/**
 * Lazily-flushed cache of an entity's hierarchical checksums (meta /
 * descendant / combined). Subclasses implement {@link flushChecksums}, which
 * must populate the three cached fields and clear {@link checksumDirty}; the
 * accessors below flush on demand and return the cached value.
 */
export declare abstract class HierarchicalChecksumCache {
    protected checksumDirty: boolean;
    protected cachedMetaChecksum: string | undefined;
    protected cachedDescendantChecksum: string | null | undefined;
    protected cachedCombinedChecksum: string | undefined;
    checksum(): string;
    descendantChecksum(): string | null;
    combinedChecksum(): string;
    abstract flushChecksums(): void;
}
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