Microsoft/TypeScript

TS is overly picky when declaring a class constructor type

Open

#29.707 aperta il 3 feb 2019

Vedi su GitHub
 (11 commenti) (6 reazioni) (0 assegnatari)TypeScript (6726 fork)batch import
BugDomain: classesGood First IssueHelp Wanted

Metriche repository

Star
 (48.455 star)
Metriche merge PR
 (Merge medio 6g 17h) (9 PR mergiate in 30 g)

Descrizione

TypeScript Version: 3.4.0-dev.20190202

Search Terms: class, extend, constructor, any[]

Code

type ClassConstructor = new(...args: any[]) => {}

function mixin<C extends ClassConstructor>(Class: C) {
  return class extends Class {}
}

Expected behavior:

I should be able to replace ...args: any[] with ...args: unknown[], or any other signature.

Actual behavior:

Error: Type 'C' is not a constructor function type. [2507]

Playground Link: https://www.typescriptlang.org/play/index.html#src=type%20ClassConstructor%20%3D%20new(...args%3A%20unknown%5B%5D)%20%3D%3E%20%7B%7D%0D%0A%0D%0Afunction%20mixin%3CC%20extends%20ClassConstructor%3E(Class%3A%20C)%20%7B%0D%0A%20%20return%20class%20extends%20Class%20%7B%7D%0D%0A%7D

Guida contributor