/**
 * Iterates through all children and collects them in a set if the
 * given predicate matches.
 *
 * @param root Root node to get the matching children from.
 * @param predicate Function that will be run for every child of the root node.
 * @param options An optional object with the `deep` option (defaults to `false`) set to `true` to
 * get the children deeply or `false` to get them shallowly.
 * @returns A readonly set with the matching children.
 */
export declare function findChildren<T extends object>(root: object, predicate: (node: object) => boolean, options?: {
    deep?: boolean;
}): ReadonlySet<T>;