type QBemConditionalKeys = string | {
    [key: string]: boolean;
};
type ClassesInput = QBemConditionalKeys[];
type BlockModifiers = QBemConditionalKeys[] | undefined | null;
declare class QBem {
    private _b;
    constructor(block: string);
    block(modifiers?: BlockModifiers, ...classes: ClassesInput): string;
    element(element: string, modifiers?: BlockModifiers, ...classes: ClassesInput): string;
    elem(element: string, modifiers?: BlockModifiers, ...classes: ClassesInput): string;
    static modifiers(base: string, ...modifiers: QBemConditionalKeys[]): string;
    static classes(...classes: ClassesInput): string;
}

export { QBem, QBem as default };