Do unused imports effect bundle sizes

Question

Simple question really, was just wondering does an import which is not used effect bundle sizes or does it get treeshaken out, I am building experience in this area, thanks

Answer 1

Yes, all imports have impact on bundle sizes.

An other tip :

When you import something try to do like this :

import last from 'lodash/last' 

and not like this :

import { last } from 'lodash'

In the first case you just import the part of package you will use.

In the second case, you import all of package.