export declare class DOI {
    private readonly _doi;
    constructor(doi: string);
    get doi(): string;
    static isDOI(text: string): boolean;
    static getDOIFromString(doi: string): DOI;
    static fromJSON(serialized: string): DOI;
    toURL(): string;
    toString(): string;
    toObject(): {
        doi: string;
    };
}