/**
 * Place `value` on the system clipboard.
 *
 * It THROWS when the clipboard is unreachable — a non-secure origin, a browser
 * without the async clipboard, a denied permission — rather than resolving. Every
 * caller confirms the write in the UI, and a confirmation for a copy that never
 * happened sends the user off to paste nothing.
 */
export declare function copyText(value: string): Promise<void>;