/**
 * Conditional class name assembly utility.
 *
 * Accepts strings and objects. For objects, includes the key as a class name
 * if the value is truthy. Filters falsy values. Joins with space.
 *
 * @example
 * cx('tdds-button', { 'tdds-button--primary': true, 'tdds-button--disabled': false })
 * // => 'tdds-button tdds-button--primary'
 */
export declare function cx(...args: Array<string | Record<string, boolean | undefined> | undefined | null | false>): string;
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