如何定义正确的地图 <X,Y> 输入打字稿，其中Y将是Parent的任何子类？

Question

I have some Parent class and amount of Child classes that extends parent. I need to define Map<sting,Y> where Y can be any of Child classes. If I try to define it as Map<string, Parent> I got transpilation error

error TS2345: Argument of type 'typeof Child' is not assignable to parameter of type 'Parent'. Property 'someParentMethod' is missing in type 'typeof Child'.

As Child automatically inherits someParentMethod from Parent I don't re declare in Child class. What is the correct way of declare needed Map argument type, so that it accepted any Child class instances?

Answer 1

Looks like you are only missing a typeof .

class a { public x; someParentMethod: () => void }
class b extends a { }

let m: Map<string, typeof a> = new Map([['a', b]]);