import { CadObject } from './CadObject.js';
import { CollectionChangedEventArgs } from './CollectionChangedEventArgs.js';
export declare class CadObjectCollection<T extends CadObject> implements Iterable<T> {
    onAdd: ((sender: unknown, args: CollectionChangedEventArgs) => void) | null;
    onRemove: ((sender: unknown, args: CollectionChangedEventArgs) => void) | null;
    readonly owner: CadObject;
    get count(): number;
    protected readonly _entries: Set<T>;
    constructor(owner: CadObject);
    getAt(index: number): T | undefined;
    add(item: T): void;
    addRange(items: Iterable<T>): void;
    clear(): void;
    remove(item: T): T | null;
    [Symbol.iterator](): Iterator<T>;
}
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