Merge of Union

[dmfilipenko]

🤔 Question

Describe your question

What is the best way to transform this

type A = {id: string} 
type B = {uuid: string} | {name: string}

to something like this

type C = {
		id: string;
    	uuid: string;
	} | {
		id: string;
		name: string;
	}

Search tags, topics

merge unions

[millsp]

Hi @dmfilipenko, I just released an upgraded version of Either for you. Now you can do this:

import {O, U} from 'ts-toolbelt'

type A = {id: string}
type B = {uuid: string} | {name: string}

type t = O.Either<U.Merge<B | A>, 'id' | 'uuid', 0>

TypeScript does not perform excess property checks on unions, so I guess you'd rather use the first:

type t = O.Either<U.Merge<B | A>, 'id' | 'uuid'>

Cheers

[dmfilipenko]

@pirix-gh <3 thank you!