require.main !== module (node compat)

[AgentEnder]

What version of Bun is running?

0.5.6

What platform is your computer?

Linux 5.10.16.3-microsoft-standard-WSL2 x86_64 x86_64

What steps can reproduce the bug?

Try to run this script w/ bun:

if (require.main === module) {
	console.log('Running as main')
} else {
    console.log('required by other module')
}

What is the expected behavior?

The first statement is logged

What do you see instead?

The second statement is logged

Additional information

This was found when testing compatibility with Nx encapsulated installs, as an experiment to see if bun could run Nx well. So far, this and #401 are two "blockers" that I've found.

[Jarred-Sumner]

In the current implementation of require, this wouldn't work (CJS modules share the same runtime code as in browsers, which would be one of the things that need to change to support this)

[AgentEnder]

Could it be something that is changed when transpiling to the web-compatible format?

In that format would import.meta.url work?

E.g. https://stackoverflow.com/questions/57838022/detect-whether-es-module-is-run-from-command-line-in-node

[birkskyum]

Working now:

➜ bun --bun index.ts
Running as main