/**
 * Delegator class that convert data subscribed from Firestore or set to Firestore.
 * This is called when you use `mapOf` function in `from`, `FirestoreSubscriber`, `FirestoreFinder`
 * @example
 * class Model extends FirestoreMapper {
 *   static fromJson(data: { [key: string]: any }) {
 *     return new Model()
 *   }
 *
 *   static toJson(data: Model) {
 *     return { id: data.id }
 *   }
 * }
 */
export declare abstract class FirestoreMapper {
    /**
     * Mapper that converts data subscribed from Firestore
     * @param data  { [key: string]: any }
     * @returns any
     * @example
     * class Model extends FirestoreMapper {
     *   id: string
     *   firstName: string
     *   familyName: string
     *
     *   static fromJson(data: { [key: string]: any }): Model {
     *     return {
     *       id: data.id,
     *       firstName: data.first_name,
     *       familyName: data.family_name
     *     } as Model
     *   }
     *
     *   constructor(data: Partial<Model> = {}) {
     *     this.id = data.id || ''
     *     this.firstName = data.firstName || ''
     *     this.familyName = data.familyName || ''
     *   }
     * }
     */
    static fromJson(data: {
        [key: string]: any;
    }): any;
    /**
     * Mapper used before registering data in Firestore.
     * This is called when you use `mapOf` function in `to`, `FirestoreAdder`, `FirestoreSetter`, `FirestoreMergeSetter`
     * @param data  { [key: string]: any }
     * @returns any
     * @example
     * class Model extends FirestoreMapper {
     *   id: string
     *   firstName: string
     *   familyName: string
     *
     *   static toJson(data: Model): Model {
     *     return {
     *       id: data.id,
     *       first_name: data.firstName,
     *       family_name: data.familyName
     *     } as Model
     *   }
     *
     *   constructor(data: Partial<Model> = {}) {
     *     this.id = data.id || ''
     *     this.firstName = data.firstName || ''
     *     this.familyName = data.familyName || ''
     *   }
     * }
     */
    static toJson(data: {
        [key: string]: any;
    }): any;
}