Lens

A lens is a getter/ setter for traversing a structure. A lens is also composable with other lenses, allowing traversing via a object or using projections. functional-lenses

Realize that the only dependency is the Object.assign from es6

Using

import { idLens } from 'ts-lens';

type MyShape = {
	a?:{
		b: {
			c: string
		}
	}
}

const withShape = idLens<MyShape>();

withShape.withAttrOr('a', { b: { c: ''}}).get({}) // ? { b: { c: ''}}
withShape.withAttrOr('a', { b: { c: ''}}).withAttr('b').withAttr('b').get({a:{
		b: {
			c: 'test
		}
	}}) // 'b'