feat(lsp): add type definition provider (#12789)

2 files changed, 16 insertions, 0 deletions

diff --git a/cli/tsc/99_main_compiler.js b/cli/tsc/99_main_compiler.js
index 1b3999bf9..d309956cb 100644
--- a/cli/tsc/99_main_compiler.js
+++ b/cli/tsc/99_main_compiler.js
@@ -810,6 +810,15 @@ delete Object.prototype.__proto__;
           ts.getSupportedCodeFixes(),
         );
       }
+      case "getTypeDefinition": {
+        return respond(
+          id,
+          languageService.getTypeDefinitionAtPosition(
+            request.specifier,
+            request.position,
+          ),
+        );
+      }
       case "prepareCallHierarchy": {
         return respond(
           id,
diff --git a/cli/tsc/compiler.d.ts b/cli/tsc/compiler.d.ts
index 8e6b6d417..d206c0b6b 100644
--- a/cli/tsc/compiler.d.ts
+++ b/cli/tsc/compiler.d.ts
@@ -66,6 +66,7 @@ declare global {
     | GetSignatureHelpItemsRequest
     | GetSmartSelectionRange
     | GetSupportedCodeFixes
+    | GetTypeDefinitionRequest
     | PrepareCallHierarchy
     | ProvideCallHierarchyIncomingCalls
     | ProvideCallHierarchyOutgoingCalls;
@@ -220,6 +221,12 @@ declare global {
     method: "getSupportedCodeFixes";
   }
 
+  interface GetTypeDefinitionRequest extends BaseLanguageServerRequest {
+    method: "getTypeDefinition";
+    specifier: string;
+    position: number;
+  }
+
   interface PrepareCallHierarchy extends BaseLanguageServerRequest {
     method: "prepareCallHierarchy";
     specifier: string;