Way to disable source-maps in production.

[smitpatel1010]

I wanted to disable sourceMaps generation because of slowest webpack build time.

Is there any better way to disable source-maps with withSentryConfig in @sentry/nextjs.

withSentryConfig overrides webpack config passed from next.config.js

I had to disable it after withSentryConfig and had to handle nextConfig as a function.