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tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts(9,15): error TS2345: Argument of type '2' is not assignable to parameter of type 'string | 1'.
==== tests/cases/conformance/types/typeRelationships/typeInference/unionTypeInference.ts (1 errors) ====
// Verify that inferences made *to* a type parameter in a union type are secondary
// to inferences made directly to that type parameter
function f<T>(x: T, y: string|T): T {
return x;
}
var a1: number;
var a1 = f(1, 2);
~
!!! error TS2345: Argument of type '2' is not assignable to parameter of type 'string | 1'.
var a2: number;
var a2 = f(1, "hello");
var a3: number;
var a3 = f(1, a1 || "hello");
var a4: any;
var a4 = f(undefined, "abc");
function g<T>(value: [string, T]): T {
return value[1];
}
var b1: boolean;
var b1 = g(["string", true]);
function h<T>(x: string|boolean|T): T {
return typeof x === "string" || typeof x === "boolean" ? undefined : x;
}
var c1: number;
var c1 = h(5);
var c2: string;
var c2 = h("abc");
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