TypeScript Class Method Not Being Recognized in the Parent Class After Extend
I'm following best practices but I'm working on a project and hit a roadblock... I'm working with an scenario with class inheritance in TypeScript where a method defined in the parent class seems to be unrecognized in the child class after extension. I have a base class `Animal` with a method `speak`, and a derived class `Dog` that extends `Animal`. However, when I try to call `speak` on an instance of `Dog`, I get a runtime behavior stating `this.speak is not a function`. Here's the code I've written: ```typescript class Animal { speak() { console.log('Animal speaks'); } } class Dog extends Animal { constructor() { super(); } bark() { this.speak(); // This is where I'm getting the behavior console.log('Woof!'); } } const dog = new Dog(); dog.bark(); // Expected to call speak() and log 'Animal speaks' followed by 'Woof!' ``` When I run this code in TypeScript version 4.5.4, I receive the behavior message: ``` TypeError: this.speak is not a function ``` I've double-checked the method names and the inheritance, and everything seems correct. I even tried adding a type annotation for `this` in the `bark` method, but that didn't help. Is there something I might be overlooking regarding the method resolution in TypeScript classes, or is there a specific configuration I need to ensure that the methods from the parent class are properly recognized in the child class? My development environment is Ubuntu. I'm on Debian using the latest version of Typescript. I've been using Typescript for about a year now.