export declare const prepareClasses: (classes: string[]) => string;
export declare const booleanString: (value: boolean) => string;
export declare const toBoolAttr: (value: boolean | string | number) => string;
export declare const toOnOffAttr: (value: boolean | string | number) => string;
export declare const toBoolAttrIfDefined: (value: boolean | string | number | undefined | null) => undefined | string;
export declare const toOnOffAttrIfDefined: (value: boolean | string | number | undefined | null) => undefined | string;
export declare const boolToFocusValue: (value: boolean) => undefined | string;