Use npm v7 with workspaces for local development and testing

[lukekarrys]

This PR uses npm v7 (with its support of workspaces) for local development and testing. This should only affect local development, and not the generated output from create-react-app. So if I made changes that do affect the output, it is likely a mistake. 😄

Lerna

lerna is still being used for changelog generation and publishing. These two tasks could be replaced with individual tools/scripts, now that npm is responsible for installing and linking dependencies.

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[lukekarrys]

I was running into the same issue as #11306, so I included a similar commit (01f8557) in order to get tests passing further.

[merceyz]

Could you elaborate on why this change is necessary? What is gained from this migration compared to what's already in place?

[mrmckeb]

@merceyz We've been working with the npm team recently, and they've graciously donated time to help us improve internal tooling (this PR is part of that work), and to also improve end user experience (as in #11322) - and of course we'll be giving them our feedback along the way.

[merceyz]

That doesn't answer my questions but alright

[dan-kez]

Hey all! I believe there may be an issue with how build:prod is being invoked as a part of this build.

For example in this e2e build in a recent babel PR we can see the following error

(Copied below for ease of reading)

$ npm run build:prod -w react-error-overlay
npm ERR! missing script: build:prod
npm ERR! 
npm ERR! Did you mean this?
npm ERR!     build

npm ERR! A complete log of this run can be found in:
npm ERR!     /home/runner/.npm/_logs/2021-09-02T13_13_45_399Z-debug.log
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

cc @lukekarrys

edit: apologies just found this fix here babel/babel#13724. Please ignore

[lukekarrys]

@dan-kez Are you using npm@7? The workspaces support used by this repo is only available in npm 7. I added a note to the contributing docs about this, but a better check with a clearer error message would help in this case.

[lukekarrys]

Also if you're using node 14 in a CI environment, you'll need to manually install npm 7 like I did here: https://github.com/facebook/create-react-app/pull/11304/files#diff-5c3fa597431eda03ac3339ae6bf7f05e1a50d6fc7333679ec38e21b337cb6721R14-R15

[dan-kez]

@dan-kez Are you using npm@7? The workspaces support used by this repo is only available in npm 7. I added a note to the contributing docs about this, but a better check with a clearer error message would help in this case.

It looks like this was the issue. nicolo-ribaudo fixed this in babel/babel#13724

Thanks for the prompt response and apologies for posting before digging into it further!