How do I import my own custom swift file into a project?

I have a small swift file with some extensions and helper functions that I like to use in all of my projects. It is platform-agnostic. Right now, I've been pasting a separate copy of the file into all of my projects whenever I need to use it. This is obviously not ideal because if I need to modify the file, then I have to update all of the copies floating around in each of my projects.

How to I import a file from outside my project into my project without making a separate copy?

I'm coming from Python where you could simply write import [module name] at the top of your file and it would import that module into your script.

Here's a link to the file in case anyone's interested. https://drive.google.com/file/d/1keOZ98BQS6ErqTn_xXl10RWrc7WNJdFw/view?usp=sharing

You can compose this file into an actual module and import it exactly as you would in Python, the Swift Package Manager helps with this.