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.
@babel/plugin-proposal-private-property-in-object
⚠️ This version of the package (v7.21.0-placeholder-for-preset-env.1
) is not meant to
be imported. Use any other version of this plugin or, even better, the
@babel/plugin-transform-private-property-in-object package.
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