TypeScript errors with children prop in @shopify/ui-extensions 2025.10.0-rc.43 - Polaris Web Components breaking change

Polaris
1

After updating from @shopify/ui-extensions@2025.10.0-rc.41 to @shopify/ui-extensions@2025.10.0-rc.43, TypeScript compilation fails with errors related to the children prop not being recognized on Polaris Web Components.

Error Details

The following TypeScript errors occur across all UI extension components:


Type '{ children: Element[]; }' is not assignable to type 'StackJSXProps & PreactBaseElementProps<Stack>'.

Property 'children' does not exist on type 'StackJSXProps & PreactBaseElementProps<Stack>'.

Type '{ children: string; }' has no properties in common with type 'ParagraphJSXProps & PreactBaseElementProps<Paragraph>'.

Type '{ children: Element; }' is not assignable to type 'BoxJSXProps & PreactBaseElementProps<Box>'.

Property 'children' does not exist on type 'BoxJSXProps & PreactBaseElementProps<Box>'.

Type '{ children: string; }' has no properties in common with type 'TableHeaderJSXProps & PreactBaseElementProps<TableHeader>'.

Type '{ children: number; type: "strong"; }' is not assignable to type 'TextJSXProps & PreactBaseElementProps<Text>'.

Property 'children' does not exist on type 'TextJSXProps & PreactBaseElementProps<Text>'.

Affected Components

  • s-stack

  • s-paragraph

  • s-box

  • s-text

  • s-table-header

  • s-link

  • s-button

  • s-select

  • s-option

  • s-grid

  • s-grid-item

  • s-heading

  • s-table

Environment

  • @shopify/ui-extensions: 2025.10.0-rc.43

  • preact: ^10.11.x

  • TypeScript: ^5.9.2

  • Node.js: >=22.16.0

  • npm: >=10.9.0

Expected Behavior

Components should accept children prop as they did in 2025.10.0-rc.41.

Actual Behavior

TypeScript compilation fails with children prop not being recognized on Polaris Web Components.

Workaround

Reverting to @shopify/ui-extensions@2025.10.0-rc.41 resolves the TypeScript errors.

Additional Context

This appears to be a breaking change introduced in the RC.43 patch that affects how Polaris Web Components handle the children prop. The issue affects all UI extensions using the RC version and prevents TypeScript compilation from succeeding.

Steps to Reproduce

  1. Install @shopify/ui-extensions@2025.10.0-rc.43

  2. Use any Polaris Web Component with children content

  3. Run TypeScript compilation

  4. Observe TypeScript errors related to children prop

2

Hi @blanklob

We shipped an update for this - can you upgrade to the latest version, test again and let us know if you’re still seeing this?

3

Yes I am still seeing this on the latest version:

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