Cannot extend eventemitter3 class #7439

Thank you for this great project!

I've encountered a tsc compile failure while extending eventemitter3 class.

code:

import EventEmitter = require('eventemitter3');

export default class MyEmitter extends EventEmitter { }

tsc error message:

src/MyEmitter.ts(3,40): error TS4020: Extends clause of exported class 'MyEmitter' has or is using private name 'EventEmitter'.

This issue seems to be introduced with recent change (acf0d0f), because older version of definition file (e15d282) does not make that kind of failure.

Here is full version of issue reproducing code: pawsong/tsd-eventemitter3-issue

My current workaround is using old version (e15d282). Is this a bug or am I doing something wrong?