Set fixed version of @babel/runtime to 7.0.0-beta.55

[abotteram]

Description

Set the version of @babel/runtime to the latest working version for @WordPress packages.

Fixes: #8580

How has this been tested?

Screenshots

Types of changes

Bug fix

Checklist:

• My code is tested.
• My code follows the WordPress code style.

[moorscode]

This should be a temporary fix. Preferred to set the minimal required version to 5.6 and adjust the code to work with the breaking changes introduced in that version.

[youknowriad]

What would be the fix if we want to upgrade to the last version?

[gziolo]

Yes, it would be nice to bump to the latest Babel version instead :)

[ntwb]

Why not upgrade the underlying issue?

i.e upgrade from @babel/runtime to @babel/runtime-corejs2

See also https://babeljs.io/docs/en/next/babel-runtime

[abotteram]

@ntwb @gziolo @youknowriad but we should also set a fixed version for babel packages as long as it is in beta.

[ntwb]

@xyfi It has been in beta for quite some time and we are using beta features I believe, @gziolo can also explain why the ^ caret is used, I believe it is a Lerna v3 functionality we are able to leverage that would not be typically used in a single repo Node.js project.

[gziolo]

In general, we want to use sem ver for packages to make them more flexible when integrating with other projects. However in case of Babel, we probably should avoid doing that because they are introducing breaking changes :(