TypeError: Cannot use 'in' operator to search for 'withCredentials' in undefined

[rahulkelaskar]

The library doesn't pass through Jest unit test. On debug it is observed that
NativeEventSource is undefined. Since the Jest runs on terminal NativeEventSource is undefined.
var R = NativeEventSource if (XMLHttpRequest != undefined && (NativeEventSource == undefined || !("withCredentials" in NativeEventSource.prototype))) {

I've tried multiple ways, but couldn't find any solution.

I'm currently using
angular: 12.2.0
"jest": "^27.0.3",
"jest-junit": "^11.1.0",
"jest-preset-angular": "9.0.0",
"jest-zone-patch": "~0.0.10",

[Yaffle]

NativeEventSource is not undefined so, otherwise the "in" is not executed because of the short-circuit evaluation and "NativeEventSource == undefined" check.
perhaps, you have NativeEventSource.prototype == undefined, which is weird. could you just do something to set it to non-undefined value? (or just do globalThis.EventSource = undefined)