feat: handle externals all-monorepo option

[maximang]

[jayair]

Thanks for the PR!

I'm wondering, can we do this by default for the all option? Would it error out if we traversed up the directories and looked for a root package.json.

[maximang]

Sorry for the late answer, I was in holiday.

I tried using nodeExternals({ additionalModuleDirs: [path.resolve(process.cwd(), "../../node_modules")] }) on a non-monorepo project. I put the project at the top-level directory to be sure it would also work if ../../ doesn't exist. I tested it on Linux and Windows, it worked in both cases.

I will update the PR.

[jayair]

Thanks! We have a test case for the externals that's failing. If we can fix that, I can merge it.

[maximang]

Test fixed