//// [objectLiteralFunctionArgContextualTyping2.ts]
interface I2 {
    value: string;
    doStuff: (t: string) => string;
}

function f2(args: I2) { }

f2({ hello: 1 }) 
f2({ value: '' })
f2({ value: '', what: 1 }) 
f2({ toString: (s) => s }) 
f2({ toString: (s: string) => s }) 
f2({ value: '', toString: (s) => s.uhhh }) 

//// [objectLiteralFunctionArgContextualTyping2.js]
function f2(args) { }
f2({ hello: 1 });
f2({ value: '' });
f2({ value: '', what: 1 });
f2({ toString: function (s) { return s; } });
f2({ toString: function (s) { return s; } });
f2({ value: '', toString: function (s) { return s.uhhh; } });