How do you typecast in TypeScript

Question

How do I handle typecasting from SymbolInfo to MarkerSymbolInfo in TypeScript for this code?

module Symbology { 

    export class SymbolFactory { 

        createStyle( symbolInfo : SymbolInfo) : any { 
            if (symbolInfo == null)
            {
                 return null;
            }

            if (symbolInfo.symbolShapeType === "marker") {      

                // how to cast to MarkerSymbolInfo          
                return this.createMarkerStyle((MarkerSymbolInfo) symbolInfo);
            }                                  
        }

        createMarkerStyle(markerSymbol : MarkerSymbolInfo ): any { 
            throw "createMarkerStyle not implemented";
        }              

    }
}

Answer 1

Casting:

return this.createMarkerStyle(<MarkerSymbolInfo> symbolInfo);

Or

Casting compatible with tsx mode:

return this.createMarkerStyle(symbolInfo as MarkerSymbolInfo);

This is a compile-time cast, and not a runtime cast.