32 lines
1.2 KiB
Plaintext
32 lines
1.2 KiB
Plaintext
==== tests/cases/compiler/implementGenericWithMismatchedTypes.ts (2 errors) ====
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// no errors because in the derived types the best common type for T's value is Object
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// and that matches the original signature for assignability since we treat its T's as Object
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interface IFoo<T> {
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foo(x: T): T;
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}
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class C<T> implements IFoo<T> { // error
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~
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!!! Class 'C<T>' incorrectly implements interface 'IFoo<T>':
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!!! Types of property 'foo' are incompatible:
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!!! Type '(x: string) => number' is not assignable to type '(x: T) => T':
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!!! Types of parameters 'x' and 'x' are incompatible:
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!!! Type 'string' is not assignable to type 'T'.
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foo(x: string): number {
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return null;
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}
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}
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interface IFoo2<T> {
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foo(x: T): T;
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}
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class C2<T> implements IFoo2<T> { // error
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~~
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!!! Class 'C2<T>' incorrectly implements interface 'IFoo2<T>':
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!!! Types of property 'foo' are incompatible:
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!!! Type '<Tstring>(x: Tstring) => number' is not assignable to type '(x: T) => T':
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!!! Type 'number' is not assignable to type 'T'.
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foo<Tstring>(x: Tstring): number {
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return null;
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}
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} |