==== tests/cases/conformance/types/typeRelationships/typeInference/genericCallWithFunctionTypedArguments5.ts (2 errors) ==== // Generic call with parameter of object type with member of function type of n args passed object whose associated member is call signature with n+1 args function foo(arg: { cb: (t: T) => U }) { return arg.cb(null); } var arg = { cb: (x: T) => '' }; var r = foo(arg); // {} // more args not allowed var r2 = foo({ cb: (x: T, y: T) => '' }); // error ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ !!! Argument of type '{ cb: (x: T, y: T) => string; }' is not assignable to parameter of type '{ cb: (t: any) => string; }'. !!! Types of property 'cb' are incompatible: !!! Type '(x: T, y: T) => string' is not assignable to type '(t: any) => string'. var r3 = foo({ cb: (x: string, y: number) => '' }); // error ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ !!! Argument of type '{ cb: (x: string, y: number) => string; }' is not assignable to parameter of type '{ cb: (t: string) => string; }'. !!! Types of property 'cb' are incompatible: !!! Type '(x: string, y: number) => string' is not assignable to type '(t: string) => string'. function foo2(arg: { cb: (t: T, t2: T) => U }) { return arg.cb(null, null); } // fewer args ok var r4 = foo(arg); // {} var r5 = foo({ cb: (x: T) => '' }); // {} var r6 = foo({ cb: (x: string) => '' }); // string var r7 = foo({ cb: () => '' }); // string