=== tests/cases/compiler/objectIndexer.ts ===
export interface Callback {
>Callback : Callback

    (value: any): void;
>value : any
}

interface IMap {
>IMap : IMap

    [s: string]: Callback;
>s : string
>Callback : Callback
}

class Emitter {
>Emitter : Emitter

    private listeners: IMap;
>listeners : IMap
>IMap : IMap

    constructor () {
        this.listeners = {};
>this.listeners = {} : { [x: string]: undefined; }
>this.listeners : IMap
>this : Emitter
>listeners : IMap
>{} : { [x: string]: undefined; }
    }
}