msal-outlook-native-hack.js

const isOutlookNative = Office.context.mailbox && Office.context.mailbox.diagnostics.hostName === 'Outlook';

if (isOutlookNative) {
  msal.openPopup = () => {
    const dummy = {
      close() {
      },
      location: {
        assign(url) {
          Office.context.ui.displayDialogAsync(url, { width: 25 }, res => {
            dummy.close = res.value.close;
            res.value.addEventHandler(Office.EventType.DialogMessageReceived, ({ message }) =>
              dummy.location.href = dummy.location.hash = message
            );
          });
        }
      }
    };
    return dummy;
  };
  const { hash } = window.location;
  if (msal.isCallback(hash)) {
    Office.context.ui.messageParent(hash);
  }
}