The next-config package is a configuration package for Next.js. It is used to configure the Next.js app and is located in the packages/next-config directory.

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Images

The package configures Next.js image optimization to support AVIF and WebP formats. It also sets up remote patterns to allow loading images from Clerk securely (i.e. profile images).

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Prisma

For server-side builds, the package includes the Prisma plugin which helps handle Prisma in a Next.js monorepo setup correctly.

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Rewrites

The package configures URL rewrites to handle PostHog analytics integration:
  • /ingest/static/:path* routes to PostHog’s static assets
  • /ingest/:path* routes to the main PostHog ingestion endpoint
  • /ingest/decide routes to PostHog’s feature flags endpoint
It also enables skipTrailingSlashRedirect to properly support PostHog API requests with trailing slashes.

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OpenTelemetry

The package includes a fix for OpenTelemetry instrumentation warnings by configuring webpack to ignore warnings from @opentelemetry/instrumentation packages. The configuration can optionally be wrapped with withAnalyzer() to enable bundle analysis capabilities.