monocle-ts VS immutability-helper

You may be interested also in checking out the implementation of Lens in monocle-ts, one of the libraries in the fp-ts ecosystem

For anyone - anyone who's faffed around with JavaScript's spread syntax when working with nested immutable data, anyway - struggling to understand the general concept or utility of lenses, I'd encourage looking into monocle-ts. The motivation [0] that kicks off the README instantly made me a believer, and TypeScript's idiosyncratic type system makes using the library remarkably natural; it fits right in without needing to deal with anything analogous to Template Haskell.

[0] https://github.com/gcanti/monocle-ts#motivation

You could have a look at the monocle-ts library. It was designed to deal with this kind of problem.

spectacles-ts integrates seamlessly with the fp-ts ecosystem (it's built on top of the excellent monocle-ts library)

lenses help with this quite a bit, check out monocle-ts

if you're feeling fancy, try out https://www.npmjs.com/package/immutability-helper

I doubt that’s true, check this out, it’s designed with your use case in mind.

This tutorial uses the create-react-app as the starting template. The react and react-dom dependencies are both version 17.0.2. The react-scripts is version 4.0.0. The yup library is the fourth dependency and it is version 0.32.9. The fifth and last dependency is immutability-helper, version 3.1.1.

Are you perplexed by the syntax of immutability-helper? Repulsed by immer.js's use of assignment? Alarmed by lodash's lack of type safety?

Take a look at https://github.com/kolodny/immutability-helper for deeply-nested updates.