React context works in export but not on preview

[maxaggedon]

Describe the bug
Consuming a react context with useContext(ThemeContext) yields an error :

TypeError: Cannot read properties of null (reading 'useContext')

To Reproduce
Steps to reproduce the behavior:

1. Create a context file
2. Use the Provider in your layout
3. Try to access value in your template
4. See error when using yarn preview

Expected behavior
Same rendering as in exported templates

Desktop (please complete the following information):

• OS: macOS
• Browser: Chrome
• Version: 1.0.1

[mnikolaus]

Check these conversations
#276
#426