RollupError: "Writable" is not exported by "node:stream", imported by "src/foo.ts".

A really strange error...

`src/foo.ts` imports from Node internal:

```
import type { Writable } from 'node:stream'
```

tsup config:

```json
{
"clean": true,
"sourcemap": true,
"watch": false,
"silent": true,
"entry": [
"src/index.ts"
],
"dts": {
"resolve": true
},
"tsconfig": "tsconfig.build.json",
"outDir": "lib",
"format": [
"cjs",
"esm"
],
"shims": true,
"target": "node18.19.1"
}
```

Marking the `node:stream` package as external fixes the problem.

```json
"external": [
"node:stream"
],
```

Am I doing something wrong?

I have never had to add externals to the list in any other packages before.

Reproduce the RollupError using the supplied tsup configuration, starting with the import in src/foo.ts. Then inspect the configured entry src/index.ts and tsconfig.build.json to determine why node:stream is being bundled; done means establishing the expected handling without relying on an unexplained manual external configuration.

Written by the indexing model from the issue text.