fix: reduce size of ESM packages

[semoal]

No description provided.

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[github-actions]

size-limit report 📦

Path	Size
./packages/core/build/cjs/core.production.min.js	2.78 KB (0%)
./packages/detect-locale/build/cjs/detect-locale.production.min.js	798 B (0%)
./packages/react/build/cjs/react.production.min.js	4.85 KB (0%)
./packages/core/build/esm/index.js	2.75 KB (+100% 🔺)
./packages/core/build/esm/dev.js	7.01 KB (+100% 🔺)
./packages/detect-locale/build/esm/index.js	852 B (+100% 🔺)
./packages/react/build/esm/index.js	4.83 KB (+100% 🔺)

[codecov]

Codecov Report

Merging #1066 (c557fdc) into main (f95a467) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1066   +/-   ##
=======================================
  Coverage   83.20%   83.20%           
=======================================
  Files          53       53           
  Lines        1620     1620           
  Branches      441      441           
=======================================
  Hits         1348     1348           
  Misses        159      159           
  Partials      113      113           

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