Overload order affects assignability of abstract constructors overloaded with regular constructors in interfaces

🔎 Search Terms

abstract constructors, constructor overloading, overload order, intersection, type aliases, interfaces, assignability

🕗 Version & Regression Information

• This seems like a bug
• This is the behavior in every version I tried since abstract constructors were added (4.2)

⏯ Playground Link

https://www.typescriptlang.org/play/?noUncheckedIndexedAccess=true&ts=5.7.0-dev.20240904#code/C4TwDgpgBAwgjFAvFAhgIwM7AE4oMbBQB2EA7lABQoBcUcAlEgHx0BQoksATEsWZTShdGiFl1asAlkWARsAM3zQAglAgAPWUQAmGWHAA03KAG8AvlAD0lqAFFs2APbZaMFESKPCKDBkkBzIlQg9CxcAig8RyIwgFcCZygOaGBHVGJogFpQnHxCKJiceNTsJPAIADopGTlFPGgAITVNCB09GC4jeFMLaygAeQBrCW0IPAAbFGxocYhvWmVWUYmpmbmoNFoGiT6AFQALCAxoVY2vfbV5eTHgSQA3CHGQVExcglYSchQKBiNP1Aowj+-DQP3owPIoOEEhQvDQVhsQ1Y8OQsL69icLlg7k83l8ARCIVe4Xy0TiCVKySSaVhniI2WJeUiZKKFLKkCq7HKUGUjIIADFJNgsLxugAybhczi8sJ5AAyPkIyA6UAl8BGY0m0ygs28fOAguFwAW+sNWCWmtOupesoICqwJttwHtwB2NgORxO2p8fkC6Fm1LU+AujkO2FYORJZqVNrezsVEf1Lt4kby0YkKNjUaFIvRDmcrhxXlQ+MCwSzTIK5JK7JSNIy9NTESrrJrySqTYNOZj8L6SORKaTioRA2GneTyF7iOGQA

💻 Code

type C1 = abstract new (a: 1) => 1
type C2 = new (a: 2) => 2

interface A extends C1, C2 {} // Error: Cannot assign an abstract constructor type to a non-abstract constructor type.
interface B extends C2, C1 {} // Ok

declare let a: A
declare let b: B

// These are both effectively abstract
new a(1), new a(2), new b(1), new b(2)

a = b // Ok
b = a // Error: Cannot assign an abstract constructor type to a non-abstract constructor type.

type AbstractFirst = C1 & C2
type AbstractLast = C2 & C1

declare let abstractFirst: AbstractFirst
declare let abstractLast: AbstractLast

// These are assignable to each oher
abstractFirst = abstractLast
abstractLast = abstractFirst

b = abstractFirst // Error: Cannot assign an abstract constructor type to a non-abstract constructor type.
abstractFirst = b // Ok

b = abstractLast // Ok
abstractLast = b // Ok

🙁 Actual behavior

It seems that interfaces with both abstract and regular constructor overloads are only assignable from types with non-abstract first constructor overload.

🙂 Expected behavior

I don't expect any difference here.

Additional information about the issue

No response

リンクされている TypeScript Playground の再現例から始め、abstract と通常のコンストラクターオーバーロードを両方の順序で含むインターフェースと交差型の代入可能性を比較します。コンパイラーのコンストラクターオーバーロードと代入可能性のチェックを追跡し、その後、オーバーロードの順序を逆にしても例に表示されるエラーが変わらなくなっていることを確認します。