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tests/cases/conformance/classes/mixinAbstractClasses.2.ts(7,11): error TS2797: A mixin class that extends from a type variable containing an abstract construct signature must also be declared 'abstract'.
tests/cases/conformance/classes/mixinAbstractClasses.2.ts(21,7): error TS2515: Non-abstract class 'DerivedFromAbstract' does not implement inherited abstract member 'abstractBaseMethod' from class 'AbstractBase & Mixin'.
tests/cases/conformance/classes/mixinAbstractClasses.2.ts(25,1): error TS2511: Cannot create an instance of an abstract class.
==== tests/cases/conformance/classes/mixinAbstractClasses.2.ts (3 errors) ====
interface Mixin {
mixinMethod(): void;
}
function Mixin<TBaseClass extends abstract new (...args: any) => any>(baseClass: TBaseClass): TBaseClass & (abstract new (...args: any) => Mixin) {
// error expected: A mixin class that extends from a type variable containing an abstract construct signature must also be declared 'abstract'.
class MixinClass extends baseClass implements Mixin {
~~~~~~~~~~
!!! error TS2797: A mixin class that extends from a type variable containing an abstract construct signature must also be declared 'abstract'.
mixinMethod() {
}
}
return MixinClass;
}
abstract class AbstractBase {
abstract abstractBaseMethod(): void;
}
const MixedBase = Mixin(AbstractBase);
// error expected: Non-abstract class 'DerivedFromAbstract' does not implement inherited abstract member 'abstractBaseMethod' from class 'AbstractBase & Mixin'.
class DerivedFromAbstract extends MixedBase {
~~~~~~~~~~~~~~~~~~~
!!! error TS2515: Non-abstract class 'DerivedFromAbstract' does not implement inherited abstract member 'abstractBaseMethod' from class 'AbstractBase & Mixin'.
}
// error expected: Cannot create an instance of an abstract class.
new MixedBase();
~~~~~~~~~~~~~~~
!!! error TS2511: Cannot create an instance of an abstract class.
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