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GitHub Issue: React Server-Side Rendering Error in Production Build

Title: Production build fails with "Element type is invalid" during React SSR

Labels: bug, build, reflex

Assignees: @aaronsteers

Description:

Problem

The reflex export --frontend-only command fails during the production build with a React server-side rendering error. This issue was discovered while setting up CI/CD workflows.

Error Details

Error: Element type is invalid: expected a string (for built-in components) or a class/function (for composite components) but got: object.

Full error context:

  • Command: uv run reflex export --frontend-only
  • Build Tool: React Router with Rolldown/Vite
  • Phase: Server-side rendering during prerendering
  • Exit Code: 1

Impact

  • Production builds cannot be completed
  • CI build step had to be temporarily removed
  • Application works correctly in development mode

Root Cause Analysis

The error occurs during the prerendering phase when React Router tries to server-render the application. The error suggests that a React component is receiving an object instead of a valid component type (string or function).

Potential causes:

  1. Import/Export Issues: A component might be imported incorrectly (e.g., importing a module object instead of the component itself)
  2. Reflex Component Registration: Issues with how Reflex components are registered or exported
  3. Dynamic Imports: Problems with dynamic component loading during SSR
  4. Component Definition: A component might be defined as an object instead of a function/class

Investigation Steps

  • Check all component imports in the main application file
  • Verify Reflex component definitions and exports
  • Test with a minimal component setup to isolate the issue
  • Review Reflex documentation for SSR-specific requirements
  • Check if the issue is related to the Monaco editor integration

Workaround

The build step has been temporarily removed from CI to allow development to continue. The application works correctly in development mode with reflex run.

Environment

  • Reflex Version: 0.8.6
  • Python Version: 3.11-3.13 (tested in CI)
  • Node.js Version: 20.18.2 (with warning about outdated version)
  • Build Tool: React Router + Rolldown/Vite

Related Files

  • Main application: agentic_connector_builder_webapp/agentic_connector_builder_webapp.py
  • CI workflow: .github/workflows/ci.yml
  • Build documentation: BUILD_ISSUE.md

Next Steps

  1. Investigate component import/export patterns
  2. Test with simplified component structure
  3. Check Reflex version compatibility and SSR requirements
  4. Consider disabling SSR if not required for the use case
  5. Re-enable build step in CI once resolved

Requested by: @aaronsteers during CI/CD setup Session: https://app.devin.ai/sessions/0937a847256e42f2ae060a86cd6b2d1c