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Add babel runtime version to transform-runtime plugin to reduce bundle size #7726

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merged 2 commits into from
Oct 6, 2019

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topaxi
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@topaxi topaxi commented Sep 24, 2019

(Reopening due to force-push #7725)

By default, babel assumes babel/helpers version 7.0.0-beta.0, this PR explicitly resolves the helpers to match the provide functions.

See: babel/babel#10261

Looking at the code in babel-plugin-transform-runtime/src/index.js it does not seem to be enough to provide an absolute path to the runtime.

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d3dc commented Sep 27, 2019

I can confirm there are several issues with the version of helpers being used. Our bundle size is very bloated thanks to ownKeys and doesn't have some Object.keys polyfills leading to crashes.

All research points to this PR being the fix.

@topaxi topaxi changed the title Add runtime version to transform-runtime plugin Add runtime version to transform-runtime plugin to improve app bundle sizes Oct 4, 2019
@ianschmitz ianschmitz added this to the 3.2.1 milestone Oct 5, 2019
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@topaxi have you verified that this change shrinks your bundle size?

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topaxi commented Oct 6, 2019

Yes, this reduces the filesize of each of our chunks by about 200 bytes after gzip.

@ianschmitz ianschmitz changed the title Add runtime version to transform-runtime plugin to improve app bundle sizes Add babel runtime version to transform-runtime plugin to reduce bundle size Oct 6, 2019
@ianschmitz ianschmitz merged commit ac93f31 into facebook:master Oct 6, 2019
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Thanks @topaxi!

@topaxi topaxi deleted the transform-runtime-version branch October 7, 2019 06:47
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sumanbh commented Oct 11, 2019

@topaxi @ianschmitz Is there a reason we're not doing the same when compiling dependencies here? Just curious.

Edit: Nevermind. Looks like @babel/runtime is excluded from dependencies.

@lock lock bot locked and limited conversation to collaborators Oct 16, 2019
@iansu iansu modified the milestones: 3.2.1, 3.3 Oct 23, 2019
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6 participants