Does Node run all the code inside required modules?

Question

Are node modules run when they are required?

For example: You have a file foo.js that contains some code and some exports.

When I import the file by running the

Answer 1

Only in the sense that any other JS code is run when loaded.

e.g. a function definition in the main body of the module will be run and create a function, but that function won't be called until some other code actually calls it.