/**
 * Implementation of a dependency graph.
 */
export declare class DependencyGraph<T> {
    private _list;
    private _dependOn;
    private _requiredBy;
    /**
     * Creates a new instance of a dependency graph.
     */
    constructor();
    /**
     * Adds an element to the graph.
     * @param element - The element to add to the graph.
     */
    addElement(element: T): void;
    /**
     * Adds a dependency between two elements.
     * @param element - The element that depends on another element.
     * @param dependency - The element that is required by the element passed as the first parameter.
     */
    addDependency(element: T, dependency: T): void;
    /**
     * Walks through the graph and calls the callback for each element.
     * The elements that depend on other elements will be traversed after the elements they depend on.
     * Note: the graph will be modified during the walk, so don't call walk twice on the same graph!
     * @param callback - The callback to call for each element.
     */
    walk(callback: (element: T) => void): void;
}
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