Ignore unsupported Top-level await and pass it anyway

[theseyan]

I'm bundling with format CJS for Bun, which supports both esm and cjs Top level await in the same file.
But due to esbuild having a non-configurable error on using TLAs when format cjs is enabled, it's not currently possible to make use of Bun's TLA features.

I request the addition of a configuration option such as ignoreUnsupportedTLA which will allow users to manually pass through TLAs that would normally be blocked with cjs.

[evanw]

I'm not at all familiar with Bun. But I did try using top-level await in a CommonJS file and it doesn't appear to be supported? Here's what I tried:

• entry.js:

  console.log(require('./cjs-tla.js'))

• cjs-tla.js:

  await new Promise(r => setTimeout(r, 1000))
  module.exports = 123

When running this with bun run entry.js I get this error:

1 | __require as require
2 | } from "bun:wrap";
3 | 
4 | console.log(import.meta.require("./cjs-tla.js"));
                       ^
TypeError: require() async module "./cjs-tla.js" is unsupported
      at ./entry.js:1:20

This is not surprising because the CommonJS module format doesn't support top-level await.

[theseyan]

I seem to be able to reproduce this too, but I could've sworn I saw Bun do this in a previous version.
Anyway, I should've tested it first, thank you for taking a look!