[OpenLayers-Users] OL 4.2 with TypeScript:How to extend index.d.ts?

[Ignacio Talavera]

I'm using Openlayers v4.2.0 with typescript so I installed the
typesDefinition with npm install --save @types/openlayers
I need to execute the method *getFullTileRange()* from ol.tilegrid.TileGrid
type  but is not defined in the type definition from @types/openlayers
(index.d.ts).
First I get a compilation error because getFullTileRange method is not
declared in index.d.ts. I try to modify index.d.ts adding this method
(inside my IDE to skip compilation errors) but running my app I  get this
exection error

*TypeError*: *tileGrid.getFullTileRange is not a function*.

How can I extend index.d.ts to execute that function?

Thanks!
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