Storybook: Upgrade to @babel/preset-env 7.4.4 with [email protected] is breaking build

[sPaCeMoNk3yIam]

Describe the bug
With @babel/preset-env v7.4.3 and using core-js 3.x explicitly in babel config building storybook worked fine. After upgrading @babel/preset-env to the latest release (being 7.4.4) an error is shown when core-js modules are used.

To Reproduce
Steps to reproduce the behavior:

1. Create a babel config with corejs: { version: 3, proposals: true }
2. Use latest @babel/preset-env v7.4.4
3. build and start storybook
4. See errors like
   Module not found: Error: Can't resolve 'core-js/modules/web.dom-collections.iterator' in ...
Module not found: Error: Can't resolve 'core-js/modules/es.array.concat' in ...

Expected behavior
A storybook build should not fail with latest babel, when doing a bugfix version bump.

System:

• OS: MacOS 10.14.4 (18E226)
• Framework: react
• Version: 5.0.11

Additional context
May be this is also related to https://github.com/storybooks/storybook/issues/6204 but the workaround is not working and wasn't needed with @babel/preset-env v7.4.3.

[Zyzle]

@sPaCeMoNk3yIam Have you been able to come up with a workaround for this issue? I've come up against what looks like the same problem but haven't been able to resolve it.

[csvan]

We currently work around this by adding a hard resolve (in Yarn) to core-js 2.6.5, but that is untenable in the long run. Would be great to see full support for core-js 3, which is also the path Babel is headed.

[shilman]

@csvan Have you tried 5.1.0-beta.0? I believe it contains the full upgrade

[Zyzle]

@shilman @csvan Can confirm upgrading to 5.1.0-beta.0 resolved the issue for us.

[shilman]

Awesome @Zyzle thanks for the confirmation. I'm going to close this issue, but can re-open if it's still a problem for people.

[mrmartineau]

Thanks @shilman, updating all my @storybook dependencies to @5.1.0-beta.1 fixed the build issues for me.

[rpearce]

This is fixed for me, as well. Thanks!

[ndelangen]

Awesome!

[yairEO]

Sadly manually installing latest npm i core-js -D helped. Shame...
It's not good to manually install a dependency or a 3rd-party library such as Storybook. it should properly manage such issues internally