43 lines
2 KiB
Plaintext
43 lines
2 KiB
Plaintext
tests/cases/compiler/implementGenericWithMismatchedTypes.ts(7,7): error TS2420: 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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tests/cases/compiler/implementGenericWithMismatchedTypes.ts(16,7): error TS2420: 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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==== 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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!!! error TS2420: Class 'C<T>' incorrectly implements interface 'IFoo<T>'.
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!!! error TS2420: Types of property 'foo' are incompatible.
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!!! error TS2420: Type '(x: string) => number' is not assignable to type '(x: T) => T'.
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!!! error TS2420: Types of parameters 'x' and 'x' are incompatible.
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!!! error TS2420: 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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!!! error TS2420: Class 'C2<T>' incorrectly implements interface 'IFoo2<T>'.
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!!! error TS2420: Types of property 'foo' are incompatible.
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!!! error TS2420: Type '<Tstring>(x: Tstring) => number' is not assignable to type '(x: T) => T'.
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!!! error TS2420: 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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} |