Reproduction link or steps

Import a json which is marked as external:

import test from '/test.json' with { type: "json" };

export default defineConfig({
  ...,
  build: {
   rollupOptions: {
    external: [/test\.json/]
   }
  }
})

What is expected?

Externals remain with their original with clause, i.e. import test from '/test.json' with { type: "json" };

What is actually happening?

import test from '/test.json'; is emitted, causing unexpected mime errors

System Info

System:
    OS: Linux 6.12 Void
    Container: Yes
    Shell: 4.3.3 - /usr/bin/fish
  Binaries:
    Node: 24.12.0 - /usr/sbin/node
    pnpm: 10.26.2 - /usr/sbin/pnpm
  Browsers:
    Firefox: 147.0.2
    Firefox Developer Edition: 147.0.2

Any additional comments?

Currently workaround is:

const { default: product_list } = await import('/product_list.json', { with: { type: "json" } });