feat: add option for interop default in cjs

[sxzz]

Description

Introduce a new option cjsInterop.

In the CJS file, if there's only an export default, then make it to module.exports = _default, instead of module.exports = { default: _default }.

For dts files, it will replace export { _default as default } with export = _default

Usage

// before
const mod = require('something').default

// after
const mod = require('something')

Relate issues

Closes #572

Additional Information

It would be really helpful for removing tons of post-build scripts.

sucrase also had an option enableLegacyBabel5ModuleInterop, with the same effect.

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Name	Status	Preview	Comments	Updated (UTC)
tsup	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 29, 2023 7:22am

[egoist]

Can you also update the docs?

[sxzz]

@egoist Done

[github-actions]

🎉 This PR is included in version 7.2.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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