export interface IMaskPartConfig {
    maskChar: string;
    allowedChars: RegExp;
}
/**
 * Find boundaries of mask field in specified cursor position.
 *
 * Returns array with start and end index of a field.
 * End index points next character after field (useful for `String.substring`).
 * If values are the same most probably passed cursor position is not a correct value (eg. separator).
 *
 * @param mask
 * @param cursorPosition
 * @param config
 * @return [number, number]
 */
export declare const findMaskFieldBoundariesAtPosition: (mask: string, cursorPosition?: number, config?: Partial<IMaskPartConfig>) => [number, number];
export declare const getValueAtIndex: (mask: string, index: number, config?: Partial<IMaskPartConfig>) => string | null;
export declare function setValueAtIndex(mask: string, index: number, value: string | number, config?: Partial<IMaskPartConfig>): string;
export declare function expandValueAtIndex(mask: string, index: number, config?: Partial<IMaskPartConfig>): string;
export declare const expandMaskValue: (mask: string, cursorPosition: number) => string;