fix(lsp): restart TS language service when caching dependencies (#14979)

cli/lsp/language_server.rs

@@ -2814,9 +2814,16 @@ impl Inner {
       self.client.show_message(MessageType::WARNING, err).await;
     }
 
-    // now that we have dependencies loaded, we need to re-analyze them and
-    // invalidate some diagnostics
-    self.diagnostics_server.invalidate(&[referrer]);
+    // Now that we have dependencies loaded, we need to re-analyze all the files.
+    // For that we're invalidating all the existing diagnostics and restarting
+    // the language server for TypeScript (as it might hold to some stale
+    // documents).
+    self.diagnostics_server.invalidate_all();
+    let _: bool = self
+      .ts_server
+      .request(self.snapshot(), tsc::RequestMethod::Restart)
+      .await
+      .unwrap();
     self.send_diagnostics_update();
     self.send_testing_update();
 

cli/lsp/tsc.rs

@@ -2871,6 +2871,9 @@ pub enum RequestMethod {
   ProvideCallHierarchyIncomingCalls((ModuleSpecifier, u32)),
   /// Resolve outgoing call hierarchy items for a specific position.
   ProvideCallHierarchyOutgoingCalls((ModuleSpecifier, u32)),
+
+  // Special request, used only internally by the LSP
+  Restart,
 }
 
 impl RequestMethod {
@@ -3084,6 +3087,10 @@ impl RequestMethod {
           "position": position
         })
       }
+      RequestMethod::Restart => json!({
+        "id": id,
+        "method": "restart",
+      }),
     }
   }
 }

cli/tsc/99_main_compiler.js

@@ -589,11 +589,16 @@ delete Object.prototype.__proto__;
    */
   function serverRequest({ id, ...request }) {
     debug(`serverRequest()`, { id, ...request });
+
     // reset all memoized source files names
     scriptFileNamesCache = undefined;
     // evict all memoized source file versions
     scriptVersionCache.clear();
     switch (request.method) {
+      case "restart": {
+        serverRestart();
+        return respond(id, true);
+      }
       case "configure": {
         const { options, errors } = ts
           .convertCompilerOptionsFromJson(request.compilerOptions, "");
@@ -918,6 +923,11 @@ delete Object.prototype.__proto__;
     debug("serverInit()");
   }
 
+  function serverRestart() {
+    languageService = ts.createLanguageService(host);
+    debug("serverRestart()");
+  }
+
   let hasStarted = false;
 
   /** Startup the runtime environment, setting various flags.

cli/tsc/compiler.d.ts

@@ -251,4 +251,8 @@ declare global {
     specifier: string;
     position: number;
   }
+
+  interface Restart {
+    method: "restart";
+  }
 }