/**
 * Logs a dev-mode `console.warn` once per `site`, and never in a production build. Reach for it
 * where a permissive config would otherwise fail silently — a clipped sky dome, an ignored tint.
 * @capability warn-once emit a dev-only warning a single time per call site
 */
export declare function warnOnce(site: string, message: string): void;
/** Clears the once-per-site record so a test can observe the warning again. @internal */
export declare function resetWarnOnce(): void;