Edit Theme JavaScript


We do not support code customizations. This guide offers a basic reference for developers. Always test code changes on a duplicated, unpublished version of your theme. For assistance, we recommend finding a professional developer through Shopify Experts ↗ or Task Husky ↗.

If you want to modify only a few components and retain code splitting, consider using Spark's standalone file for custom JavaScript events.

Spark includes a single, editable JavaScript file (assets/theme.js) for custom development that can be enabled in the snippets/theme-globals.liquid file.

Switching to the unminified theme.js disables code splitting, which bundles the theme JavaScript into multiple files used for lazy-loading and improved site performance. We do not recommend editing these files directly.

Switch to theme.js

The theme.js file, when enabled, lets you edit a single JavaScript file, instead of many files, and includes comments from our developers to help you along.


Open the theme-globals.liquid file in the Snippets folder.

  1. Find the useUnminThemeJS variable and set it to true


{% assign useUnminThemeJS = false %}


2. You can now begin editing the **`theme.js`** file in the **Assets** folder.

> We highly recommend backing up your theme and documenting any additions for troubleshooting and theme updates, which require manually transferring the code.

How's Spark working for you?

We built Spark with developers in mind. We're looking to create relationships with third-party developers using our themes and want to hear from you about what you're building. Please feel free to reach out with questions or introduce yourself by e-mailing us at developers@fluorescent.co

Related links

Custom JavaScript events Custom Liquid Custom CSS Custom fonts

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