How do I disable logs from `powersync_db.worker.js` in production?

[nicholaschiang]

In my production web build, I see a ton of undesirable logs from the PowerSync worker in the browser console:

[PowerSync] FINE: 2026-06-25 01:00:59.043: [in] SyncWorkerMessageType.okResponse [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] INFO: 2026-06-25 01:00:59.044: Sync setup: Connecting to endpoint [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] INFO: 2026-06-25 01:00:59.045: Sync setup: Has database, starting sync! [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] INFO: 2026-06-25 01:00:59.341: Starting Rust sync iteration [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] FINE: 2026-06-25 01:00:59.350: Broadcasting sync event: SyncStatus<connected: connecting downloading: false (progress: null) uploading: false lastSyncedAt: 2026-06-25 00:58:21.000 hasSynced: null error: null> [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] FINE: 2026-06-25 01:00:59.355: [in] SyncWorkerMessageType.okResponse [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] FINE: 2026-06-25 01:00:59.470: Broadcasting sync event: SyncStatus<connected: true downloading: false (progress: null) uploading: false lastSyncedAt: 2026-06-25 00:58:21.000 hasSynced: null error: null> [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] FINE: 2026-06-25 01:00:59.477: Broadcasting sync event: SyncStatus<connected: true downloading: true (progress: for total: 0 / 0) uploading: false lastSyncedAt: 2026-06-25 00:58:21.000 hasSynced: null error: null> [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] FINE: 2026-06-25 01:00:59.501: Validated and applied checkpoint [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)
[PowerSync] FINE: 2026-06-25 01:00:59.502: Broadcasting sync event: SyncStatus<connected: true downloading: false (progress: null) uploading: false lastSyncedAt: 2026-06-25 01:00:59.000 hasSynced: null error: null> [powersync_db.worker.js:6097:78](http://localhost:3000/powersync_db.worker.js)

...how do I silence these for my production build?

[simolus3]

PowerSync uses package:logging to emit logs, you can use that package to configure how logs are managed.

If you don't pass a custom logger to PowerSyncDatabase constructors, PowerSync will:

• For debug builds, create it's own independent logger to print everything with level FINE and above.
• For release builds, use Logger('PowerSync') without attaching a log listener to it.

In your case, I assume there's another system using package:logging and listens for records? A reliable way to get PowerSync to shut up would be to use

// Note that this will stop Logger('x') from receiving log messages from Logger('y'). If you listen to logs in your app
// on a non-root logger, check that this is what you want
hierarchicalLoggingEnabled = true;

Logger('PowerSync').level = .INFO;

Alternatively, you can also pass an independent Logger.detached() to PowerSyncDatabase but then you're responsible for listening on that since its logs would not show up in Logger.root.onRecord