fix(daemon): clear diagnostics and reload TypeScript projects on watcher events

Evicting the entire entry on derived watcher events was overly aggressive.
Instead, clear cached diagnostics and send a reloadProjects command to the
TypeScript language server so it picks up workspace changes without losing
state.

src/daemon.ts

@@ -191,11 +191,15 @@ function forwardEvents(entry: ClientEntry, events: FileEvent[]): void {
     if (process.env.LSP_DEBUG) {
       log(`watcher fire`, entry.server.id, JSON.stringify(events));
     }
+    for (const uri of entry.opened.keys()) entry.client.clearDiagnostics(uri);
     entry.client.sendNotification("workspace/didChangeWatchedFiles", {
       changes: events,
     });
-    if (entry.usesDerivedWatchers) {
-      evict(entry, "derived watcher event");
+    if (entry.usesDerivedWatchers && entry.server.id === "typescript-language-server") {
+      void entry.client.sendRequest("workspace/executeCommand", {
+        command: "typescript.tsserverRequest",
+        arguments: ["reloadProjects"],
+      }).catch((err) => log("typescript reloadProjects failed", (err as Error).message));
     }
   } catch (err) {
     log(`watcher send failed`, entry.server.id, (err as Error).message);