import type { Fn0, IObjectOf, Maybe, Nullable, Pair } from "@thi.ng/api";
export interface MultiTrieOpts<V> {
    /**
     * Custom value set factory (e.g. for using `Set` implementations from the
     * [thi.ng/associative](https://thi.ng/associative) package). Uses native
     * ES6 Set by default.
     */
    vals: Fn0<Set<V>>;
}
export declare class MultiTrie<K extends ArrayLike<any>, V> {
    protected opts?: Partial<MultiTrieOpts<V>> | undefined;
    protected next: IObjectOf<MultiTrie<K, V>>;
    protected vals?: Set<V>;
    protected n: number;
    constructor(pairs?: Nullable<Iterable<Pair<K, V>>>, opts?: Partial<MultiTrieOpts<V>> | undefined);
    [Symbol.iterator](): Generator<(string | V)[], void, unknown>;
    keys(sep?: string, prefix?: string): Generator<string, void, unknown>;
    values(): Generator<V, void, unknown>;
    suffixes(prefix: K, withPrefix?: boolean, sep?: string): Generator<string, void, unknown>;
    clear(): void;
    has(key: K): boolean;
    hasPrefix(prefix: K): boolean;
    get(key: K): Maybe<Set<V>>;
    find(key: K): MultiTrie<K, V> | undefined;
    /**
     * Returns longest known prefix for `key` as array. If array is
     * empty, the given key has no partial matches.
     *
     * @param key -
     */
    knownPrefix(key: K): K[];
    hasKnownPrefix(key: K): boolean;
    add(key: K, val: V): void;
    into(pairs: Iterable<[K, V]>): void;
    delete(prefix: K, val?: V): boolean;
    protected queueChildren(queue: [string, MultiTrie<any, any>][], prefix: string, sep?: string): void;
}
export declare const defMultiTrie: <K extends ArrayLike<any>, V>(pairs?: Iterable<Pair<K, V>>, opts?: Partial<MultiTrieOpts<V>>) => MultiTrie<K, V>;
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