feat(browser): Include Spotlight in development bundles

[timfish]

This PR:

• Splits the browser build output into separate development and production builds
• References these two builds in the package.json exports
• Adds a Rollup plugin to production builds which can strip out code wrapped with development-only magic comments
• Adds the spotlight integration to the default integrations in development mode only
• Also adds this plugin for browser bundles so spotlight doesn't get included in CDN bundles

Vite and Webpack will automatically include Spotlight in development/production mode and it is excluded in production. Unfortunately, Rollup will not select development unless you set the exportConditions for @rollup/plugin-node-resolve

[Lms24]

This looks really promising, thanks Tim!

(I realize this is still in draft so feel free to ignore this review if you're still planning on making changes)

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	24.6 kB	+0.03%	+6 B 🔺
@sentry/browser - with treeshaking flags	23.09 kB	+0.03%	+6 B 🔺
@sentry/browser (incl. Tracing)	41.23 kB	+0.01%	+4 B 🔺
@sentry/browser (incl. Tracing, Profiling)	45.51 kB	+0.02%	+7 B 🔺
@sentry/browser (incl. Tracing, Replay)	79.7 kB	+0.01%	+4 B 🔺
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	69.38 kB	+0.01%	+6 B 🔺
@sentry/browser (incl. Tracing, Replay with Canvas)	84.4 kB	+0.01%	+1 B 🔺
@sentry/browser (incl. Tracing, Replay, Feedback)	96.57 kB	+0.01%	+5 B 🔺
@sentry/browser (incl. Feedback)	41.27 kB	+0.02%	+7 B 🔺
@sentry/browser (incl. sendFeedback)	29.27 kB	+0.03%	+7 B 🔺
@sentry/browser (incl. FeedbackAsync)	34.2 kB	+0.02%	+5 B 🔺
@sentry/react	26.29 kB	-0.04%	-8 B 🔽
@sentry/react (incl. Tracing)	43.19 kB	-0.06%	-23 B 🔽
@sentry/vue	29.08 kB	+0.03%	+6 B 🔺
@sentry/vue (incl. Tracing)	43 kB	+0.01%	+4 B 🔺
@sentry/svelte	24.61 kB	+0.03%	+5 B 🔺
CDN Bundle	26.89 kB	+0.03%	+7 B 🔺
CDN Bundle (incl. Tracing)	41.78 kB	+0.01%	+2 B 🔺
CDN Bundle (incl. Tracing, Replay)	78.3 kB	+0.01%	+2 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback)	83.77 kB	+0.01%	+1 B 🔺
CDN Bundle - uncompressed	78.86 kB	+0.02%	+14 B 🔺
CDN Bundle (incl. Tracing) - uncompressed	123.98 kB	+0.02%	+14 B 🔺
CDN Bundle (incl. Tracing, Replay) - uncompressed	240.01 kB	+0.01%	+14 B 🔺
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	252.77 kB	+0.01%	+14 B 🔺
@sentry/nextjs (client)	45.31 kB	+0.02%	+6 B 🔺
@sentry/sveltekit (client)	41.61 kB	+0.01%	+3 B 🔺
@sentry/node-core	50.76 kB	-	-
@sentry/node	157.82 kB	+0.01%	+1 B 🔺
@sentry/node - without tracing	92.64 kB	-	-
@sentry/aws-serverless	106.37 kB	-	-

View base workflow run

[timfish]

Needs some tests to confirm Spotlight actually works in dev mode...

[BYK]

How hard would it be to fill this value from the env variables? I'm okay with trying all variants like PUBLIC_SENTRY_SPOTLIGHT or VITE_SENTRY_SPOTLIGHT etc.

Happy to do this in a follow up too.

[timfish]

Yeah probably best in a follow up PR. If we can keep it between the magic comments it'll all get striped out!