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tests/cases/compiler/mismatchedGenericArguments1.ts(5,4): error TS2416: Property 'foo' in type 'C<T>' is not assignable to the same property in base type 'IFoo<T>'.
Type '(x: string) => number' is not assignable to type '<T>(x: T) => T'.
Types of parameters 'x' and 'x' are incompatible.
Type 'T' is not assignable to type 'string'.
tests/cases/compiler/mismatchedGenericArguments1.ts(11,4): error TS2416: Property 'foo' in type 'C2<T>' is not assignable to the same property in base type 'IFoo<T>'.
Type '<U>(x: string) => number' is not assignable to type '<T>(x: T) => T'.
Types of parameters 'x' and 'x' are incompatible.
Type 'T' is not assignable to type 'string'.
==== tests/cases/compiler/mismatchedGenericArguments1.ts (2 errors) ====
interface IFoo<T> {
foo<T>(x: T): T;
}
class C<T> implements IFoo<T> {
foo(x: string): number {
~~~
!!! error TS2416: Property 'foo' in type 'C<T>' is not assignable to the same property in base type 'IFoo<T>'.
!!! error TS2416: Type '(x: string) => number' is not assignable to type '<T>(x: T) => T'.
!!! error TS2416: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2416: Type 'T' is not assignable to type 'string'.
!!! related TS2208 tests/cases/compiler/mismatchedGenericArguments1.ts:2:8: This type parameter might need an `extends string` constraint.
return null;
}
}
class C2<T> implements IFoo<T> {
foo<U>(x: string): number {
~~~
!!! error TS2416: Property 'foo' in type 'C2<T>' is not assignable to the same property in base type 'IFoo<T>'.
!!! error TS2416: Type '<U>(x: string) => number' is not assignable to type '<T>(x: T) => T'.
!!! error TS2416: Types of parameters 'x' and 'x' are incompatible.
!!! error TS2416: Type 'T' is not assignable to type 'string'.
!!! related TS2208 tests/cases/compiler/mismatchedGenericArguments1.ts:2:8: This type parameter might need an `extends string` constraint.
return null;
}
}
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