correct workspace path for mutiroot scenarios no-config debugging

Author: eleanorjboyd

src/extension/noConfigDebugInit.ts

@@ -37,15 +37,17 @@ export async function registerNoConfigDebug(
 
     // create a temp directory for the noConfigDebugAdapterEndpoints
     // file path format: extPath/.noConfigDebugAdapterEndpoints/endpoint-stableWorkspaceHash.txt
-    const workspaceUri = workspace.workspaceFolders?.[0]?.uri;
-    if (!workspaceUri) {
-        traceError('No workspace folder found');
-        return Promise.resolve(new Disposable(() => {}));
+    let workspaceFile = workspace.workspaceFile?.fsPath;
+    if (!workspaceFile) {
+        workspaceFile = workspace.workspaceFolders?.[0].uri.fsPath;
+    }
+    if (!workspaceFile) {
+        throw new Error('No workspace folder detected. Please open a workspace.');
     }
 
     // create a stable hash for the workspace folder, reduce terminal variable churn
     const hash = crypto.createHash('sha256');
-    hash.update(workspaceUri.toString());
+    hash.update(workspaceFile);
     const stableWorkspaceHash = hash.digest('hex').slice(0, 16);
 
     const tempDirPath = path.join(extPath, '.noConfigDebugAdapterEndpoints');