fixing TypeScript error (before and after)

ext.ts

// Before fixing TypeScript errors

public static registerCommand(context: vscode.ExtensionContext): vscode.Disposable {
  const commands = vscode.commands.registerCommand(this.viewType, async () => {

    // file chooser
    let uri: vscode.Uri | undefined = await vscode.window.showOpenDialog()

    this.createOrShow(uri[0]);

  });
  return commands;
}

// Fixed TypeScript error

public static registerCommand(context: vscode.ExtensionContext): vscode.Disposable {
  const commands = vscode.commands.registerCommand(this.viewType, async () => {

    // file chooser
    let uri: vscode.Uri[] | undefined = await vscode.window.showOpenDialog()

    if (uri) this.createOrShow(uri[0]);

  });
  return commands;
}