37 lines
1.7 KiB
Plaintext
37 lines
1.7 KiB
Plaintext
tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity4.ts(18,1): error TS2322: Type 'E' is not assignable to type 'C'.
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Types of property 'foo' are incompatible.
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Type '(x?: string) => void' is not assignable to type '(x: number) => void'.
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Types of parameters 'x' and 'x' are incompatible.
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Type 'string' is not assignable to type 'number'.
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tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity4.ts(19,9): error TS2445: Property 'foo' is protected and only accessible within class 'C' and its subclasses.
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==== tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity4.ts (2 errors) ====
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// subclassing is not transitive when you can remove required parameters and add optional parameters on protected members
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class C {
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protected foo(x: number) { }
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}
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class D extends C {
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protected foo() { } // ok to drop parameters
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}
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class E extends D {
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public foo(x?: string) { } // ok to add optional parameters
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}
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var c: C;
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var d: D;
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var e: E;
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c = e;
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~
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!!! error TS2322: Type 'E' is not assignable to type 'C'.
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!!! error TS2322: Types of property 'foo' are incompatible.
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!!! error TS2322: Type '(x?: string) => void' is not assignable to type '(x: number) => void'.
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!!! error TS2322: Types of parameters 'x' and 'x' are incompatible.
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!!! error TS2322: Type 'string' is not assignable to type 'number'.
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var r = c.foo(1);
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~~~~~
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!!! error TS2445: Property 'foo' is protected and only accessible within class 'C' and its subclasses.
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var r2 = e.foo(''); |