export declare function hasClassName(el: Element, className: string): boolean;
export declare function addClassName(el: Element, className: string): void;
export declare function removeClassName(el: Element, className: string): void;
export declare function replaceClassName(el: Element, prevClassName: string | null | undefined, nextClassName: string | null | undefined): void;
export declare function toggleClassName(el: Element, className: string): void;
export declare function cleanClassName(className: string | undefined | null): string;
export declare function mergeClassNames(classNames: (string | undefined | null)[]): string;
export declare function classesToSelector(classNames: (string | undefined | null)[]): string;
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