import { MetaType } from './metaTypeCreator';
import { SnapshotMetadata, SnapshotOptions, SnapshotListenOptions, DocumentChangeType } from './alias';
import { DocumentReference, Query } from './refs';
import { DeepValue, ObjectFlatten } from './objectFlatten';
/**
 * A `DocumentSnapshot` contains data read from a document in your Firestore
 * database. The data can be extracted with `.data()` or `.get(<field>)` to
 * get a specific field.
 *
 * For a `DocumentSnapshot` that points to a non-existing document, any data
 * access will return 'undefined'. You can use the `exists()` method to
 * explicitly verify a document's existence.
 */
export interface DocumentSnapshot<T extends MetaType> {
    /**
     *  Metadata about the `DocumentSnapshot`, including information about its
     *  source and local modifications.
     */
    readonly metadata: SnapshotMetadata;
    /**
     * Returns whether or not the data exists. True if the document exists.
     */
    exists(): boolean;
    /**
     * Retrieves all fields in the document as an `Object`. Returns `undefined` if
     * the document doesn't exist.
     *
     * By default, `serverTimestamp()` values that have not yet been
     * set to their final value will be returned as `null`. You can override
     * this by passing an options object.
     *
     * @param options - An options object to configure how data is retrieved from
     * the snapshot (for example the desired behavior for server timestamps that
     * have not yet been set to their final value).
     * @returns An `Object` containing all fields in the document or `undefined` if
     * the document doesn't exist.
     */
    data: (options?: SnapshotOptions) => T['read'] | undefined;
    /**
     * Retrieves the field specified by `fieldPath`. Returns `undefined` if the
     * document or field doesn't exist.
     *
     * By default, a `serverTimestamp()` that has not yet been set to
     * its final value will be returned as `null`. You can override this by
     * passing an options object.
     *
     * @param fieldPath - The path (for example 'foo' or 'foo.bar') to a specific
     * field.
     * @param options - An options object to configure how the field is retrieved
     * from the snapshot (for example the desired behavior for server timestamps
     * that have not yet been set to their final value).
     * @returns The data at the specified field location or undefined if no such
     * field exists in the document.
     */
    get<FieldPath extends keyof T['writeFlatten'] & string>(fieldPath: FieldPath, options?: SnapshotOptions): DeepValue<ObjectFlatten<T['read'], never>, FieldPath> | undefined;
    /**
     * Property of the `DocumentSnapshot` that provides the document's ID.
     */
    get id(): T['docID'];
    /**
     * The `DocumentReference` for the document included in the `DocumentSnapshot`.
     */
    get ref(): DocumentReference<T>;
}
/**
 * A `QuerySnapshot` contains zero or more `DocumentSnapshot` objects
 * representing the results of a query. The documents can be accessed as an
 * array via the `docs` property or enumerated using the `forEach` method. The
 * number of documents can be determined via the `empty` and `size`
 * properties.
 */
export interface QuerySnapshot<T extends MetaType> {
    /**
     * Metadata about this snapshot, concerning its source and if it has local
     * modifications.
     */
    readonly metadata: SnapshotMetadata;
    /**
     * The query on which you called `get` or `onSnapshot` in order to get this
     * `QuerySnapshot`.
     */
    readonly query: Query<T>;
    /** An array of all the documents in the `QuerySnapshot`. */
    get docs(): Array<QueryDocumentSnapshot<T>>;
    /** The number of documents in the `QuerySnapshot`. */
    get size(): number;
    /** True if there are no documents in the `QuerySnapshot`. */
    get empty(): boolean;
    /**
     * Enumerates all of the documents in the `QuerySnapshot`.
     *
     * @param callback - A callback to be called with a `QueryDocumentSnapshot` for
     * each document in the snapshot.
     * @param thisArg - The `this` binding for the callback.
     */
    forEach(callback: (result: QueryDocumentSnapshot<T>) => void | Promise<void>, thisArg?: unknown): void;
    /**
     * Returns an array of the documents changes since the last snapshot. If this
     * is the first snapshot, all documents will be in the list as 'added'
     * changes.
     *
     * @param options - `SnapshotListenOptions` that control whether metadata-only
     * changes (i.e. only `DocumentSnapshot.metadata` changed) should trigger
     * snapshot events.
     */
    docChanges(options?: SnapshotListenOptions): Array<DocumentChange<T>>;
}
/**
 * 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 interface QueryDocumentSnapshot<T extends MetaType> extends DocumentSnapshot<T> {
    /**
     * Retrieves all fields in the document as an `Object`.
     *
     * By default, `serverTimestamp()` values that have not yet been
     * set to their final value will be returned as `null`. You can override
     * this by passing an options object.
     *
     * @override
     * @param options - An options object to configure how data is retrieved from
     * the snapshot (for example the desired behavior for server timestamps that
     * have not yet been set to their final value).
     * @returns An `Object` containing all fields in the document.
     */
    data: (options?: SnapshotOptions) => T['read'];
}
/**
 * A `DocumentChange` represents a change to the documents matching a query.
 * It contains the document affected and the type of change that occurred.
 */
export interface DocumentChange<T extends MetaType> {
    /** The type of change ('added', 'modified', or 'removed'). */
    readonly type: DocumentChangeType;
    /** The document affected by this change. */
    readonly doc: QueryDocumentSnapshot<T>;
    /**
     * The index of the changed document in the result set immediately prior to
     * this `DocumentChange` (i.e. supposing that all prior `DocumentChange` objects
     * have been applied). Is `-1` for 'added' events.
     */
    readonly oldIndex: number;
    /**
     * The index of the changed document in the result set immediately after
     * this `DocumentChange` (i.e. supposing that all prior `DocumentChange`
     * objects and the current `DocumentChange` object have been applied).
     * Is -1 for 'removed' events.
     */
    readonly newIndex: number;
}
export interface AggregateQuerySnapshot<T extends MetaType> {
    /** A type string to uniquely identify instances of this class. */
    readonly type: 'AggregateQuerySnapshot';
    /**
     * The underlying query over which the aggregations recorded in this
     * `AggregateQuerySnapshot` were performed.
     */
    readonly query: Query<T>;
    /**
     * @returns An `Object` containing `count` properties. See https://firebase.blog/posts/2022/12/introducing-firestore-count-ttl-scale
     */
    data(): {
        count: number;
    };
}