tree: Expose the view schema on TreeView (#22547)

## Description

This PR exposes the view schema as a property on TreeView.

.changeset/dark-circles-whine.md

@@ -0,0 +1,12 @@
+---
+"@fluidframework/tree": minor
+---
+---
+section: tree
+---
+
+Exposes the view schema from the TreeView interface.
+
+Users of TreeView can now access the type-safe view schema directly on the view object via `TreeView.schema`.
+This allows users to avoid passing the schema around in addition to the view in scenarios where both are needed.
+It also avoids scenarios in which code wants to accept both a view and its schema and thus must constrain both to be of the same schema type.

packages/dds/tree/api-report/tree.alpha.api.md

@@ -595,6 +595,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/dds/tree/api-report/tree.beta.api.md

@@ -527,6 +527,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/dds/tree/api-report/tree.legacy.alpha.api.md

@@ -515,6 +515,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/dds/tree/api-report/tree.legacy.public.api.md

@@ -512,6 +512,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/dds/tree/api-report/tree.public.api.md

@@ -512,6 +512,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/dds/tree/src/shared-tree/schematizingTreeView.ts

@@ -123,6 +123,10 @@ export class SchematizingSimpleTreeView<in out TRootSchema extends ImplicitField
 		);
 	}
 
+	public get schema(): TRootSchema {
+		return this.config.schema;
+	}
+
 	public initialize(content: InsertableTreeFieldFromImplicitField<TRootSchema>): void {
 		this.ensureUndisposed();
 

packages/dds/tree/src/simple-tree/api/tree.ts

@@ -411,6 +411,11 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
 	 * Events for the tree.
 	 */
 	readonly events: Listenable<TreeViewEvents>;
+
+	/**
+	 * The view schema used by this TreeView.
+	 */
+	readonly schema: TSchema;
 }
 
 /**

packages/framework/fluid-framework/api-report/fluid-framework.alpha.api.md

@@ -967,6 +967,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/framework/fluid-framework/api-report/fluid-framework.beta.api.md

@@ -899,6 +899,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/framework/fluid-framework/api-report/fluid-framework.legacy.alpha.api.md

@@ -1281,6 +1281,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/framework/fluid-framework/api-report/fluid-framework.legacy.public.api.md

@@ -924,6 +924,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }
 

packages/framework/fluid-framework/api-report/fluid-framework.public.api.md

@@ -884,6 +884,7 @@ export interface TreeView<TSchema extends ImplicitFieldSchema> extends IDisposab
     initialize(content: InsertableTreeFieldFromImplicitField<TSchema>): void;
     get root(): TreeFieldFromImplicitField<TSchema>;
     set root(newRoot: InsertableTreeFieldFromImplicitField<TSchema>);
+    readonly schema: TSchema;
     upgradeSchema(): void;
 }