow Accept one ghost character (fish-style)
 * - Enter      Submit the current input
 * - Escape     Dismiss the dropdown
 * - Ctrl-C     Exit
 */
/** Sentinel value returned by promptLine when the user presses Escape to back out. */
export declare const ESCAPE_SIGNAL = "\u001B__ESCAPE__";
export interface PromptOptions {
    prompt: string;
    /** Returns matching completions for the current input. */
    getCompletions: (input: string) => string[];
    /** Number of columns reserved on the right (e.g. sidebar). Input will not overflow into them. */
    reservedRight?: number;
}
export declare function promptLine(opts: PromptOptions): Promise<string>;
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