export interface CostOptions<Cost> {
    /**
     * Cost value for the initial node.
     */
    zero: Cost;
    /**
     * Function to add cost values.
     */
    add: (a: Cost, b: Cost) => Cost;
    /**
     * Function used to determine the order of the elements. It is expected to return
     * a negative value if the first argument is less than the second argument, zero if they're equal, and a positive
     * value otherwise.
     */
    compareFn: (a: Cost, b: Cost) => number;
}
export declare const numberCostOptions: CostOptions<number>;