isEdge

1/**
2 * Determines if the current browser is Microsoft Edge.
3 *
4 * @returns True if running in Edge, false otherwise.
5 */
6export function isEdge(): boolean {
7  if (typeof navigator === 'undefined') return false;
8  const ua = navigator.userAgent;
9  return /sEdg//.test(ua);
10}

1const originalNavigator = global.navigator;
2
3afterEach(() => {
4  global.navigator = originalNavigator;
5});
6
7test('returns true for Edge userAgent', () => {
8  // @ts-ignore
9  global.navigator = {
10    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 ' +
11      '(KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 Edg/91.0.864.59'
12  };
13  expect(isEdge()).toBe(true);
14});
15
16test('returns false for Chrome userAgent', () => {
17  // @ts-ignore
18  global.navigator = {
19    userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 ' +
20      '(KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'
21  };
22  expect(isEdge()).toBe(false);
23});
24
25test('returns false if navigator is undefined', () => {
26  // @ts-ignore
27  delete global.navigator;
28  expect(isEdge()).toBe(false);
29});