perf: delay diagnostics to give priority to other client requests (#345)

Author: tomv564

src/typescript-service.ts

@@ -1267,6 +1267,7 @@ export class TypeScriptService {
 		// Ensure files needed for most operations are fetched
 		await this.projectManager.ensureReferencedFiles(uri).toPromise();
 		this.projectManager.didOpen(uri, params.textDocument.text);
+		await new Promise(resolve => setTimeout(resolve, 200));
 		this._publishDiagnostics(uri);
 	}
 
@@ -1288,6 +1289,7 @@ export class TypeScriptService {
 			return;
 		}
 		this.projectManager.didChange(uri, text);
+		await new Promise(resolve => setTimeout(resolve, 200));
 		this._publishDiagnostics(uri);
 	}