cn() utility

1// Minimal class-name joiner. Drops falsy values; flattens arrays.
2// Equivalent to clsx for the subset we need. No tailwind-merge — author
3// the variants so they don't collide, the way shadcn does for cva-defined classes.
4export type ClassValue = string | number | null | undefined | false | ClassValue[]
5 
6export function cn(...inputs: ClassValue[]): string {
7  const out: string[] = []
8  const walk = (v: ClassValue) => {
9    if (!v && v !== 0) return
10    if (Array.isArray(v)) {
11      for (const x of v) walk(x)
12    } else {
13      out.push(String(v))
14    }
15  }
16  for (const v of inputs) walk(v)
17  return out.join(" ")
18}