Cannot extend from directory containing multiple dots

[DamianGlowala]

Environment

n/a

Reproduction

Using Nuxt, create a layer called e.g. foo.bar.baz and observe that it cannot be extended from.

export default defineNuxtConfig({
  extends: ['./layers/foo.bar.baz'],
})

Describe the bug

Directories with multiple dots are wrongly treat as non-dir ones here

c12/src/loader.ts

Line 382 in 88d9b40

const isDir = !ext || ext === basename(source); /* #71 */

Additional context

No response

Logs

[pi0]

We should probably use fs.stat as alternative fix to 4adcbbe

PR welcome