Is it possible for mjs to do process.mainModule === module?

[ratson]

I find #299 talking about exposing process.mainModule, but could not find an example using it.

When I tried node -r esm main.mjs

import _ from 'lodash'

const { sum } = _

export default sum

if (process.mainModule === module) {
  console.log(sum([1, 2]))
}

it gives ReferenceError: module is not defined

Is this use case not supported?

[jdalton]

Hi @ratson!

What version of @std/esm or esm are you using?

[ratson]

How can I forget this. I am testing it with esm "^3.0.6".

[jdalton]

Thanks @ratson!

In esm the .mjs file is locked down:

🔒 .mjs files are limited to basic functionality without support for esm options.

So to enable this you'll need to use .js.

[ratson]

Thanks, @jdalton I got it working with node -r esm main.js.
Is that mean there is no equivalent for .mjs?

[jdalton]

Is that mean there is no equivalent for .mjs?

Correct. .mjs is not fully baked yet so support is limited.
There is currently no process.mainModule support in .mjs.