Use export assignment

[G-Rath]

@SimenB I probably spent more time than I should, but hey least I know a lot more about babel :D

I'll make a PR into jest soon, once I've convinced my laptop to play nice (and once I've figured out how to install the package...).

[G-Rath]

@SimenB would you be able to recommend a good look to learn how to do mono-repos to make a PR for this into jest?

I've gotten the repo forked & setup locally, w/ all but two tests passing, but I've never worked w/ a mono-repo before, & jest is a big one 😬

I'm keen to make the PR myself, as I'm wanting to take a crack at 8330 after I've finished the TS conversation here (as a bit of a "break" before jumping into the open issues here).

[SimenB]

A monorepo isn't anything super special, and contributing.md should have the details on how to work with the code base. I don't know of any guides or blog posts, so I guess my googling would be as good as yours 🙂 Any particular questions?

w/ all but two tests passing

If those are for mercurial (hg), don't worry about them. They fail for me as well. I think you need some specific version of mercurial installed, but I haven't bothered to look into it

[G-Rath]

A monorepo isn't anything super special, and contributing.md should have the details on how to work with the code base

Yeah, I've got it all setup & working, but the one thing contributing.md doesn't covert is adding new packages:

g-rath@CINDY:/c/Users/G-Rath/workspace/projects-oss/jest$ yarn add -D babel-plugin-replace-ts-export-assignment
yarn add v1.17.3
error Running this command will add the dependency to the workspace root rather than the workspace itself, which might not be what you want - if you really meant it, make it explicit by running this command again with the -W flag (or --ignore-workspace-root-check).
info Visit https://yarnpkg.com/en/docs/cli/add for documentation about this command.

I saw that and decided to bail for now, in favor of reading up on how dependencies are handled in monorepos.

So that's pretty much my main question: how do I add new dependencies?

If those are for mercurial (hg), don't worry about them

They were, which is exactly why I ignored them 😄 I figured if they were really failing outside my environment, someone would already be handling it.

[SimenB]

Aha! Yeah, just do what the error suggests, add the -W flag 🙂

[G-Rath]

Cheers, worked as expected - I'm now running the 8min+ test suite 😬

I'll carry on working on this stuff while pondering if I should have called it babel-plugin-typescript-replace-export-assignment 😕

---

Just to complete my knowledge: Since packages don't have their own lock files, am I correct in thinking that adding a dep in a "package" works by the normal npm i/yarn add, which lerna intercepts & redirects/applies/magically-teleports into the root lock file?

[SimenB]

You must use yarn, but yeah, it's added to the root lockfile. This is because we use yarn workspaces: https://yarnpkg.com/lang/en/docs/workspaces/. Jest uses lerna for publishing, not for dependency management 🙂

[SimenB]

🎉 This PR is included in version 22.15.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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