If the target option is 'es5' and the format option is 'esm', the es6 syntax is like '?? 'will not be translated

[keer-tea]

If the target option is 'es5' and the format option is 'esm', the es6 syntax is like '?? 'will not be translated.

Here's an example: https://stackblitz.com/edit/stackblitz-starters-9hw3hg?file=tsup.config.ts

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[haydnhkim]

check out v8.0.2!