/**
 * Warn, in development only, that a row carried neither of a preferred pair
 * of fields and a reader fell back to a legacy one.
 */
export declare function warnLegacyFallback(preferred: string, legacy: string): void;
/**
 * Warn, in development only, that a VIRTUAL child was dropped because nobody
 * said what URL its `filter` becomes.
 *
 * The alternative failures are both silent: a tile with an empty `href`, or a
 * level that renders one row short with no reason given anywhere.
 */
export declare function warnMissingVirtualHref(): void;
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