Problem showing bundling issues with vite >= 2.6

With vite 2.5.10:

yarn build
yarn run v1.22.18
$ tsc && vite build
vite v2.5.10 building for production...
transforming (1) src/index.tsUse of eval is strongly discouraged, as it poses security risks and may cause issues with minification
Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification
Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification
✓ 11 modules transformed.
dist/vite-bundle-size-problem.es.js   2147.03 KiB / brotli: skipped (large chunk)
dist/vite-bundle-size-problem.umd.js   2147.39 KiB / brotli: skipped (large chunk)
✨  Done in 14.95s.

With vite 2.9.8

vite v2.9.8 building for production...
transforming (1) src/index.tsUse of eval is strongly discouraged, as it poses security risks and may cause issues with minification
Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification
Use of eval is strongly discouraged, as it poses security risks and may cause issues with minification
✓ 11 modules transformed.
dist/vite-bundle-size-problem.es.js   3211.96 KiB / gzip: 737.04 KiB

Note that

a) the build does not complete (at least not within 5 minutes or so). b) the ES output file is now 3211.96 KiB compared to 2147.03 KiB

Repro steps

0. run yarn install
1. run yarn build (by default we use vite 2.9.8) note that the build does not terminate and the output file is 3MB
2. change package.json and replace "vite": "~2.9.8" with "vite": "~2.5.10"
3. run yarn install && yarn build and observe the file size is now only 2 MB