ReferenceError: Can't find variable: navigator

1 | require('webcrypto-shim');
2 | var b64u = require('b64u-lite/bundle/b64u-lite');
3 | var str2buf = require('str2buf');
4 | 
5 | var isEdge = navigator.userAgent.indexOf('Edge') > -1;
                 ^
ReferenceError: Can't find variable: navigator
      at /home/ubuntu/ewsaaa/node_modules/isomorphic-webcrypto/src/browser.js:5:13
      at bun:wrap:1:16354
      at /home/ubuntu/ewsaaa/node_modules/isomorphic-webcrypto/src/main.browser.js:1:25
      at bun:wrap:1:16354
      at /home/ubuntu/ewsaaa/node_modules/tonweb/src/utils/Utils.js:12:23
      at bun:wrap:1:16354
      at /home/ubuntu/ewsaaa/node_modules/tonweb/src/utils/index.js:19:12
      at bun:wrap:1:16354
      at /home/ubuntu/ewsaaa/node_modules/tonweb/src/index.js:1:22
      at bun:wrap:1:16354
      at /home/ubuntu/ewsaaa/ilv4.js:2:0