CommandManager API in JavaScript PDF Viewer API control

<div id="pdfViewer" style="height: 100%;width: 100%;"></div>

let viewer: PdfViewer = new PdfViewer();
viewer.commandManager = {
     keyboardCommand: [{
         name: 'customCopy',
         gesture: {
             pdfKeys: PdfKeys.G,
             modifierKeys: ModifierKeys.Shift | ModifierKeys.Alt
         }
      },
      {
         name: 'customPaste',
         gesture: {
             pdfKeys: PdfKeys.H,
             modifierKeys: ModifierKeys.Shift | ModifierKeys.Alt
         }
     }]
};
viewer.appendTo("#pdfViewer");