Pin babel-preset-react-app to to core-js minor '3.5' version and add a peer dependency

[Mrman]

• Specified the minor version as recommended by core-js docs
• Removed comment about core-js@3 upgrade
• Added peer dependency on core-js from babel-preset-react-app.

Did some due dilligence and see react-error-overlay and react-scripts both directly depend on babel-preset-react-app but do not have a direct dependency on core-js. They do both have direct dependencies on react-app-polyfill that in turn depends on core-js.

From my testing:

• npm doesn't complain about the peer depenency being unmet, guessing because it sees core-js in the dependency tree from react-app-polyfill
• yarn does warn about the peer dependency being unmet, this seems more correct than npm's behaviour.

Forgive my ignorance but I don't know if babel-preset-react-app is expected to be usable without core-js? If not does that suggest react-scripts and react-error-overlay should have a direct dependency on core-js too?

closes #8875
closes #8779

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[Mrman]

Now the peerDependency on core-js has been added, can this one go as part of the next milestone @ianschmitz? Think it would warrant a major version bump of babel-preset-react-app.

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[Mrman]

PR is not stale, changes to my knowledge are good. Just needs review and release.

Can we get a breaking change and bug fix label added to this PR?

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[Mrman]

PR is not stale :)

[Mrman]

Have had to workaround this issue in another project. @ianschmitz / @iansu Is this something can be considered for the 4.1 milestone as a major version release to babel-preset-react-app?

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[Mrman]

Resolved conflicts. PR is not stale.

[Semigradsky]

Maybe change version to 3.8? :)

[Mrman]

Maybe change version to 3.8? :)

We can go to 3.6 since that is the latest minor version that react-app-polyfill is pulling in

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[Semigradsky]

As I see react-app-polyfill has "core-js": "^3.19.2", in dependencies, so we can change version to 3.19?

[xprommer]

I need corejs 3.17 for my project,
it would be great to update it to 3.19!