esbuild fails on `Generating static pages` step in serverless Next.js applications

• mdx-bundler version: 3.1.2
• node version: any (tried 12, 14, and 15.12)
• npm version: 7.6.3

Relevant code or config: repl.it of bug

What you did: Added target: "serverless" to a next.js project with mdx-bundler

What happened:

Reproduction repository: https://replit.com/@TheoBr/mdx-bundler-static-demo#README.md

Problem description: Seems to be an issue with how esbuild is run in next.js’s serverless path. Not functionality I’m super familiar with, I just know that netlify forces it to be enabled. (fwiw I’ve had no issues using this with vercel (see: tt.fm)

Suggested solution: Bug EvanW or Guillermo maybe? I’m lost on this one

[Arcath]

@kentcdodds I was thinking the same thing.

I was thinking this is all it would need:

if(__dirname === "" && !process.env.ESBUILD_BINARY_PATH){
  //FIX
}

That way we fix it if we need to and don’t interferrer with anyones overrides

[kentcdodds]

You know what… The more I think about this, the more I think we should probably support this out of the box 🤔 We know where the esbuild binary should be, so we can set that env variable ourselves if it’s not already set.