import Trie from './trie';
export interface FlashTextOpt {
    ignore?: boolean;
}
export interface BoundaryTestFn {
    test: (c: string) => boolean;
}
export declare type KeyWordObj = {
    [key: string]: string[];
};
export declare const KEYWORD = "__FlashText.js__";
export default class FlashText {
    private option;
    private readonly trie;
    private boundaries;
    private whitespaceChars;
    constructor(opt?: FlashTextOpt);
    get size(): number;
    get _trie(): Trie;
    setBoundaries(r: RegExp | BoundaryTestFn): this;
    setWhiteSpaceChars(c: string[]): this;
    addWhiteSpaceChars(c: string): this;
    addKeyWord(keyword: string, mapped?: string): void;
    addKeyWordsFromArray(keywords: string[], mapped?: string): void;
    addKeyWordsFromObject(obj?: KeyWordObj): void;
    removeKeyWord(keyword: string): boolean;
    removeKeyWordsFromArray(keywords: string[]): void;
    get(keyword: string): any;
    toMap(): any;
    extractKeywords(sentence: string): string | any[];
    replaceKeyWords(sentence: string): string;
    clear(): void;
}
export declare const flashtext: FlashText;