`sentrySvelteKit` loads Vite config in the wrong mode

[giacomoran]

Is there an existing issue for this?

• I have checked for existing issues https://github.com/getsentry/sentry-javascript/issues
• I have reviewed the documentation https://docs.sentry.io/
• I am using the latest SDK release https://github.com/getsentry/sentry-javascript/releases

How do you use Sentry?

Sentry Saas (sentry.io)

Which SDK are you using?

@sentry/sveltekit

SDK Version

9.1.0

Framework Version

2.16.0

Link to Sentry event

No response

Reproduction Example/SDK Setup

https://github.com/giacomoran/sveltekit-sentry-vite-config

Steps to Reproduce

1. Create SvelteKit project
2. Add @sentry/sveltekit as dependency
3. Add the sentrySvelteKit plugin to Vite config
4. Log the mode in which the Vite config is loaded
5. Run vite build --mode staging

Expected Result

Every time the Vite config is loaded, the mode is staging.

Actual Result

When the sentrySvelteKit plugin loads the Vite config, the mode is production instead of staging.

Example output:

❯ bun vite build --mode staging

***********
Vite command=build mode=staging
***********


***********
Vite command=build mode=production
***********

[sentry-vite-plugin] Warning: No auth token provided. Will not create release. Please set the `authToken` option. You can find information on how to generate a Sentry auth token here: https://docs.sentry.io/api/auth/
[sentry-vite-plugin] Warning: No auth token provided. Will not upload source maps. Please set the `authToken` option. You can find information on how to generate a Sentry auth token here: https://docs.sentry.io/api/auth/
[sentry-vite-plugin] Warning: No auth token provided. Will not create release. Please set the `authToken` option. You can find information on how to generate a Sentry auth token here: https://docs.sentry.io/api/auth/
[sentry-vite-plugin] Warning: No auth token provided. Will not upload source maps. Please set the `authToken` option. You can find information on how to generate a Sentry auth token here: https://docs.sentry.io/api/auth/
vite v6.1.0 building SSR bundle for staging...
[sentry-vite-plugin] Info: Sending telemetry data on issues and performance to Sentry. To disable telemetry, set `options.telemetry` to `false`.
✓ 189 modules transformed.

***********
Vite command=build mode=staging
***********

[sentry-vite-plugin] Warning: No auth token provided. Will not create release. Please set the `authToken` option. You can find information on how to generate a Sentry auth token here: https://docs.sentry.io/api/auth/
[sentry-vite-plugin] Warning: No auth token provided. Will not upload source maps. Please set the `authToken` option. You can find information on how to generate a Sentry auth token here: https://docs.sentry.io/api/auth/
vite v6.1.0 building for staging...
[sentry-vite-plugin] Info: Sending telemetry data on issues and performance to Sentry. To disable telemetry, set `options.telemetry` to `false`.
✓ 173 modules transformed.
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✓ built in 334ms
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✓ built in 1.60s

Run npm run preview to preview your production build locally.

> Using @sveltejs/adapter-auto
  Could not detect a supported production environment. See https://svelte.dev/docs/kit/adapters to learn how to configure your app to run on the platform of your choosing
  ✔ done

[Lms24]

Hi @giacomoran thanks for reporting! Hmm yeah this looks like a consequence of #14886 (damn, never thought this change would be so problematic). We need to check if we can detect the mode dynamically. Otherwise I'm afraid we need to re-think our approach. I'll take a look.

[Lms24]

Quick update: We decided to rework the source map setting extraction logic to use Vite's provided config hook instead of calling loadConfigFromFile. This however, requires a change in our bundler plugins so that we can pass in an option as a promise. I already opened

• feat(core): Accept and await a promise in sourcemaps.filesToDeleteAfterUpload sentry-javascript-bundler-plugins#677 to make the change in our core (vite) plugin
• fix(sveltekit): Avoid loading vite config to determine source maps setting #15440 which removes the loadConfigFromFile call from the SvelteKit plugin

This should be released in the next days.

[github-actions]

A PR closing this issue has just been released 🚀

This issue was referenced by PR #15440, which was included in the 9.2.0 release.