import { DocumentReference } from './reference';
import { ProductDocumentData } from './product';
import { CategoryDocumentData } from './category';
import { ProductCategoryDocumentData } from './product-category';
import { PriceListDocumentData } from './price-list';
import { UserDocumentData } from './user';
import { DeveloperKeyDocumentData } from './developer-key';
declare type DocSnapData = ProductDocumentData | PriceListDocumentData | CategoryDocumentData | ProductCategoryDocumentData | UserDocumentData | DeveloperKeyDocumentData;
export declare abstract class DocumentSnapshot {
    private _ref;
    protected _data: DocSnapData | undefined;
    /**
     * @hideconstructor
     */
    constructor(ref: DocumentReference, data: DocSnapData | undefined);
    /**
     * A [DocumentReference]{@link DocumentReference} for the document
     * @readonly
     */
    readonly ref: DocumentReference;
    /**
     * The ID of the document for which this DocumentSnapshot contains data
     * @readonly
     */
    readonly id: string;
    readonly exists: boolean;
    data(): any | undefined;
}
/**
* A QueryDocumentSnapshot contains data read from a document in your
* Firestore database as part of a query. The document is guaranteed
* to exist and its data can be extracted with .data() or
* .get(<field>) to get a specific field.
*
* A QueryDocumentSnapshot offers the same API surface as a
* DocumentSnapshot. Since query results contain only existing
* documents, the exists property will always be true and
* data() will never return 'undefined'
*/
export declare class QueryDocumentSnapshot extends DocumentSnapshot {
    constructor(ref: DocumentReference, data: DocSnapData | undefined);
}
export {};