chore: Update tsconfig target to ES2019 #3986
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## main #3986 +/- ##
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- Coverage 97.26% 96.99% -0.28%
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Files 861 861
Lines 25469 25209 -260
Branches 9095 9093 -2
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- Hits 24772 24451 -321
- Misses 650 752 +102
+ Partials 47 6 -41 ☔ View full report in Codecov by Sentry. 🚀 New features to boost your workflow:
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All targeted browsers support ES2021 syntax. This change provides an immediate bundle size reduction, with the potential for further gains if code is rewritten to take advantage of optional chaining and nullish coalescing. * Optional chaining: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Optional_chaining#browser_compatibility * Nullish coalescing: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Nullish_coalescing#browser_compatibility
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just-boris
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Nov 12, 2025
NathanZlion
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Nov 12, 2025
ngynmt
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Jan 5, 2026
Co-authored-by: Trevor Burnham <[email protected]>
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Description
This PR changes the TypeScript target from the current setting to "ES2019" instead of "ES2021" (as proposed in PR #3801). This is to address build failures in the dry run while still improving TypeScript compatibility.
The change is similar to what was done in the component-toolkit repository (PR #169), where changing to ES2019 was successful without causing downstream failures with Webpack 4 compatibility.
As part of this work, I reached out to the PolarisReactFileUpload team, deprecated the package, and added the fix.
Related links, issue #, if available:
Original PR with ES2021 target (to be closed): #3801
Similar successful change in component-toolkit: cloudscape-design/component-toolkit#169
Successful dry run build: 7595551348
How has this been tested?
Review checklist
The following items are to be evaluated by the author(s) and the reviewer(s).
Correctness
CONTRIBUTING.md.CONTRIBUTING.md.Security
checkSafeUrlfunction.Testing
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