/**
 * Function signature for checking equality
 */
export interface EqualsFunction<T> {
    (a: T, b: T): boolean;
}
/**
 * Function signature for comparing
 * > 0 => a is larger than b
 * = 0 => a equals b
 * < 0 => a is smaller than b
 */
export interface CompareFunction<T> {
    (a: T, b: T): number;
}
/**
 * Default function to test equality.
 * @function
 */
export declare const defaultEquals: <T>(a: T, b: T) => boolean;
export declare const VALUE_DOES_NOT_EXIST_ERROR = "Value does not exist.";
/**
 * Default function to compare element order.
 * @function
 */
export declare function defaultCompare<T>(a: T, b: T): number;
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