@babel/plugin-proposal-optional-chaining

What is @babel/plugin-proposal-optional-chaining?

The @babel/plugin-proposal-optional-chaining package is a Babel plugin that allows developers to use the optional chaining syntax in JavaScript. Optional chaining enables developers to read the value of a property located deep within a chain of connected objects without having to check that each reference in the chain is valid.

What are @babel/plugin-proposal-optional-chaining's main functionalities?

Optional Property Access

Safely access a property on an object. If 'obj' is null or undefined, 'value' will be undefined instead of throwing an error.

const value = obj?.prop;

Optional Method Calls

Safely call a method on an object. If 'obj' or 'obj.method' is null or undefined, 'result' will be undefined instead of throwing an error.

const result = obj?.method?.();

Optional Element Access

Safely access an array element. If 'arr' is null or undefined, 'item' will be undefined instead of throwing an error.

const item = arr?.[index];

Other packages similar to @babel/plugin-proposal-optional-chaining

es5-dot-prop

This package allows safe property access on objects but does not use the optional chaining syntax. It's a utility function rather than a Babel plugin and requires manual function calls.

lodash.get

Lodash provides a 'get' function that allows safe access to object properties. It's similar in purpose to optional chaining but uses a different syntax and is a part of the larger Lodash utility library.

README

@babel/plugin-proposal-optional-chaining

Transform optional chaining operators into a series of nil checks

See our website @babel/plugin-proposal-optional-chaining for more information.

Install

Using npm:

npm install --save-dev @babel/plugin-proposal-optional-chaining

or using yarn:

yarn add @babel/plugin-proposal-optional-chaining --dev