Add assets config key support for UI extension points

[JoshuaWhite1]

Part of https://github.com/shop/issues-admin-extensibility/issues/2439

WHY are these changes introduced?

Adds support for an assets field on UI extension points, allowing extension point configurations to declare associated assets.

WHAT is this pull request doing?

• Adds an optional assets field to NewExtensionPointSchema in the extension schemas
• Passes the assets property through when transforming extension point targeting configurations in UIExtensionSchema
• Registers extension_points[].assets as a configKey in the UI extension specification so it is properly grouped and tracked per extension point target
• Updates DevNewExtensionPointSchema to omit assets from the base type and redefine it as a map of named Asset objects (with lastUpdated), preserving the existing dev payload structure while accommodating the new schema field

How to test your changes?

1. Create a UI extension with extension points that include an assets field in the configuration
2. Run shopify app dev and verify the extension point payload includes the assets field correctly
3. Verify that the dev server payload maps assets to the expected { [name: string]: Asset } structure

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

[JoshuaWhite1]

• address png encoding bug, path changes #7378
• Add assets config key support for UI extension points #7363 👈 (View in Graphite)
• support bundle folder in the bundle ui step config #7340
• main

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[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds support for an assets field on UI extension point configurations so that assets can be declared per extension point target and carried through schema transforms and config key tracking.

Changes:

• Adds assets to the base NewExtensionPointSchema Zod schema.
• Passes assets through when building extension_points in UIExtensionSchema.
• Registers extension_points[].assets as a configKey and adjusts dev payload typing to keep the existing {[name]: Asset} structure.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/app/src/cli/services/dev/extension/payload/models.ts	Updates dev extension point typing to omit base assets and redefine it as a named-asset map.
packages/app/src/cli/models/extensions/specifications/ui_extension.ts	Threads assets through extension point targeting transform and registers it as a tracked config key.
packages/app/src/cli/models/extensions/schemas.ts	Introduces assets on NewExtensionPointSchema.

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[vividviolet]

Tophat'd together with @JoshuaWhite1 - working great with upcoming Core changes.

I also tested that we get a proper error when trying to set assets on a block ui extension (not supported)

[vividviolet]

Look how easy it was to set this up for ui-extension. Good job @alfonso-noriega @isaacroldan!