20 lines
835 B
Plaintext
20 lines
835 B
Plaintext
==== tests/cases/conformance/types/objectTypeLiteral/callSignatures/callSignaturesThatDifferOnlyByReturnType2.ts (2 errors) ====
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// Normally it is an error to have multiple overloads which differ only by return type in a single type declaration.
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// Here the multiple overloads come from multiple bases.
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interface I<T> {
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foo(x: number): T;
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}
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interface A extends I<number>, I<string> { }
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~
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!!! Interface 'A' cannot simultaneously extend types 'I<number>' and 'I<string>':
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!!! Named properties 'foo' of types 'I<number>' and 'I<string>' are not identical.
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var x: A;
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// BUG 822524
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var r = x.foo(1); // no error
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var r2 = x.foo(''); // error
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~~
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!!! Argument of type 'string' is not assignable to parameter of type 'number'.
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