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abstractClassUnionInstantiation.ts(14,1): error TS2511: Cannot create an instance of an abstract class.
abstractClassUnionInstantiation.ts(15,1): error TS2511: Cannot create an instance of an abstract class.
abstractClassUnionInstantiation.ts(18,46): error TS2511: Cannot create an instance of an abstract class.
abstractClassUnionInstantiation.ts(19,46): error TS2511: Cannot create an instance of an abstract class.
abstractClassUnionInstantiation.ts(21,35): error TS2511: Cannot create an instance of an abstract class.
==== abstractClassUnionInstantiation.ts (5 errors) ====
class ConcreteA {}
class ConcreteB {}
abstract class AbstractA { a: string; }
abstract class AbstractB { b: string; }
type Abstracts = typeof AbstractA | typeof AbstractB;
type Concretes = typeof ConcreteA | typeof ConcreteB;
type ConcretesOrAbstracts = Concretes | Abstracts;
declare const cls1: ConcretesOrAbstracts;
declare const cls2: Abstracts;
declare const cls3: Concretes;
new cls1(); // should error
~~~~~~~~~~
!!! error TS2511: Cannot create an instance of an abstract class.
new cls2(); // should error
~~~~~~~~~~
!!! error TS2511: Cannot create an instance of an abstract class.
new cls3(); // should work
[ConcreteA, AbstractA, AbstractB].map(cls => new cls()); // should error
~~~~~~~~~
!!! error TS2511: Cannot create an instance of an abstract class.
[AbstractA, AbstractB, ConcreteA].map(cls => new cls()); // should error
~~~~~~~~~
!!! error TS2511: Cannot create an instance of an abstract class.
[ConcreteA, ConcreteB].map(cls => new cls()); // should work
[AbstractA, AbstractB].map(cls => new cls()); // should error
~~~~~~~~~
!!! error TS2511: Cannot create an instance of an abstract class.
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