AI & Machine Learning

MUI v4/v5 Style Conflicts in single-spa - A Complete Debug Record

Ali Nemati14 hours ago54 sec read4 views0 listens

This case study highlights a complex CSS conflict issue in a micro-frontends architecture using single-spa and MUI (Material-UI). Here's a summary of the key points:

Conflict Origin: The problem arises from two different versions of Material-UI (MUI) being used across multiple applications, with one version (v4) using JSS for CSS injection and another (v5) using Emotion.
CSS Class Overlap: Both MUI v4 and v5 use the same semantic class names like .MuiCircularProgress-root. However, their styling rules differ:
- MUI v5 with Emotion sets border-radius: 50% for circular indicators.
- MUI v4 with JSS sets border-radius: 0.
single-spa Behavior:
- single-spa manages JavaScript isolation but not CSS isolation, meaning all child applications share the same <head> in terms of style tags.
- When a route changes, single-spa mounts or unmounts child apps based on their activity functions.
CSS Injection Differences:
- JSS injects and removes styles dynamically as it mounts/unmounts.

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