@babel/plugin-proposal-private-property-in-object

What is @babel/plugin-proposal-private-property-in-object?

The @babel/plugin-proposal-private-property-in-object package is a Babel plugin that allows developers to use the `#private in object` syntax to check for the existence of a private property within an object. This is part of a proposal for ECMAScript and is not yet part of the official language specification. The plugin transforms this syntax into a form that can be understood by current JavaScript engines.

What are @babel/plugin-proposal-private-property-in-object's main functionalities?

Private property existence checks

This feature allows developers to check if a private field exists in an instance of a class. The code sample demonstrates how to define a private field and then check for its existence using the `in` operator.

class MyClass {
  #myPrivateField;

  hasPrivateField(obj) {
    return #myPrivateField in obj;
  }
}

Other packages similar to @babel/plugin-proposal-private-property-in-object

@babel/plugin-proposal-class-properties

This package allows developers to use the public and private class fields syntax. It is similar to @babel/plugin-proposal-private-property-in-object in that it deals with class field declarations, but it does not specifically provide the functionality to check for private property existence within an object.

@babel/plugin-proposal-private-methods

This package enables the use of private methods and accessors in classes. Similar to @babel/plugin-proposal-private-property-in-object, it deals with private aspects of classes, but focuses on methods and accessors rather than properties.

README

@babel/plugin-proposal-private-property-in-object

This plugin transforms checks for a private property in an object

See our website @babel/plugin-proposal-private-property-in-object for more information.

Install

Using npm:

npm install --save-dev @babel/plugin-proposal-private-property-in-object

or using yarn:

yarn add @babel/plugin-proposal-private-property-in-object --dev