Add PostHog sourcemap publishing (ENG-460)

[devin-ai-integration]

PostHog Sourcemap Publishing

This PR implements sourcemap publishing to PostHog during our application build process to enhance error tracking capabilities. It allows PostHog to properly symbolicate minified JavaScript errors in production, showing accurate file names, line numbers, and function names in error stack traces.

Changes:

• Added productionBrowserSourceMaps: true to Next.js config to enable sourcemap generation in production builds
• Created new script scripts/publish-sourcemaps-to-posthog.js to find and upload sourcemaps to PostHog
• Updated package.json postbuild script to include sourcemap publishing
• Optimized sourcemap publishing to prevent memory issues
• Removed unnecessary instrumentationHook option from next.config.mjs

Design Decisions:

• Only uploads sourcemaps in production environment
• Uses existing POSTHOG_API_KEY for API authentication
• Logs errors but doesn't fail the build if sourcemap upload fails
• Uses timestamp-based versioning to ensure sourcemaps match deployed code
• Implements memory-efficient strategies:
  • Stream-based file processing
  • Batch processing for sourcemap uploads
  • File size filtering to prevent memory exhaustion
  • Increased Node.js memory limit to 4GB

Testing:

• Verified that the script runs correctly during build process
• Confirmed sourcemaps are generated and found by the script
• Tested error handling to ensure build doesn't fail on upload errors

Notes:

• The failing test in analytics.do package is unrelated to this PR and should be addressed separately

Fixes Linear Ticket: ENG-460

Link to Devin run: https://app.devin.ai/sessions/5df7812de04b424e9dfe102d26e3ba69

[linear]

ENG-460 Add sourcemap publish to Posthog in build step

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Name	Status	Preview	Comments	Updated (UTC)
ai	❌ Failed (Inspect)			Apr 14, 2025 7:32am

[devin-ai-integration]

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