/**
 * Joins the class names an element resolved to, dropping the ones that are not there.
 *
 * Deliberately not a dependency: this package has exactly one runtime dependency (the design tokens)
 * and adding a second for six lines would be a poor trade for every browser program that bundles it.
 */
export function classNames(...values: readonly (string | undefined | false)[]): string {
  return values
    .filter((value): value is string => typeof value === "string" && value !== "")
    .join(" ");
}