Canary build of packages using CodeSandbox CI + mini repl

[hzoo]

Done with @nicolo-ribaudo! Got to learn more about Next, CodeSandbox, babel-standalone 😄

Did some tests earlier on local fork hzoo#3

Current Babel template (forked @CompuIves one in #10639): https://codesandbox.io/s/babel-repl-9d0wg

• not using babel-standalone since I don't want to bundle (takes too long), so it just publishes the built files
• we just manually required all the plugins/presets so they are available

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cc @CompuIves

Integrating this got me thinking about some feature requests:

• being able to change the codesandbox bot comment
• can you programmatically generate templates based on the PR

[babel-bot]

Build successful! You can test your changes in the REPL here: https://babeljs.io/repl/build/21304/

[JLHwung]

Can we just run build? The build-no-bundle run babel on every package while build will rollup babel-parsers.

[nicolo-ribaudo]

The problem is that build was too slow and froze codesandbox

[hzoo]

yeah we purposely didn't because we don't need it in this case, and it was too slow for some reason: https://ci.codesandbox.io/status/hzoo/babel/pr/1

[JLHwung]

I guess it comes from building babel-standalone.

An ugly workaround is BABEL_COVERAGE=true make bootstrap, which will skip building standalone.

[nicolo-ribaudo]

Henry, do you remember that thing about ✔️s before merging PRs? 😛

Anyway, consider me as having approved this!

[hzoo]

Oh yeah I was assuming that, but noted 👍