fix: correct linting errors

[friendofdog]

Corrected linting in test/app.js. Moving the require to top-level module scope did not break tests or seem to have adverse affects on the app running locally.

Also corrected some linting errors in other files.

Closes #1199

[YasharF]

We need to rewrite a good amount of the code to address the vulnerable, deprecated, and out of date dependencies. Will address linting issues after the changes are made on the new code.