Support native esm modules. about micro

[leerob]

#448

[dbo]

@leerob The patch I submitted supports esm in a much more complete way, looking up the package's type like node.js does instead of urging to use the .mjs extension. Please consider it.

[leerob]

Would you be open to adding a PR with a test? Happy to review and merge it.

[pmbanugo]

@leerob What do you think about reopening this and solving it after we merge #458 ?

[leerob]

Yeah I'm onboard.

[TooTallNate]

Why not just always use await import()?

[leerob]

I'm good with that as well, especially since we're doing a major version bump.

[pmbanugo]

Since we're using TS now, that gets transpiled to using require statements. We already use await import

micro/packages/micro/src/lib/handler.ts

Line 8 in 8d2ca07

mod = await import(file);

It was not a straightforward process to get that working the last time I tried. I plan to try a different solution when I get some time in the near future.

[electerious]

Is it correct that I currently can't use micro together with an ES Module / "type": "module"? Is there a recommended workaround or is it better to wait as this will be resolved soon?

[pmbanugo]

@electerious If you're not using micro programmatically then the cli will fail when processing ESM files. If you want to use ESM, then you can use it this way:

//programmatic usage

const micro = require('micro')
 
const server = micro(async (req, res) => {
  return 'Hello world'
})
 
server.listen(3000)

There would be a fix to load ESM files through the CLI in the near future.