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numberToString.ts(2,5): error TS2322: Type 'number' is not assignable to type 'string'.
numberToString.ts(9,4): error TS2345: Argument of type 'number' is not assignable to parameter of type 'string'.
==== numberToString.ts (2 errors) ====
function f1(n:number):string {
return n; // error return type mismatch
~~~~~~
!!! error TS2322: Type 'number' is not assignable to type 'string'.
}
function f2(s:string):void {
}
f1(3);
f2(3); // error no coercion to string
~
!!! error TS2345: Argument of type 'number' is not assignable to parameter of type 'string'.
f2(3+""); // ok + operator promotes
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