typescript switch test per case

1switch(true) { 
2   case if(constant1 == 1): { 
3      //statements; 
4      break; 
5   } 
6   case if(constant2 == 2): { 
7      //statements; 
8      break; 
9   } 
10   default: { 
11      //statements; 
12      break; 
13   } 
14}