2014-10-28 08:28:59 +01:00
tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity.ts(18,1): error TS2323: Type 'E' is not assignable to type 'C'.
Types of property 'foo' are incompatible.
Type '(x?: string) => void' is not assignable to type '(x: number) => void'.
Types of parameters 'x' and 'x' are incompatible.
2014-09-12 22:35:07 +02:00
Type 'string' is not assignable to type 'number'.
2014-07-13 01:04:16 +02:00
==== tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity.ts (1 errors) ====
// subclassing is not transitive when you can remove required parameters and add optional parameters
class C {
foo(x: number) { }
}
class D extends C {
foo() { } // ok to drop parameters
}
class E extends D {
foo(x?: string) { } // ok to add optional parameters
}
var c: C;
var d: D;
var e: E;
c = e;
~
2014-10-28 08:28:59 +01:00
!!! error TS2323: Type 'E' is not assignable to type 'C'.
!!! error TS2323: Types of property 'foo' are incompatible.
!!! error TS2323: Type '(x?: string) => void' is not assignable to type '(x: number) => void'.
!!! error TS2323: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2323: Type 'string' is not assignable to type 'number'.
2014-07-13 01:04:16 +02:00
var r = c.foo(1);
var r2 = e.foo('');