Require should be cached?

Question

Node.js

itvdn.com/ru/blog/article/10commandments-nodejs I came
across an article, it contains the phrase "Require must be cached".
What does this mean?

Answer 1

The fact that either this is a very crooked translation or the author has problems with the presentation of thoughts, or both.
Read the spec on require and that's it. There is also about "caching" and about "the code will be executed once".