import { ClipboardOptions } from './clipboard.types';
/**
 * Headless clipboard controller. Wires a trigger button to copy text to the
 * system clipboard and reflects a temporary `data-state="copied"` on the root
 * so CSS can swap an icon/label; it never applies visual styles itself.
 *
 * The text comes from (in priority order): the `text` option, or the
 * `[data-c42-clipboard-source]` element (its `value` for inputs/textareas,
 * otherwise its `textContent`).
 *
 * Markup:
 * ```html
 * <div data-c42-clipboard>
 *   <input data-c42-clipboard-source value="npm i @42/core" readonly />
 *   <button data-c42-clipboard-trigger>
 *     <span data-c42-clipboard-copy>Copy</span>
 *     <span data-c42-clipboard-copied hidden>Copied!</span>
 *   </button>
 * </div>
 * ```
 */
export declare class Clipboard {
    private readonly root;
    private readonly trigger;
    private readonly source;
    private text;
    private readonly timeout;
    private timer;
    private cleanups;
    constructor(root: HTMLElement, options?: ClipboardOptions);
    private resolveText;
    private write;
    private flashCopied;
    private emit;
    /** Set/override the text that the trigger copies. */
    setText(text: string | null): void;
    /** Programmatically copy the current text. Resolves to whether it succeeded. */
    copy(): Promise<boolean>;
    /** Subscribe to a DOM event on the root element. Returns an unsubscribe fn. */
    on<E extends Event = Event>(event: string, handler: (event: E) => void): () => void;
    destroy(): void;
}