Importing EntityManager fails when using webpack

[sayav]

Describe the bug
I've got an issue with webpack not being able to dynamically import '@mikro-orm/knex' or '@mikro-orm/mongodb' in the whenModuleAvailable function. Since these are imported as enums (e.g. import(EntityManagerModuleName.Knex)) webpack does not bundle these modules. It's possible to fix this by importing with strings import("@mikro-orm/knex"). I can write a pull request if this would help :)

Versions

Dependency	Version
node	14
typescript	4.1.6
mikro-orm	5.x

[B4nan]

Feel free to PR this, this particular piece of code also came from someone else, I don't really like that enum there anyway.

[B4nan]

Will you have time for this during today? I'd like to ship v5 in few hours, will be happy to look into it myself right now, if you haven't started already.

[sayav]

I can have it done today for sure

[B4nan]

Already started, so will push what I have in a minute and feel free to improve on that :]

[sayav]

Oh sorry I missed that message. Feel free to look at the pull request.

[B4nan]

I see we ended up with quite similar approach, mine being a less verbose I guess.