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tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity4.ts(18,1): error TS2322: 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.
Type 'number' is not assignable to type 'string'.
tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity4.ts(19,11): error TS2445: Property 'foo' is protected and only accessible within class 'C' and its subclasses.
==== tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity4.ts (2 errors) ====
// subclassing is not transitive when you can remove required parameters and add optional parameters on protected members
class C {
protected foo(x: number) { }
}
class D extends C {
protected foo() { } // ok to drop parameters
}
class E extends D {
public foo(x?: string) { } // ok to add optional parameters
}
var c: C;
var d: D;
var e: E;
c = e;
~
!!! error TS2322: Type 'E' is not assignable to type 'C'.
!!! error TS2322: Types of property 'foo' are incompatible.
!!! error TS2322: Type '(x?: string) => void' is not assignable to type '(x: number) => void'.
!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2322: Type 'number' is not assignable to type 'string'.
var r = c.foo(1);
~~~
!!! error TS2445: Property 'foo' is protected and only accessible within class 'C' and its subclasses.
var r2 = e.foo('');
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