What does ':' colon do in JavaScript's import?

Question

Given the example below.

import { QueryClientContract, TransactionClientContract } from '@ioc:Adonis/Lucid/Database'

The use of the colon has confused me and never understood where the imported files could be referenced from.

user_15334379 · Answer

In import statement you are importing ambient module. I recommend you to read following documentation for more details.