34 lines
1.4 KiB
Plaintext
34 lines
1.4 KiB
Plaintext
tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity2.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: number, y?: string) => void' is not assignable to type '(x: number, y: number) => void'.
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Types of parameters 'y' and 'y' are incompatible.
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Type 'string' is not assignable to type 'number'.
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==== tests/cases/conformance/classes/members/inheritanceAndOverriding/derivedClassTransitivity2.ts (1 errors) ====
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// subclassing is not transitive when you can remove required parameters and add optional parameters
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class C {
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foo(x: number, y: number) { }
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}
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class D extends C {
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foo(x: number) { } // ok to drop parameters
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}
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class E extends D {
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foo(x: number, y?: 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: number, y?: string) => void' is not assignable to type '(x: number, y: number) => void'.
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!!! error TS2322: Types of parameters 'y' and 'y' 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, 1);
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var r2 = e.foo(1, ''); |