fix: restore declarative map extension build

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: janechu

packages/fast-element/src/declarative/attribute-map.ts

@@ -1,8 +1,8 @@
 import { AttributeDefinition } from "../components/attributes.js";
 import {
     type FASTElementDefinition,
+    type FASTElementExtension,
     trackLateAttributeDefinition,
-    FASTElementExtension,
 } from "../components/fast-definitions.js";
 import { Observable } from "../observation/observable.js";
 import { setDefinitionElementOptions } from "./definition-options.js";

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.attributemap.md

@@ -1,46 +1,38 @@
 ---
 id: "fast-element.attributemap"
-title: "AttributeMap class"
+title: "attributeMap() function"
 layout: 3x-api
 eleventyNavigation:
   key: "declarative.jsapi3xfast-element.attributemap"
   parent: "@microsoft/fast-element/declarative.js3x"
-  title: "AttributeMap class"
+  title: "attributeMap() function"
 navigationOptions:
   activeKey: "declarative.jsapi3xfast-element.attributemap"
 ---
 <!-- Do not edit this file. It is automatically generated by API Documenter. -->
 
-[@microsoft/fast-element/declarative.js](../fast-element/index.html) &gt; [AttributeMap](../fast-element.attributemap/index.html)
+[@microsoft/fast-element/declarative.js](../fast-element/index.html) &gt; [attributeMap](../fast-element.attributemap/index.html)
 
-## AttributeMap class
+## attributeMap() function
 
-AttributeMap provides functionality for detecting simple (leaf) properties in a generated JSON schema and defining them as  properties on a class prototype.
-
-A property is a candidate for  when its schema entry has no nested `properties`<!-- -->, no `type`<!-- -->, and no `anyOf` — i.e. it is a plain binding like {<!-- -->{<!-- -->foo<!-- -->}<!-- -->} or id="<!-- -->{<!-- -->{<!-- -->foo-bar<!-- -->}<!-- -->}<!-- -->".
-
-When `attribute-name-strategy` is `"camelCase"` (the default), the binding key is treated as a camelCase property name and the HTML attribute name is derived by converting it to kebab-case (e.g. property `fooBar` → attribute `foo-bar`<!-- -->). This matches the build-time `attribute-name-strategy` option in `@microsoft/fast-build`<!-- -->.
-
-When `attribute-name-strategy` is `"none"`<!-- -->, the binding key is used as both the attribute name and property name — no normalization is applied.
-
-Properties already decorated with `@attr` or `@observable` on the class are left untouched.
+Creates a FAST element extension that enables declarative attribute mapping for the resolved definition. When called without arguments, uses the default attribute-mapping behavior.
 
 **Signature:**
 
 ```typescript
-export declare class AttributeMap 
+export declare function attributeMap(option?: AttributeMapConfig): FASTElementExtension;
 ```
 
-## Constructors
+## Parameters
 
 <table><thead><tr><th>
 
-Constructor
+Parameter
 
 
 </th><th>
 
-Modifiers
+Type
 
 
 </th><th>
@@ -51,48 +43,22 @@ Description
 </th></tr></thead>
 <tbody><tr><td>
 
-[(constructor)(classPrototype, schema, definition, config)](../fast-element.attributemap._constructor_/)
+option
 
 
 </td><td>
 
+[AttributeMapConfig](../fast-element.attributemapconfig/)
+
 
 </td><td>
 
-Constructs a new instance of the `AttributeMap` class
+_(Optional)_
 
 
 </td></tr>
 </tbody></table>
 
-## Methods
-
-<table><thead><tr><th>
-
-Method
+**Returns:**
 
-
-</th><th>
-
-Modifiers
-
-
-</th><th>
-
-Description
-
-
-</th></tr></thead>
-<tbody><tr><td>
-
-[defineProperties()](../fast-element.attributemap.defineproperties/)
-
-
-</td><td>
-
-
-</td><td>
-
-
-</td></tr>
-</tbody></table>
+[FASTElementExtension](../fast-element.fastelementextension/)

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.elementoptions.attributemap.md

@@ -19,4 +19,4 @@ navigationOptions:
 
 ```typescript
 attributeMap?: AttributeMapConfig;
-```
+```

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.elementoptions.observermap.md

@@ -19,4 +19,4 @@ navigationOptions:
 
 ```typescript
 observerMap?: ObserverMapConfig;
-```
+```

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.fastelementextension.md

@@ -0,0 +1,24 @@
+---
+id: "fast-element.fastelementextension"
+title: "FASTElementExtension type"
+layout: 3x-api
+eleventyNavigation:
+  key: "declarative.jsapi3xfast-element.fastelementextension"
+  parent: "@microsoft/fast-element/declarative.js3x"
+  title: "FASTElementExtension type"
+navigationOptions:
+  activeKey: "declarative.jsapi3xfast-element.fastelementextension"
+---
+<!-- Do not edit this file. It is automatically generated by API Documenter. -->
+
+[@microsoft/fast-element/declarative.js](../fast-element/index.html) &gt; [FASTElementExtension](../fast-element.fastelementextension/index.html)
+
+## FASTElementExtension type
+
+A callback that receives a FASTElementDefinition during element registration. Extensions are invoked before the element is registered with the platform, allowing plugins to inspect or act on the resolved definition.
+
+**Signature:**
+
+```typescript
+export type FASTElementExtension = (definition: FASTElementDefinition) => void;
+```

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.md

@@ -95,6 +95,43 @@ This class is intentionally stateless across invocations — all mutable parsing
 The parsing pipeline is fully synchronous — no promises are allocated during template resolution.
 
 
+</td></tr>
+</tbody></table>
+
+## Functions
+
+<table><thead><tr><th>
+
+Function
+
+
+</th><th>
+
+Description
+
+
+</th></tr></thead>
+<tbody><tr><td>
+
+[attributeMap(option)](../fast-element.attributemap/)
+
+
+</td><td>
+
+Creates a FAST element extension that enables declarative attribute mapping for the resolved definition. When called without arguments, uses the default attribute-mapping behavior.
+
+
+</td></tr>
+<tr><td>
+
+[observerMap(option)](../fast-element.observermap/)
+
+
+</td><td>
+
+Creates a FAST element extension that enables declarative observer mapping for the resolved definition. When called without arguments, observes every discovered root property.
+
+
 </td></tr>
 </tbody></table>
 
@@ -250,6 +287,17 @@ Description
 </td><td>
 
 
+</td></tr>
+<tr><td>
+
+[FASTElementExtension](../fast-element.fastelementextension/)
+
+
+</td><td>
+
+A callback that receives a FASTElementDefinition during element registration. Extensions are invoked before the element is registered with the platform, allowing plugins to inspect or act on the resolved definition.
+
+
 </td></tr>
 <tr><td>
 

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.observermap.md

@@ -1,38 +1,38 @@
 ---
 id: "fast-element.observermap"
-title: "ObserverMap class"
+title: "observerMap() function"
 layout: 3x-api
 eleventyNavigation:
   key: "declarative.jsapi3xfast-element.observermap"
   parent: "@microsoft/fast-element/declarative.js3x"
-  title: "ObserverMap class"
+  title: "observerMap() function"
 navigationOptions:
   activeKey: "declarative.jsapi3xfast-element.observermap"
 ---
 <!-- Do not edit this file. It is automatically generated by API Documenter. -->
 
-[@microsoft/fast-element/declarative.js](../fast-element/index.html) &gt; [ObserverMap](../fast-element.observermap/index.html)
+[@microsoft/fast-element/declarative.js](../fast-element/index.html) &gt; [observerMap](../fast-element.observermap/index.html)
 
-## ObserverMap class
+## observerMap() function
 
-ObserverMap provides functionality for caching binding paths, extracting root properties, and defining observable properties on class prototypes
+Creates a FAST element extension that enables declarative observer mapping for the resolved definition. When called without arguments, observes every discovered root property.
 
 **Signature:**
 
 ```typescript
-export declare class ObserverMap 
+export declare function observerMap(option?: ObserverMapConfig): FASTElementExtension;
 ```
 
-## Constructors
+## Parameters
 
 <table><thead><tr><th>
 
-Constructor
+Parameter
 
 
 </th><th>
 
-Modifiers
+Type
 
 
 </th><th>
@@ -43,48 +43,22 @@ Description
 </th></tr></thead>
 <tbody><tr><td>
 
-[(constructor)(classPrototype, schema, config)](../fast-element.observermap._constructor_/)
+option
 
 
 </td><td>
 
+[ObserverMapConfig](../fast-element.observermapconfig/)
+
 
 </td><td>
 
-Constructs a new instance of the `ObserverMap` class
+_(Optional)_
 
 
 </td></tr>
 </tbody></table>
 
-## Methods
-
-<table><thead><tr><th>
-
-Method
-
-
-</th><th>
-
-Modifiers
-
-
-</th><th>
-
-Description
-
+**Returns:**
 
-</th></tr></thead>
-<tbody><tr><td>
-
-[defineProperties()](../fast-element.observermap.defineproperties/)
-
-
-</td><td>
-
-
-</td><td>
-
-
-</td></tr>
-</tbody></table>
+[FASTElementExtension](../fast-element.fastelementextension/)

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.observermapconfig.properties.md

@@ -23,4 +23,4 @@ Per-root-property observation control. Keys are root property names discovered i
 properties?: {
         [rootProperty: string]: ObserverMapPathEntry;
     };
-```
+```

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.templateelement.elementoptions.md

@@ -15,7 +15,7 @@ navigationOptions:
 
 ## TemplateElement.elementOptions property
 
-A dictionary of custom element options
+A dictionary of fallback custom element options
 
 **Signature:**
 

sites/website/src/docs/3.x/api/fast-element/declarative/fast-element.templateelement.md

@@ -100,7 +100,7 @@ Description
 
 </td><td>
 
-A dictionary of custom element options
+A dictionary of fallback custom element options
 
 
 </td></tr>
@@ -183,7 +183,7 @@ Configure lifecycle callbacks for hydration events.
 
 </td><td>
 
-Set options for custom elements.
+Set fallback options for custom elements.
 
 
 </td></tr>