TS2377

error TS2377: Constructors for derived classes must contain a ‘super’ call.

Bad Code ❌

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abstract class Animal {
abstract name: string;
}

class Dog extends Animal {
public name;

constructor(name: string) {
this.name = name;
}
}

Fixed Code ✔️

Every constructor in a derived class has to call the super method to invoke the constructor of the base class. It has to be the very first call:

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abstract class Animal {
abstract name: string;
}

class Dog extends Animal {
public name;

constructor(name: string) {
super();
this.name = name;
}
}

Video: https://youtu.be/62J_eQsK0e0?t=635