/**
 * @internal
 * Utility for merging class names
 *
 * @example
 * ```ts
 * cls("foo", "bar", true, false, "baz") // "foo bar baz"
 * cls('foo', someCondition && "bar") // "foo bar" or "foo"
 * ```
 */
export declare function cls(...classes: (string | unknown)[]): string;
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