import { ObjectId } from 'mongodb';
/**
 * Minimal DataLoader-style batching helper for GraphQL resolvers, with no hard
 * dependency on any GraphQL package. `.load(id)` calls made within the same
 * microtask are coalesced into a single `$in` query against the repository, so
 * per-field resolvers never trigger N+1 reads.
 *
 * ```ts
 * const userLoader = createEntityLoader(userRepo);
 * // in a resolver: () => userLoader.load(post.authorId)
 * ```
 */
export interface EntityLoader<T> {
    load(id: string | ObjectId): Promise<T | null>;
    loadMany(ids: Array<string | ObjectId>): Promise<Array<T | null>>;
    prime(id: string | ObjectId, value: T): void;
    clear(id?: string | ObjectId): void;
}
/** The slice of a repository the loader needs. Structural, so any repo satisfies it. */
export interface LoaderSource<T> {
    find(filter: unknown, options?: unknown): Promise<T[]>;
}
export declare function createEntityLoader<T extends {
    id?: string;
    _id?: unknown;
}>(source: LoaderSource<T>): EntityLoader<T>;
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