Deps: Remove core-js from most packages #19098
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They use features which our browserslist thinks needs to be polyfilled. I think these can be removed again once (if?) we move them from babel to esbuild.
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Issue: core-js is a large dependency, and it may not be needed any longer in storybook 7, given updated node.js and evergreen browser support.
What I did
Removed direct dependencies on core-js from most packages.
Note: there are a handful of packages which still need core-js, but the features they are polyfilling (RegExp.flags, TypedArray.set, seem to be well-supported in our targeted browsers and node-js versions. And we seem to use
setImmediatesomewhere (which is deprecated), so a core-js polyfill for that ends up in@storybook/router.I wonder if the browserslist needs a little tweaking to avoid some of these. And maybe they can be removed entirely once everything is built with TSUP instead of babel.
How to test
CI shouldn't fail.