interface Option {
    strict?: boolean;
}
interface VerifyOption {
    check_digit?: boolean;
}
/**
 * Verify ISBN string format and check digit
 */
export default class {
    #private;
    /**
     * @param isbn - ISBN value to check
     * @param options - Characteristics related to the handling of ISBN values
     */
    constructor(isbn: string, options?: Readonly<Option>);
    /**
     * Alias of `verify({ check_digit: true })`
     *
     * @returns `true` if both format and check digit are correct
     */
    isValid(): boolean;
    /**
     * Whether it is a current standard (13 digit) ISBN or not
     *
     * @param options - Characteristics about the check item
     *
     * @returns `true` for current standard (13 digit) ISBN
     */
    isIsbn13(options?: Readonly<VerifyOption>): boolean;
    /**
     * Whether it is a old standard (10 digit) ISBN or not
     *
     * @param options - Characteristics about the check item
     *
     * @returns `true` for old standard (10 digit) ISBN
     */
    isIsbn10(options?: Readonly<VerifyOption>): boolean;
    /**
     * Verify format, optionally check digit
     *
     * @param options - Characteristics about the check item
     *
     * @returns `true` if format are correct
     */
    verify(options?: Readonly<VerifyOption>): boolean;
}
export {};
//# sourceMappingURL=ISBN.d.ts.map