TypeScript doesn't allow event : CustomEvent in addEventListener

I'm using Visual Studio Code - Insiders v 1.29.0-insider

In my TypeScript project, I'm trying to write the following code:

buttonEl.addEventListener( 'myCustomEvent', ( event : CustomEvent ) => {
  //do something
} );

The problem is that the CustomEvent type gives me the error shown below. If I replace CustomEvent with Event, then there is no error, but then I have difficulty getting event.detail out of the event listener.

"resource": "/c:/Users/me/Documents/app/file.ts",
"owner": "typescript",
"code": "2345",
"severity": 8,
"message": "Argument of type '(event: CustomEvent<any>) => void' is not assignable to parameter of type 'EventListenerOrEventListenerObject'.\n  Type '(event: CustomEvent<any>) => void' is not assignable to type 'EventListener'.\n    Types of parameters 'event' and 'evt' are incompatible.\n      Type 'Event' is not assignable to type 'CustomEvent<any>'.\n        Property 'detail' is missing in type 'Event'.",
"source": "ts",
"startLineNumber": 86,
"startColumn": 44,
"endLineNumber": 86,
"endColumn": 72

}