export interface with a property decorator not working

TypeScript Version: 2.1.4

Code

Interface definition:

export interface Event { title: string };

Decorated property:

import { Event } from './event.ts';
import { Input } from '@angular/core';

export class SomeClass {
  @Input() event: Event;
}

Expected behavior:

In the generated code it should be able to find the event module.

Actual behavior:

It compiles and in the browser, the Input function is looking for a variable named Event which doesn't exist on the module.

The error is this:

Uncaught ReferenceError: event_1 is not defined

And the code generated looks like this:

    __decorate([
	    core_1.Input(),
	    __metadata("design:type", event_1.Event)
	]

Leaving out the type declaration for the decorated property or declare it as an any type works. Is there a better workaround than this? Perhaps declaring the type of that property in a declarations file?

edit: I found another workaround, I can declare an extra variable, export it from the event.ts and then import it and do a console.log (just to make sure it isn't compiled out). There's a bunch of logs in the console but it does load up.

[aluanhaddad]

It is not related to exporting an interface. It seems like it may be confusing your local Event interface with the dom Event for some reason. I am pretty condifdent this is the case because because if I change "lib": ["dom", es2017"] to "lib": ["es2017"], or if I rename the local Event interface to Thing, everything works as expected
Here is a minimal repro using 2.2.0-dev.20161224

interface Event { title: string; };

declare function decorated(target: {}, key: string): void;

export class SomeClass {
  @decorated event: Event;
}

This produces

__decorate([
    property,
    __metadata("design:type", Event)
], SomeClass.prototype, "event", void 0);

But this

interface Thing { title: string; };

declare function decorated(target: {}, key: string): void;

export class SomeClass {
  @decorated event: Event;
}

Correctly produces

__decorate([
  property,
  __metadata("design:type", Object)
], SomeClass.prototype, "event", void 0);

So I will use the workaround of renaming it from Event to something else.

Also I should have mentioned I'm targeting es5 and the libs I'm using are es2015 and dom.

[aluanhaddad]

I don't believe any of these changes should be necessary. I think this is a legitimate bug