Experimental module output drops external import assertions

[laverdet]

Bug report

What is the current behavior?
When using the experimental module output format import assertions are not emitted in the output.

This is related to #2933, @alexander-akait requested I open a new issue.

If the current behavior is a bug, please provide the steps to reproduce.
main.js

import test from "test" assert { type: "json" };
console.log(test);

package.json

{
  "name": "test",
  "type": "module",
  "dependencies": {
    "webpack": "^5.74.0",
    "webpack-cli": "^4.10.0"
  }
}

webpack.config.js

export default {
	entry: "./main.js",
	mode: "development",
	experiments: {
		outputModule: true,
	},
	externals: [
		"test",
	],
}

At the top of dist/main.mjs we get import * as __WEBPACK_EXTERNAL_MODULE_test__ from "test"; which will make applications fail under runtimes which expect the assertion (nodejs v18).

What is the expected behavior?
The assertion should be preserved in the output.

Other relevant information:
webpack version: 5.74.0
Node.js version: 18.9.0

[webpack-bot]

This issue had no activity for at least three months.

It's subject to automatic issue closing if there is no activity in the next 15 days.

[alexander-akait]

bump

[pablomendezroyo]

Same issue

[webpack-bot]

Issue was closed because of inactivity.

If you think this is still a valid issue, please file a new issue with additional information.

[alexander-akait]

Marked as low because it is still on stage: 2 https://github.com/tc39/proposal-import-attributes and changed

[laverdet]

@alexander-akait should this be reopened?