cjs option prevents modern file

[ozum]

Hi,

Using version 0.12.0-next.6,

src/x.ts file:

export async function x(a:number): Promise<number> {
  return a + 1;
}

microbundle -f modern: x.modern.js file contains async.
microbundle: Creates x.modern.js file among others, but it does not contain async.
microbundle -f modern,es,umd: x.modern.js contains async.
microbundle -f modern,es,cjs,umd: x.modern.js does not contain async.

According to last 2 examples, problem seems to related cjs option.

Thanks,

[ForsakenHarmony]

interesting issue

[developit]

Ah I hadn't noticed this issue - it's the same as #582 and #568.