How it works...

When we duplicated the saturn-v.js file to and imported the members from falcon-heavy.js, we had a potential namespace conflict. Both files export members named COUNT_DOWN_DURATION and launch. But using the as keyword, we renamed those members in order to avoid that conflict. Now the importing main.js file can use both sets of members without issue.

Renaming members can also be helpful to adding context. For example, it might be useful to rename the launch as launchRocket even if there is no conflict. This give the importing module additional context, and makes the code a bit clearer.