/**
 * @license
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { FieldPath as InternalFieldPath } from '../model/path';
/**
 * A `FieldPath` refers to a field in a document. The path may consist of a
 * single field name (referring to a top-level field in the document), or a
 * list of field names (referring to a nested field in the document).
 *
 * Create a `FieldPath` by providing field names. If more than one field
 * name is provided, the path will point to a nested field in a document.
 */
export declare class FieldPath {
    /** Internal representation of a Firestore field path. */
    readonly _internalPath: InternalFieldPath;
    /**
     * Creates a FieldPath from the provided field names. If more than one field
     * name is provided, the path will point to a nested field in a document.
     *
     * @param fieldNames - A list of field names.
     */
    constructor(...fieldNames: string[]);
    /**
     * Returns true if this `FieldPath` is equal to the provided one.
     *
     * @param other - The `FieldPath` to compare against.
     * @returns true if this `FieldPath` is equal to the provided one.
     */
    isEqual(other: FieldPath): boolean;
}
/**
 * Returns a special sentinel `FieldPath` to refer to the ID of a document.
 * It can be used in queries to sort or filter by the document ID.
 */
export declare function documentId(): FieldPath;