TypeScript use of global type inside namespace with same type

Question

I have a type named the same as a global type. Specifically, an Event.

I've put my Event inside a namespace, which makes referring to it outside the namespace easy, but inside the namespace I can't refer to the global (or standard) one.

namespace Dot {
    export class Event {
        // a thing happens between two parties; nothing to do with JS Event
    }
    function doStuff(e : Event) {
       // Event is presumed to be a Dot.Event instead of usual JS event
       // Unable to refer to global type?
    }
}
function doStuff2(e : Event) {
    // Use of regular Event type, cool
}
function doStuff3(e : Dot.Event) {
    // Use of Dot event type, cool
}

I suspect this is simply not possible, but can this be confirmed? Any workarounds besides renaming the Dot.Event type?

Cheers

Related: github.com/Microsoft/TypeScript/issues/983

xmojmr
– xmojmr

2017-10-04 10:23:16 +00:00
Commented Oct 4, 2017 at 10:23 — xmojmr
– xmojmr, Commented Oct 4, 2017 at 10:23

Fenton · Accepted Answer · 2017-10-04 07:39:20Z

4

You could create a type to represent the global Event type, and use it within the namespace:

type GlobalEvent = Event;

namespace Dot {
    export class Event {
        // a thing happens between two parties; nothing to do with JS Event
    }
    function doStuff(e : GlobalEvent) {
       // Event is presumed to be a Dot.Event instead of usual JS event
       // Unable to refer to global type?
    }
}
function doStuff2(e : Event) {
    // Use of regular Event type, cool
}
function doStuff3(e : Dot.Event) {
    // Use of Dot event type, cool
}

But my recommendation would be to call your specialisation something else, for example DotEvent.

answered Oct 4, 2017 at 7:39

Fenton

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1 Comment

Phi Over a year ago

That's what I was looking for. The majority of Dot's code uses DotEvent, it's just the event listeners inside Dot that need standard Event, so I'll be going with your GlobalEvent method. Cheers

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