/src/a.js(1,6): error TS8016: Type assertion expressions can only be used in TypeScript files.
/src/a.js(2,10): error TS17008: JSX element 'string' has no corresponding closing tag.
/src/a.js(3,1): error TS1005: '</' expected.


==== /src/a.js (3 errors) ====
    0 as number;
         ~~~~~~
!!! error TS8016: Type assertion expressions can only be used in TypeScript files.
    var v = <string>undefined;
             ~~~~~~
!!! error TS17008: JSX element 'string' has no corresponding closing tag.
    
    
!!! error TS1005: '</' expected.