import { type FirestoreModelData, type SnapshotConverterConfig, type SnapshotConverterFunctions } from './snapshot.type';
/**
 * Creates converter functions for transforming between Firestore document snapshots and application model objects.
 *
 * This is the primary entry point for defining how your application models map to/from Firestore documents.
 * The returned object implements Firebase's {@link FirestoreDataConverter} interface and can be passed directly
 * to `withConverter()` on collection/document references.
 *
 * This function generates a set of utility functions that handle the conversion between your application's
 * typed model objects and the data format stored in Firestore. It supports field-level conversions,
 * custom modifiers, and handles Firestore's merge options appropriately.
 *
 * @param config - Field mappings and modifiers that drive the conversion.
 * @returns Function set used to convert snapshots and writes for the model.
 *
 * @template T - The application model type that will be used in your application code
 * @template O - The data type that will be stored in Firestore (defaults to FirestoreModelData<T>)
 *
 * @example
 * ```ts
 * // Create a converter for a User model
 * const userConverter = snapshotConverterFunctions<User, UserData>({
 *   fields: {
 *     createdAt: {
 *       from: (date: string) => new Date(date),
 *       to: (date: Date) => date.toISOString()
 *     }
 *   }
 * });
 * // Use with a collection reference
 * const usersCollection = firestore.collection('users').withConverter(userConverter);
 * ```
 *
 * @__NO_SIDE_EFFECTS__
 */
export declare function snapshotConverterFunctions<T extends object, O extends object = FirestoreModelData<T>>(config: SnapshotConverterConfig<T, O>): SnapshotConverterFunctions<T, O>;