fix: respect the vitest.rootConfig if the workspace only has a single folder

Author: sheremet-va

src/api/pkg.ts

@@ -30,6 +30,9 @@ export interface VitestPackage {
 
 function resolveVitestConfig(showWarning: boolean, configOrWorkspaceFile: vscode.Uri): VitestPackage | null {
   const folder = vscode.workspace.getWorkspaceFolder(configOrWorkspaceFile)!
+  if (!folder)
+    throw new Error(`Workspace folder not found for ${configOrWorkspaceFile}. Does the file exist?`)
+
   const cwd = dirname(configOrWorkspaceFile.fsPath)
   const vitest = resolveVitestPackage(dirname(configOrWorkspaceFile.fsPath), folder)
 

src/config.ts

@@ -15,13 +15,10 @@ export function getConfigValue<T>(
 }
 
 export function getConfig(workspaceFolder?: WorkspaceFolder) {
-  let workspace: WorkspaceFolder | vscode.Uri | undefined
-  if (typeof workspaceFolder === 'string')
-    workspace = vscode.Uri.from({ scheme: 'file', path: workspaceFolder })
-  else
-    workspace = workspaceFolder
+  if (!workspaceFolder && vscode.workspace.workspaceFolders?.length === 1)
+    workspaceFolder = vscode.workspace.workspaceFolders[0]
 
-  const folderConfig = vscode.workspace.getConfiguration('vitest', workspace)
+  const folderConfig = vscode.workspace.getConfiguration('vitest', workspaceFolder)
   const rootConfig = vscode.workspace.getConfiguration('vitest')
 
   const get = <T>(key: string, defaultValue?: T) => getConfigValue<T>(