Have you worked with NX and cyclic dependencies in monorepos? Why can't lazy-loaded modules be imported into eager modules?

Yes, I have worked with NX and encountered issues with cyclic dependencies in monorepos. In NX, it is important to avoid cycles between libraries, as they complicate building and maintenance.

Regarding importing lazy-loaded modules into eager modules, this is prohibited because eager modules load immediately at application startup, while lazy-loaded modules load only when needed. If an eager module imports a lazy-loaded module, the lazy module will be loaded immediately, which violates the principle of lazy loading and increases the initial bundle size.

Therefore, lazy modules should be isolated and loaded dynamically, and eager modules should not depend on them directly. This helps optimize load times and application performance.