Developer changelog
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Redesign of Shopify theme editor built in React
Themes
Effective September 22, 2020
The theme editor has been rebuilt in React and includes an updated mobile theme editing experience and many UI enhancements. The rebuild also decreases load times for large themes, making it easier and faster for merchants to set up and customize their online store, while also laying a new foundation for future improvements to the theme editing experience.
Update 9/25/2020: If you provide an app that detects usage in the Theme Editor, then please ensure that you’re using the official JavaScript API, Shopify.designMode, to detect the Theme Editor. Other implementations involving detection of the URL could cause broken experiences for merchants. For more information please review the community forum or the partner discussion area.
To learn more about the new theme editor, please visit the Shopify Help Center.