Why is the assert module needed?

Question

Node.js

You can often meet but the meaning is not clear

Answer 1

What prevents you from writing in google - npm NAME and finding out about any module in the first link, which usually leads to an npm site?
For example, npm assert => https://www.npmjs.com/package/assert =>
in translation: a module is used to write unit tests.

Answer 2

For testing, perhaps.