declare class LabelCache {
    private maxEntries;
    private cache;
    constructor(maxEntries?: number);
    private getKey;
    get(url: string, label: string): string | null;
    set(url: string, label: string, ref: string): void;
    invalidate(url: string): void;
    private evict;
}
export declare const labelCache: LabelCache;
export {};