/**
 * Bounded first-seen dedup — the shared "storm guard" for error-reporting
 * sites (observer sinks, relay/bridge error callbacks). Evicts wholesale at
 * the cap: it is a storm guard, not a permanent ledger, so a previously-seen
 * key may report once more after eviction — an accepted trade for a bounded
 * footprint. (`uwc-bridge-child` keeps a local copy of this logic to stay
 * dependency-free; keep the two in sync.)
 */
export declare function createBoundedDedup(maxEntries: number): {
    /** true the FIRST time a key is seen (and records it); false on repeats. */
    firstSeen(key: string): boolean;
};
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