import type { Readable, Writable } from "node:stream";
import type { Palette } from "./ui-colour.js";
export interface ThemeIO {
    input: Readable;
    output: Writable;
}
export interface SelectOption {
    value: string;
    label: string;
    hint?: string;
    dim?: boolean;
}
/** A text question: what an empty answer would mean, and the rule a typed one must pass. */
export interface TextOptions {
    placeholder?: string;
    /** The one-line error shown under the input; `undefined` accepts. */
    validate?: (value: string) => string | undefined;
}
export interface Theme {
    /** `undefined` and clack's cancel symbol both mean the person left the question. */
    select(message: string, options: SelectOption[], initialValue?: string): Promise<string | symbol | undefined>;
    /** `hint` is one dim line under the question, the way Hermes marks a step a person may skip. */
    confirm(message: string, initialValue: boolean, hint?: string): Promise<boolean | symbol | undefined>;
    text(message: string, initialValue: string, options?: TextOptions): Promise<string | symbol | undefined>;
    password(message: string): Promise<string | symbol | undefined>;
    intro(message: string): void;
    outro(message: string): void;
    /** A finished step: the diamond the prompts leave behind, in Relay blue. */
    step(message: string): void;
    /** A sentence inside the gutter that is neither a question nor a step. */
    message(message: string): void;
    spinner(): {
        start(message: string): void;
        stop(message: string): void;
    };
}
export declare const makeTheme: (p: Palette, io: ThemeIO) => Theme;
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