fix when no one document opened

Author: daimor

src/extension.ts

@@ -287,6 +287,13 @@ export async function activate(context: vscode.ExtensionContext): Promise<void>
     diagnosticProvider.updateDiagnostics(vscode.window.activeTextEditor.document);
   }
 
+  const proposed = packageJson.enableProposedApi
+    ? [
+        vscode.workspace.registerFileSearchProvider(FILESYSTEM_SCHEMA, new FileSearchProvider()),
+        vscode.workspace.registerTextSearchProvider(FILESYSTEM_SCHEMA, new TextSearchProvider()),
+      ]
+    : [];
+
   context.subscriptions.push(
     reporter,
     workspace.onDidChangeTextDocument(event => {
@@ -457,8 +464,7 @@ export async function activate(context: vscode.ExtensionContext): Promise<void>
     ),
 
     /* from proposed api */
-    vscode.workspace.registerFileSearchProvider(FILESYSTEM_SCHEMA, new FileSearchProvider()),
-    vscode.workspace.registerTextSearchProvider(FILESYSTEM_SCHEMA, new TextSearchProvider())
+    ...proposed
   );
   reporter.sendTelemetryEvent("extensionActivated");
 }

src/utils/index.ts

@@ -22,7 +22,14 @@ export interface CurrentFile {
 }
 
 export function currentFile(document?: vscode.TextDocument): CurrentFile {
-  document = document || (vscode.window.activeTextEditor.document ? vscode.window.activeTextEditor.document : null);
+  document =
+    document ||
+    (vscode.window.activeTextEditor && vscode.window.activeTextEditor.document
+      ? vscode.window.activeTextEditor.document
+      : null);
+  if (!document) {
+    return null;
+  }
   if (
     !schemas.includes(document.uri.scheme) &&
     (!document || !document.fileName || !document.languageId || !document.languageId.startsWith("objectscript"))