Feature loader

[midweste]

Add support for Sentry's Loader Script (WP_SENTRY_BROWSER_LOADER_URL)

Summary

This PR adds support for using Sentry's Loader Script instead of the bundled SDK for the Browser integration, providing lazy loading capabilities and smaller initial page payloads.

Changes

• Added new WP_SENTRY_BROWSER_LOADER_URL constant to specify a custom loader script URL
• When set, the plugin enqueues the loader script with wp_enqueue_script and configures it via inline sentryOnLoad callback
• Automatically adds data-lazy="no" attribute when tracing or session replay is enabled (since these features require immediate SDK loading)
• Falls back to bundled SDK if loader URL is not set or invalid
• Updated readme.txt with documentation for the new option

How it works

// In wp-config.php
define( 'WP_SENTRY_BROWSER_LOADER_URL', 'https://js.sentry-cdn.com/YOUR_KEY.min.js' );

The plugin will:

1. Enqueue the loader script instead of the bundled SDK
2. Add an inline script with window.sentryOnLoad containing your configuration
3. Apply crossorigin="anonymous" and conditional data-lazy attributes

Benefits

• Smaller initial payload: ~1KB loader vs ~30KB+ bundled SDK
• Lazy loading: SDK only loads when an error occurs (if tracing/replay disabled)
• Self-hosted support: Works with both Sentry.io and self-hosted instances
• Zero breaking changes: Existing configurations continue to work unchanged

Testing

• Verified loader script is correctly enqueued with proper attributes
• Confirmed sentryOnLoad callback initializes Sentry with correct options
• Tested with both Sentry.io and self-hosted Sentry loader URLs
• Verified data-lazy="no" is applied when tracing or replay is enabled

[szepeviktor]

@stayallive Can you lend a click here?

[stayallive]

It's on my list but I still have to look over this a bit. Thanks for your patience.