fix spurious compilation errors by notifying language server of newly…

… created packs

extensions/ql-vscode/src/databases/local-databases/database-manager.ts

@@ -44,6 +44,7 @@ import { telemetryListener } from "../../common/vscode/telemetry";
 import type { LanguageContextStore } from "../../language-context-store";
 import type { DatabaseOrigin } from "./database-origin";
 import { ensureZippedSourceLocation } from "./database-contents";
+import type { LanguageClient } from "vscode-languageclient/node";
 
 /**
  * The name of the key in the workspaceState dictionary in which we
@@ -118,6 +119,7 @@ export class DatabaseManager extends DisposableObject {
     private readonly app: App,
     private readonly qs: QueryRunner,
     private readonly cli: CodeQLCliServer,
+    private readonly langClient: LanguageClient,
     private readonly languageContext: LanguageContextStore,
     public logger: Logger,
   ) {
@@ -407,6 +409,7 @@ export class DatabaseManager extends DisposableObject {
       const qlPackGenerator = new QlPackGenerator(
         databaseItem.language,
         this.cli,
+        this.langClient,
         qlpackStoragePath,
         qlpackStoragePath,
       );

extensions/ql-vscode/src/extension.ts

@@ -792,12 +792,16 @@ async function activateWithInstalledDistribution(
   const languageSelectionPanel = new LanguageSelectionPanel(languageContext);
   ctx.subscriptions.push(languageSelectionPanel);
 
+  void extLogger.log("Initializing CodeQL language server.");
+  const languageClient = createLanguageClient(qlConfigurationListener);
+
   void extLogger.log("Initializing database manager.");
   const dbm = new DatabaseManager(
     ctx,
     app,
     qs,
     cliServer,
+    languageClient,
     languageContext,
     extLogger,
   );
@@ -961,16 +965,14 @@ async function activateWithInstalledDistribution(
 
   ctx.subscriptions.push(tmpDirDisposal);
 
-  void extLogger.log("Initializing CodeQL language server.");
-  const languageClient = createLanguageClient(qlConfigurationListener);
-
   const localQueries = new LocalQueries(
     app,
     qs,
     qhm,
     dbm,
     databaseFetcher,
     cliServer,
+    languageClient,
     databaseUI,
     localQueryResultsView,
     queryStorageDir,

extensions/ql-vscode/src/local-queries/local-queries.ts

@@ -55,6 +55,7 @@ import { tryGetQueryLanguage } from "../common/query-language";
 import type { LanguageContextStore } from "../language-context-store";
 import type { ExtensionApp } from "../common/vscode/extension-app";
 import type { DatabaseFetcher } from "../databases/database-fetcher";
+import type { LanguageClient } from "vscode-languageclient/node";
 
 export enum QuickEvalType {
   None,
@@ -72,6 +73,7 @@ export class LocalQueries extends DisposableObject {
     private readonly databaseManager: DatabaseManager,
     private readonly databaseFetcher: DatabaseFetcher,
     private readonly cliServer: CodeQLCliServer,
+    private readonly langClient: LanguageClient,
     private readonly databaseUI: DatabaseUI,
     private readonly localQueryResultsView: ResultsView,
     private readonly queryStorageDir: string,
@@ -324,6 +326,7 @@ export class LocalQueries extends DisposableObject {
         const language = this.languageContextStore.selectedLanguage;
         const skeletonQueryWizard = new SkeletonQueryWizard(
           this.cliServer,
+          this.langClient,
           progress,
           this.app,
           this.databaseManager,

extensions/ql-vscode/src/local-queries/qlpack-generator.ts

@@ -6,6 +6,11 @@ import type { CodeQLCliServer } from "../codeql-cli/cli";
 import type { QueryLanguage } from "../common/query-language";
 import { getOnDiskWorkspaceFolders } from "../common/vscode/workspace-folders";
 import { basename } from "../common/path";
+import {
+  DidChangeWatchedFilesNotification,
+  FileChangeType,
+} from "vscode-languageclient";
+import type { LanguageClient } from "vscode-languageclient/node";
 
 export class QlPackGenerator {
   private qlpackName: string | undefined;
@@ -17,6 +22,7 @@ export class QlPackGenerator {
   constructor(
     private readonly queryLanguage: QueryLanguage,
     private readonly cliServer: CodeQLCliServer,
+    private readonly langClient: LanguageClient,
     private readonly storagePath: string,
     private readonly queryStoragePath: string,
     private readonly includeFolderNameInQlpackName: boolean = false,
@@ -114,5 +120,27 @@ select f, "Hello, world!"
 
   private async createCodeqlPackLockYaml() {
     await this.cliServer.packAdd(this.folderUri.fsPath, this.queryLanguage);
+    // when the language pack has not been available locally before, the
+    // packAdd command will download it. This will trigger a pack change that
+    // the language server needs to be notified of:
+    await this.notifyPackChanged(this.folderUri.fsPath, this.langClient);
+  }
+
+  private async notifyPackChanged(
+    packFileDir: string,
+    ideServer: LanguageClient,
+  ) {
+    const packFilePath = join(packFileDir, this.qlpackFileName);
+    await this.cliServer.logger.log(
+      `Notifying pack change for ${packFilePath}`,
+    );
+    await ideServer.sendNotification(DidChangeWatchedFilesNotification.type, {
+      changes: [
+        {
+          type: FileChangeType.Changed,
+          uri: Uri.file(packFilePath).toString(),
+        },
+      ],
+    });
   }
 }

extensions/ql-vscode/src/local-queries/skeleton-query-wizard.ts

@@ -34,6 +34,7 @@ import type { QueryTreeViewItem } from "../queries-panel/query-tree-view-item";
 import { containsPath, pathsEqual } from "../common/files";
 import { getQlPackFilePath } from "../common/ql";
 import { getQlPackLanguage } from "../common/qlpack-language";
+import type { LanguageClient } from "vscode-languageclient/node";
 
 type QueryLanguagesToDatabaseMap = Record<string, string>;
 
@@ -56,6 +57,7 @@ export class SkeletonQueryWizard {
 
   constructor(
     private readonly cliServer: CodeQLCliServer,
+    private readonly langClient: LanguageClient,
     private readonly progress: ProgressCallback,
     private readonly app: App,
     private readonly databaseManager: DatabaseManager,
@@ -443,6 +445,7 @@ export class SkeletonQueryWizard {
     return new QlPackGenerator(
       this.language,
       this.cliServer,
+      this.langClient,
       this.qlPackStoragePath,
       this.queryStoragePath,
       includeFolderNameInQlpackName,