@babel/helper-create-class-features-plugin

Compile class public and private fields, private methods and decorators to ES6

7.22.5
Source
npm

Version published: last year

Weekly downloads: 30M; decreased by-0.6%

Maintainers: 4

Weekly downloads

Created: 6 years ago

What is @babel/helper-create-class-features-plugin?

The @babel/helper-create-class-features-plugin is a helper package used internally by Babel plugins to handle the transformation of class features. It is not intended to be used directly by end users, but rather as a utility for plugin authors to create transformations for class properties, private methods, and other class-related syntax in a consistent way.

What are @babel/helper-create-class-features-plugin's main functionalities?

Class Properties

This feature allows the transformation of class properties so that they can be compiled into a format that is compatible with environments that do not support the latest ECMAScript standards. The code sample shows how a class property is transformed into a constructor assignment with a helper function.

"use strict";

function _defineProperty(obj, key, value) {
  if (key in obj) {
    Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true });
  } else {
    obj[key] = value;
  }
  return obj;
}

class Example {
  constructor() {
    _defineProperty(this, "state", {});
  }
}

Private Methods

This feature enables the transformation of private methods in a class. The code sample illustrates how a private method is transformed using WeakSets and helper functions to ensure that the method remains private and is not accessible outside the class.

"use strict";

function _classPrivateMethodInitSpec(obj, privateSet) {
  // ...implementation details
}

function _classPrivateMethodGet(receiver, privateSet, fn) {
  // ...implementation details
}

class Example {
  constructor() {
    _classPrivateMethodInitSpec(this, _privateMethod);
  }
}

var _privateMethod = new WeakSet();

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