Weird error when bundling Ajv

[fralonra]

Hi all,

I have been working on a project with Ajv, and I used spack to bundle the code but found a weird bug.

The following is the minimum codebase to reproduce the bug:

entry.js:

import './ajv'

ajv.js:

import Ajv from 'ajv'

console.log(Ajv)

The console would print out Uncaught ReferenceError: Ajv is not defined.

The spack.config.js has no any extra configuration but only entry and output.

However, if I use Ajv directly in the entry file, the error is gone.

The version of the module in the project:
@swc/cli: 0.1.57
@swc/core: 1.2.242
ajv: 8.11.0

I can't figure out why this happened and whether there are more packages with similar issue.
Thanks if any info provided!

Edited
Here is an example without Ajv:

entry.js

import './module1'

module1.js

import m from './module' // `const m = require('./module').default` will not fail

console.log(m)

module2.js

module.exports = function m() {}

The above code would give this: Uncaught ReferenceError: __swcpack_require__ is not defined

I think the key point is that to import a CommonJs module in a ES6 module file (not the entry file).