Sentry JS bundle is surprisingly large

[alexgibson]

Description

Webpack gives a warning about the size of our Sentry JS script when compiling:

WARNING in entrypoint size limit: 
The following entrypoint(s) combined asset size exceeds the recommended limit (244 KiB). 
This can impact web performance.
[1] Entrypoints:
[1]   sentry (389 KiB)
[1]       js/sentry.js

Thankfully it compresses down to ~24Kb in production, but this is still suprisingly large for an error reporting lib.

It looks like others have also reported this problem, and it's on Sentry's upcomng roadmap to improve:

• Package size is massive getsentry/sentry-javascript#2707
• Sentry JavaScript v7 Major Release Plan getsentry/sentry-javascript#4240

Filing this issue as a reminder to keep an eye out for updates.

[vladanpaunovic]

You can track this better here getsentry/sentry-javascript#4240

We are targeting this release in May.

[alexgibson]

Looks like Sentry 7.0.0 is released. Tree shaking tips here: https://sentry-docs-git-lms-treeshake-def-integrations.sentry.dev/platforms/javascript/configuration/tree-shaking/

[alexgibson]

Some promising results here following the tree shaking examples linked above:

Uncompressed 336.68kb -> 296.56kb
Minified 77.62kb -> 48.74kb

I do see an issue transpiling 7.0 using babel for older browsers however, which needs some investigating.

[alexgibson]

Filed getsentry/sentry-javascript#5184 for the transpilation issue

[vladanpaunovic]

Thanks for watching over for us @alexgibson!

I saw that getsentry/sentry-javascript/issues/5184 is closed too. Making this one a good candidate for "closed" :)