I am seeking a method to inherit the parameter types of a parent's constructor into the child's constructor. For example:
class B extends A {
constructor (input) {
super(input);
}
}
I attempted the following:
class B extends A {
constructor (input : ConstructorParameters<typeof super>) {
super(input);
}
}
However, I encountered an error from eslint stating 'super' is not defined.
To correctly pass the parameter as
ConstructorParameters<typeof A>[0]class A {
title: string;
constructor(title: string) {
this.title = title;
}
}
class B extends A {
constructor(title: ConstructorParameters<typeof A>[0]) {
super(title);
}
}
Another solution to consider is mentioned in a comment:
constructor(title: ConstructorParameters<typeof A>) {
super(...title);
}
When you don't alter the constructor signature in the subclass, TypeScript truly shines by automatically including the necessary constructor in the extended class. This eliminates the need for manually adding the constructor in the derived class.
class A {
input: string;
constructor(input: string) {
this.input = input;
}
}
class B extends A {}
new B(); /* Error
^^^^^^^
Expected 1 arguments, but got 0.(2554) */
new B('myInput'); // ok
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