tests/cases/compiler/indexer2.ts(6,25): error TS2352: Neither type '{ [x: number]: undefined; }' nor type 'IDirectChildrenMap' is assignable to the other.
  Types of property 'hasOwnProperty' are incompatible.
    Type '(v: string) => boolean' is not assignable to type '(objectId: number) => boolean'.
      Types of parameters 'v' and 'objectId' are incompatible.
        Type 'string' is not assignable to type 'number'.


==== tests/cases/compiler/indexer2.ts (1 errors) ====
    interface IHeapObjectProperty {}
    interface IDirectChildrenMap { 
            hasOwnProperty(objectId: number) : boolean; 
            [objectId: number] : IHeapObjectProperty[]; 
    }    
    var directChildrenMap = <IDirectChildrenMap>{}; 
                            ~~~~~~~~~~~~~~~~~~~~~~
!!! error TS2352: Neither type '{ [x: number]: undefined; }' nor type 'IDirectChildrenMap' is assignable to the other.
!!! error TS2352:   Types of property 'hasOwnProperty' are incompatible.
!!! error TS2352:     Type '(v: string) => boolean' is not assignable to type '(objectId: number) => boolean'.
!!! error TS2352:       Types of parameters 'v' and 'objectId' are incompatible.
!!! error TS2352:         Type 'string' is not assignable to type 'number'.