/**
 * Joins class names, dropping blanks.
 *
 * CSS-module lookups type as `string | undefined` under
 * `noUncheckedIndexedAccess`, so this is where that gets absorbed instead of
 * weakening the flag.
 */
export const cx = (...parts: (string | false | undefined)[]): string =>
  parts.filter((p): p is string => typeof p === "string" && p !== "").join(" ");