/**
 * An entity that can produce a human-readable display string.
 */
export interface TDisplayable {
    /**
     * Renders the entity as a human-readable string.
     *
     * @returns A human-readable display string.
     */
    toDisplayString(): string;
}
/**
 * An entity that can produce hierarchical content checksums:
 * meta (entity-only), descendant (children), and combined (both).
 */
export interface THierarchicalChecksummable<TCollectionName extends string = string> {
    /** Returns the meta checksum — derived from entity data only. */
    checksum(): string;
    /** Returns the descendant checksum — derived from children's combinedChecksums. Null if no children. */
    descendantChecksum(): string | null;
    /** Returns the combined checksum — hash(checksum + descendantChecksum), or equals checksum if no descendants. */
    combinedChecksum(): string;
    /** Returns the checksum for a named descendant collection. Null if collection is empty. */
    getCollectionChecksum(name: TCollectionName): string | null;
    /** Forces recomputation of all dirty checksums in the hierarchy. */
    flushChecksums(): void;
}
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