What are all the index.ts used for?

Question

I\'ve been looking at a few seed projects and all the components seem to have a index.ts that exports * from that component. I can\'t find anywhere what it\'s actually used

Answer 1

index.ts is similar index.js in nodejs or index.html is web site hosting.

So when you say import {} from 'directory_name' it will look for index.ts inside the specified directory and import whatever is exported there.

For example if you have calculator/index.ts as

export function add() {...}
export function multiply() {...}

You can do

import { add, multiply } from './calculator';