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functionOverloads27.ts(4,13): error TS2345: Argument of type 'number' is not assignable to parameter of type 'string'.
==== functionOverloads27.ts (1 errors) ====
function foo():string;
function foo(bar:string):number;
function foo(bar?:any):any{ return '' }
var x = foo(5);
~
!!! error TS2345: Argument of type 'number' is not assignable to parameter of type 'string'.
!!! related TS2793 functionOverloads27.ts:3:10: The call would have succeeded against this implementation, but implementation signatures of overloads are not externally visible.
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