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UI Extensions

This repo contains the public definition of Shopify’s UI extension API. App developers can use these libraries for a strongly-typed, optimized development experience that lets them focus on integrating their app’s features deep into Shopify workflows. You can learn more about what is possible with UI extensions in Shopify’s developer documentation.

Note: UI extensions are a versioned API. This branch contains the APIs for the unstable API version. The following API versions are available as separate branches in this repo: 2023-04, 2023-07

Shopify provides different “variants” of UI extension APIs that are suitable for different developers:

What are “UI extensions”?

A UI extension is a JavaScript-based module that can hook in to client-side behaviors on any of Shopify’s first party UI surface areas. The most minimal definition of a UI extension has the following properties, which are configured in a shopify.extension.toml file in your project:

  • A name that is presented to merchants when interacting with the extension.
  • The target that the UI extension wishes to inject into. These are represented with string identifiers that describe the surface and responsibility of the extension. For example, purchase.checkout.cart-line-item.render-after target gives a UI Extension the ability to render UI after the each cart line in a checkout.
  • The JavaScript module in your local project that will be run to render UI.

The types in this package allow us to represent additional details about the targets developers can implement. Each target can have a custom set of APIs available to it, which includes:

  • What UI Components are available to be rendered, and what properties those UI components accept
  • What imperative APIs are provided by the host application, for reading and writing data relevant to the extension

UI extensions are built on an open source project called, remote-ui, which allows them to render native UI elements while being safely sandboxed. If you want to learn more, we’ve written a technical explanation of how extensions work under the hood.

Open Source Agenda is not affiliated with "Ui Extensions" Project. README Source: Shopify/ui-extensions
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