CustomEvent is not a generic type

[Cherry]

In other implementations of CustomEvent, it's a generic type that supports passing a type for details property, like so:

interface SomeCustomEventData {
  foo: boolean;
  bar: string;
}

const customEvent = new CustomEvent<SomeCustomEventData>('something', {
  detail: {
    foo: false,
    bar: 'abc'
  }
});

customEvent.detail.bar // string type

Reference: https://tsplay.dev/wXgvVW

With workers-types, CustomEvent doesn't appear to support this, so detail is always any | undefined. Attempting to pass a type in just errors with Expected 0 type arguments, but got 1. ts(2558).