Proposal: add stringConcat and/or arrayJoin

[tychenjiajun]

No description provided.

[sindresorhus]

How would it improve the types compared to the built-ins?

[sindresorhus]

Bump

[tychenjiajun]

Sorry for being late. In my company, use https://github.com/primus/eventemitter3 in our projects. We may have an event emitter

const ee = new EventEmitter<{
    'fish.ADD': [Fish],
    'cat.ADD': [Cat]
}>();

And we also have an event handler that listens to all animals adding event

const ANIMALS = ['fish', 'cat'] as const;

function animalAddingHandler(a: Animal) {}

ANIMALS.forEach(a => ee.on(a + '.ADD', animalAddingHandler)); // Argument of type 'string' is not assignable to parameter of type '"fish.ADD" | "cat.ADD"'.(2345)

Playground

We may use as and https://github.com/sindresorhus/type-fest/blob/main/source/join.d.ts to solve this but a stringConcat and/or arrayJoin would be helpful

[sindresorhus]

Alright 👍