there are two classes as follows
// Parent.ts
import {Sub} from "./Sub";
export class Parent {
public getSub() {
return new Sub();
}
}// Sub.ts
import {Parent} from "./Parent";
export class Sub extends Parent {}running js after ts compilation throws an error
Uncaught TypeError: Object prototype may only be an Object or null: undefinedit seems that the ts compiler defines the Sub class first when it sees a reference to the Sub class in the Parent class, and before the Parent class is defined, it will cause Parent to throw a TypeError. for the undefined,
.how can I change it to let the ts compiler define Parent first