40 lines
1.1 KiB
Plaintext
40 lines
1.1 KiB
Plaintext
==== tests/cases/compiler/derivedTypeIncompatibleSignatures.ts (2 errors) ====
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interface A {
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(a: string): string;
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}
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interface B extends A {
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(a: string): number; // Number is not a subtype of string. Should error.
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}
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interface C {
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new (a: string): string;
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}
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interface D extends C {
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new (a: string): number; // Number is not a subtype of string. Should error.
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}
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interface E {
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[a: string]: string;
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}
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interface F extends E {
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~
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!!! Interface 'F' incorrectly extends interface 'E':
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!!! Index signatures are incompatible:
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!!! Type 'number' is not assignable to type 'string'.
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[a: string]: number; // Number is not a subtype of string. Should error.
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}
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interface G {
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[a: number]: string;
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}
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interface H extends G {
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~
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!!! Interface 'H' incorrectly extends interface 'G':
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!!! Index signatures are incompatible:
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!!! Type 'number' is not assignable to type 'string'.
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[a: number]: number; // Should error for the same reason
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} |