[ty] Added support for "go to references" in ty playground. (#19516)

This PR adds support for "go to references" in the ty playground.

<img width="393" height="168" alt="image"
src="https://github.com/user-attachments/assets/ce3ae1bf-c17c-4510-9f77-20b10f6170c4"
/>

---------

Co-authored-by: UnboundVariable <unbound@gmail.com>

crates/ty_wasm/src/lib.rs

@@ -16,7 +16,7 @@ use ruff_source_file::{LineIndex, OneIndexed, SourceLocation};
 use ruff_text_size::{Ranged, TextSize};
 use ty_ide::{
     MarkupKind, RangedValue, goto_declaration, goto_definition, goto_type_definition, hover,
-    inlay_hints,
+    inlay_hints, references,
 };
 use ty_ide::{NavigationTargets, signature_help};
 use ty_project::metadata::options::Options;
@@ -327,6 +327,29 @@ impl Workspace {
         ))
     }
 
+    #[wasm_bindgen(js_name = "gotoReferences")]
+    pub fn goto_references(
+        &self,
+        file_id: &FileHandle,
+        position: Position,
+    ) -> Result<Vec<LocationLink>, Error> {
+        let source = source_text(&self.db, file_id.file);
+        let index = line_index(&self.db, file_id.file);
+
+        let offset = position.to_text_size(&source, &index, self.position_encoding)?;
+
+        let Some(targets) = references(&self.db, file_id.file, offset, true) else {
+            return Ok(Vec::new());
+        };
+
+        Ok(targets
+            .into_iter()
+            .flat_map(|target| {
+                map_targets_to_links(&self.db, target, &source, &index, self.position_encoding)
+            })
+            .collect())
+    }
+
     #[wasm_bindgen]
     pub fn hover(&self, file_id: &FileHandle, position: Position) -> Result<Option<Hover>, Error> {
         let source = source_text(&self.db, file_id.file);

playground/ty/src/Editor/Editor.tsx

@@ -148,6 +148,7 @@ class PlaygroundServer
     languages.TypeDefinitionProvider,
     languages.DeclarationProvider,
     languages.DefinitionProvider,
+    languages.ReferenceProvider,
     editor.ICodeEditorOpener,
     languages.HoverProvider,
     languages.InlayHintsProvider,
@@ -160,6 +161,7 @@ class PlaygroundServer
   private typeDefinitionProviderDisposable: IDisposable;
   private declarationProviderDisposable: IDisposable;
   private definitionProviderDisposable: IDisposable;
+  private referenceProviderDisposable: IDisposable;
   private editorOpenerDisposable: IDisposable;
   private hoverDisposable: IDisposable;
   private inlayHintsDisposable: IDisposable;
@@ -179,6 +181,8 @@ class PlaygroundServer
       monaco.languages.registerDeclarationProvider("python", this);
     this.definitionProviderDisposable =
       monaco.languages.registerDefinitionProvider("python", this);
+    this.referenceProviderDisposable =
+      monaco.languages.registerReferenceProvider("python", this);
     this.hoverDisposable = monaco.languages.registerHoverProvider(
       "python",
       this,
@@ -582,6 +586,35 @@ class PlaygroundServer
     return mapNavigationTargets(links);
   }
 
+  provideReferences(
+    model: editor.ITextModel,
+    position: Position,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    context: languages.ReferenceContext,
+    // eslint-disable-next-line @typescript-eslint/no-unused-vars
+    _: CancellationToken,
+  ): languages.ProviderResult<languages.Location[]> {
+    const workspace = this.props.workspace;
+
+    const selectedFile = this.props.files.selected;
+    if (selectedFile == null) {
+      return;
+    }
+
+    const selectedHandle = this.props.files.handles[selectedFile];
+
+    if (selectedHandle == null) {
+      return;
+    }
+
+    const links = workspace.gotoReferences(
+      selectedHandle,
+      new TyPosition(position.lineNumber, position.column),
+    );
+
+    return mapNavigationTargets(links);
+  }
+
   openCodeEditor(
     source: editor.ICodeEditor,
     resource: Uri,
@@ -667,6 +700,7 @@ class PlaygroundServer
     this.typeDefinitionProviderDisposable.dispose();
     this.declarationProviderDisposable.dispose();
     this.definitionProviderDisposable.dispose();
+    this.referenceProviderDisposable.dispose();
     this.inlayHintsDisposable.dispose();
     this.formatDisposable.dispose();
     this.rangeSemanticTokensDisposable.dispose();