Weird Variable Glitch

[Slendy]

Hello, when I try to run my code that uses showdown.js, I get these errors:

Uncaught ReferenceError: showdown is not defined
It claims that this code line is wrong: const converter = new showdown.Converter();

Uncaught ReferenceError: getDefaultOpts is not defined
Inside the file "showdown.js" it states this line of code is wrong: globalOptions = getDefaultOpts(true),

I am not using node for my project. I am using static website files.
Please help. Thanks in advance for any assistance.

[Estevão Soares dos Santos]

Can you provide a little bit more context? Maybe create a https://codepen.io/pen/ to reproduce the issue.