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Warn when multiple instances of Emotion are used

See original GitHub issue

The problem

When multiple instances of Emotion are used (specifically, @emotion/core), theming and other parts of the library stop behaving correctly.

Proposed solution

Following the React way to solve this problem, we should put a check in Emotion to warn the user if multiple versions are being used together.

Alternative solutions

Alternatively we could store the whole Emotion context into a global variable and use it instead of defining a new one for each instance, but I’m not sure about possible downsides of this approach.

Additional context

For reference, here’s the React PR where the check was first introduced: https://github.com/facebook/react/pull/3579

Issue Analytics

State:
Created 4 years ago
Reactions:1
Comments:9 (6 by maintainers)

Top GitHub Comments

1reaction

Andaristcommented, Jan 5, 2020

This got merged into v11 branch.

1reaction

FezVrastacommented, Sep 30, 2019

In any case, this issue aims to provide a way to easily debug the issue, not to provide a solution to the multiple theme contexts. I’m saying this just in case you guys find an issue for this specific problem and may decide this issue can be closed.

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