export interface KeyChoice<T> {
    /** The single character the label advertises. Matched case-insensitively. */
    key: string;
    label: string;
    value: T;
}
/** Which choice a keypress selects, or null if it selects nothing. */
export declare function matchChoiceKey<T>(choices: readonly KeyChoice<T>[], input: string): number | null;
/** The lines of the list, with the caret on the highlighted row. */
export declare function renderChoiceLines<T>(choices: readonly KeyChoice<T>[], selected: number, caret?: string): string[];
/**
 * Asks, and returns the chosen value.
 *
 * Falls back to reading a whole line where there is no terminal to take single keys from. A piped
 * answer of "y" should still work, and refusing to run because stdin is not a tty would make the
 * prompt worse than whatever it is guarding.
 */
export declare function askChoice<T>(message: string, choices: readonly KeyChoice<T>[], onCancel: T, io?: {
    input?: NodeJS.ReadStream;
    output?: NodeJS.WriteStream;
}): Promise<T>;
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