Environment

pnpm 9.15.1
npm 10.8.2
node 22.6.0
Windows 10 PRO

Reproduction

https://github.com/userquin/unbuild-cts-issue

Describe the bug

When using default exports with additional exports d.cts file with wrong default export.

This PR #458 doesn't fix d.ts files and it should.

Additional context

I'm updating unbuild to 3.2.0 in UnoCSS repo, and dts files for node10 and node16 CJS are wrong (we have ESM only and ESM first with dual CJS/ESM packages).

Logs

unbuild-cts-issue@1.0.0 test:attw D:\work\issues\unbuild-cts-issue
attw --pack

unbuild-cts-issue v1.0.0

Build tools:

• @arethetypeswrong/cli@^0.17.2
• typescript@^5.7.2

❗️ The resolved types use export default where the JavaScript file appears to use module.exports =. This will cause TypeScript under the node16 module mode to think an extra .default property access is required, but that will likely fail at runtime. These types should use export = instead of export default. https://github.com/arethetypeswrong/arethetypeswrong.github.io/blob/main/docs/problems/FalseExportDefault.md

┌───────────────────┬──────────────────────────────┐
│                   │ "unbuild-cts-issue"          │
├───────────────────┼──────────────────────────────┤
│ node10            │ ❗️ Incorrect default export │
├───────────────────┼──────────────────────────────┤
│ node16 (from CJS) │ ❗️ Incorrect default export │
├───────────────────┼──────────────────────────────┤
│ node16 (from ESM) │ 🟢 (ESM)                     │
├───────────────────┼──────────────────────────────┤
│ bundler           │ 🟢                           │
└───────────────────┴──────────────────────────────┘

ELIFECYCLE  Command failed with exit code 1.