export class DataProvider {
    /**
     * Data provider: loads and serializes mind data by format.
     * @param {import('./jsmind.js').default} jm - jsMind instance
     */
    constructor(jm: import("./jsmind.js").default);
    jm: import("./jsmind.js").default;
    /** Initialize data provider. */
    init(): void;
    /** Reset data provider state. */
    reset(): void;
    /**
     * Load a Mind from mixed source.
     * @param {import('./jsmind.format.js').NodeTreeFormat|import('./jsmind.format.js').NodeArrayFormat|{meta?:{name:string,author:string,version:string},format:'freemind',data:string}|{meta?:{name:string,author:string,version:string},format:'text',data:string}} mind_data - object with {format,data} or a format-specific payload
     * @returns {import('./jsmind.mind.js').Mind|null}
     */
    load(mind_data: import("./jsmind.format.js").NodeTreeFormat | import("./jsmind.format.js").NodeArrayFormat | {
        meta?: {
            name: string;
            author: string;
            version: string;
        };
        format: "freemind";
        data: string;
    } | {
        meta?: {
            name: string;
            author: string;
            version: string;
        };
        format: "text";
        data: string;
    }): import("./jsmind.mind.js").Mind | null;
    /**
     * Serialize current mind to target format.
     * @param {'node_tree'|'node_array'|'freemind'|'text'} data_format
     * @returns {import('./jsmind.format.js').NodeTreeFormat|import('./jsmind.format.js').NodeArrayFormat|{meta:{name:string,author:string,version:string},format:'freemind',data:string}|{meta:{name:string,author:string,version:string},format:'text',data:string}}
     */
    get_data(data_format: "node_tree" | "node_array" | "freemind" | "text"): import("./jsmind.format.js").NodeTreeFormat | import("./jsmind.format.js").NodeArrayFormat | {
        meta: {
            name: string;
            author: string;
            version: string;
        };
        format: "freemind";
        data: string;
    } | {
        meta: {
            name: string;
            author: string;
            version: string;
        };
        format: "text";
        data: string;
    };
}