import { FlashTextOpt } from './flashtext';
export default class Trie {
    private size;
    private root;
    private readonly opt;
    constructor(opt: FlashTextOpt);
    get length(): number;
    get _root(): any;
    private __formatter;
    insert(kw: string, mapped?: string): boolean;
    del(kw: string): boolean;
    traverse(kw: string, cb?: Function): any;
    toMap(sofar?: string, root?: any): any;
    get(kw: string): any;
    contains(kw: string): boolean;
    clear(): void;
}