babel-plugin-logical-optional-chaining

Transform Optional Chaining operators into a series of logical checks

Supports Optional Chaining features specified by MDN Web Documentation

Official Babel plugin for Optional Chaining (babel-plugin-proposal-optional-chaining) converts the ?. operator into a series of Ternary operations, which is L-E-N-G-T-H-Y.

For instance, lookup for a deeply nested object property b

const b = obj?.a?.b

using Babel's plugin transpiles to:

var _obj$a;

const b = obj === null || obj === void 0 ? void 0 : (_obj$a = obj.a) === null || _obj$a === void 0 ? void 0 : _obj$a.b;

That's exhausting...😫

The original approach for Lookup isn't short either. It consisted of REPEATING Object expressions:

const b = obj.a && obj.a.b;

NOPE!!! 🙅‍♂️

A better approach that is EXPRESSIVE yet SHORT is as shown.

const b = (obj.a || {}).b;

😊👍

Example Usage

---

obj?.prop

// INPUT
obj.a?.b;

// OUTPUT
(obj.a || {}).b;

obj?.[expr]

// INPUT
obj?.['a'];

// OUTPUT
(obj || {})['a'];

arr?.[index]

// INPUT
arr?.[0];

// OUTPUT
(arr || [])[0];


// 2D ARRAY INPUT
arr?.[0]?.[1]

// 2D ARRAY OUTPUT
((arr || [])[0] || [])[1];

func?.(args)

// INPUT
func?.(a);

// OUTPUT
(func && typeof func === "function") && func(a);

Install

---

Using npm:

npm install --save-dev babel-plugin-logical-optional-chaining

Add this plugin inside of babel.config.js or .babelrc

{
    "plugins": [
        "babel-plugin-logical-optional-chaining"
    ]
}