/**
 * A helper class that maps from a DOM Node to an arbitrary value.
 */
export declare class NodeMap<T> {
    private static _ID_PROP;
    private static _NEXT_ID;
    private static _isIndex;
    private static _nodeId;
    private readonly _nodes;
    private readonly _values;
    /**
     * Constructs a new and empty NodeMap.
     */
    constructor();
    /**
     * Sets the value of a node within the map.
     * @param node  The node to set the value for.
     * @param value the value to associate with the node.
     */
    set(node: Node, value: T): void;
    /**
     * Gets the value for the given node.
     *
     * @param node The node to get the value of.
     * @returns The value for the given node, or undefined if the node is not
     * present in the map.
     */
    get(node: Node): T | undefined;
    /**
     * Determines if a given node is in the NodeMap.
     *
     * @param node The node to determine if it is in the map.
     *
     * @returns true if the Node is contained in the map, false otherwise.
     */
    has(node: Node): boolean;
    /**
     * Deletes a node from the NodeMap.
     *
     * @param node The node to delete.
     */
    delete(node: Node): void;
    /**
     * @returns an array that holds the nodes that are the keys of the map.
     */
    keys(): Node[];
}