@atlaskit/editor-core/dist/esm/create-editor/ReactEditorView/getUAPrefix.js

A package contains Atlassian editor core functionality

import { getBrowserInfo } from '@atlaskit/editor-common/browser';
export function getUAPrefix() {
  var browser = getBrowserInfo();
  if (browser.chrome) {
    return 'ua-chrome';
  } else if (browser.ie) {
    return 'ua-ie';
  } else if (browser.gecko) {
    return 'ua-firefox';
  } else if (browser.safari) {
    return 'ua-safari';
  }
  return '';
}