idx to optional chaining

Facebook's idx was a useful helper prior to the optional chaining maturing as a standard because it played nicely with Flow. But now optional chaining is stage 4 and has Flow/Typescript support. This codemod will convert transform most usages of idx.

Usage

foo@bar:~$ git clone git@github.com:cdlewis/idx-to-optional-chaining.git
foo@bar:~$ npm install -g jscodeshift
foo@bar:~$ jscodeshift -t idx-to-optional-chaining/index.js file-to-transform.js

Example

Before:

import idx from "idx";

let a = idx(a, _ => _.b);
let b = idx(a, _ => _.b.c);
let c = idx(a, _ => _.b.c.d);
let d = idx(a, _ => _[0][1][2]);
let e = idx(a, _ => _.b[0].c[variable]);

After:

let a = a?.b
let b = a?.b?.c
let c = a?.b?.c?.d
let d = a?.0?.[1]?.[2]
let e = a?.b?.[0]?.c?.[variable]