import { SeederCollection } from '../common';
/**
 * Defines transformer function, which manipulates collections before using them to database seeding.
 */
export declare type CollectionTransformerFn = (c: SeederCollection) => SeederCollection;
/**
 * Contains default transformer functions.
 */
export declare const DefaultTransformers: {
    replaceDocumentIdWithUnderscoreId: (collection: SeederCollection) => SeederCollection;
    setCreatedAtTimestamp: (collection: SeederCollection) => SeederCollection;
    setUpdatedAtTimestamp: (collection: SeederCollection) => SeederCollection;
};