babel-helper-replace-supers

What is babel-helper-replace-supers?

The babel-helper-replace-supers npm package is a utility within the Babel ecosystem that helps in transforming ES2015 (ES6) super calls into a form that can be understood by environments that do not support them natively. This package is particularly useful when working with classes and inheritance in JavaScript, where the 'super' keyword is used.

What are babel-helper-replace-supers's main functionalities?

Transformation of super calls in methods

This feature allows the transformation of super calls within methods of a class. The code sample shows a class where both the constructor and a method use 'super' to call their respective counterparts in the parent class.

class Child extends Parent {
  constructor() {
    super();
    console.log('Child constructor');
  }
  myMethod() {
    super.myMethod();
    console.log('Additional code in child method');
  }
}

Handling of super calls in constructors

This feature specifically handles the transformation of super calls within constructors, ensuring that the parent class's constructor is called before the child class's constructor logic is executed.

class Child extends Parent {
  constructor() {
    super();
    this.state = { key: 'value' };
    console.log('Child constructor');
  }
}

Other packages similar to babel-helper-replace-supers

core-js

Although not a direct alternative, core-js provides polyfills for many ES2015+ features, including classes and inheritance. It can be used in environments where native support for these features is not available, offering a broader scope compared to babel-helper-replace-supers which is focused only on super calls.

README

babel-helper-replace-supers

Usage

TODO