/**
 * Copy `text` to the clipboard, returning whether it succeeded.
 *
 * Prefers the modern async Clipboard API. It only works in a secure
 * context (HTTPS / localhost) — Signal K servers are commonly served over
 * plain HTTP on a LAN, where `navigator.clipboard` is undefined. Falls back
 * to the legacy `execCommand("copy")` trick (deprecated but still
 * universally supported) so the button does something useful instead of
 * silently failing on older browsers or non-SSL deployments.
 */
export declare function copyTextToClipboard(text: string): Promise<boolean>;
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