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Uncaught ReferenceError after upgrade #123

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paulschreiber opened this issue Nov 20, 2023 · 1 comment
Closed

Uncaught ReferenceError after upgrade #123

paulschreiber opened this issue Nov 20, 2023 · 1 comment

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@paulschreiber
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Description

After upgrading from 1.0.30001553 to 1.0.30001563, my React app started failing with this error:

Uncaught ReferenceError: Cannot access 'ROLLBAR_TOKEN' before initialization

This doesn't make a lot of sense, as it's totally unrelated, but git bisect led me to this commit and reverting it caused the problem to go away.
@ai
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ai commented Nov 20, 2023

Very likely that happens because JS polyfills was changed.

caniuse-lite has browsers database for Browserslist queries like last 2 versions. Babel uses Browserslist and on caniuse-lite you will have a different target browsers (npx update-browserslist-db warns you about these changes).

@ai ai closed this as completed Nov 20, 2023
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@ai @paulschreiber