AUR0172

Error Message

AUR0172: Expression error: invalid tagged template on optional chain in "{{expression}}"

Description

This error occurs when a tagged template literal is used on an optional chain, which is not supported by Aurelia’s expression parser.

Example Trigger

<!-- ❌ Tagged template on optional chain -->
<div textcontent.bind="tag?.fn`x`"></div>

Solution

• Avoid tagged templates in binding expressions. Move the logic into view-model code.