/** Find the index of given item */
export type Finder<Type> = (this: Type[], item: Type) => number;
/**
 * Like a Set, but use custom compare function instead ===
 */
export declare abstract class CustomSet<Type> {
    protected registry: Type[];
    protected abstract compare(item1: Type, item2: Type): number;
    has(item: Type): boolean;
    add(item: Type): boolean;
    /**
     * @returns all added values
     */
    addAll(items: Type[]): Type[];
    delete(item: Type): boolean;
    /**
     * @returns all deleted values
     */
    deleteAll(items: Type[]): Type[];
    clear(): void;
    get length(): number;
    [Symbol.iterator](): Iterator<Type>;
    keys(): Iterator<Type>;
    values(): Iterator<Type>;
    toArray(): Type[];
}
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