(JS-0125) Found the usage of undeclared variables

## Description
Variables that aren't defined, but accessed may throw reference errors at runtime. > **NOTE**: In browser applications, DeepSource recommends the use of ESModules over regular `text/javascript` scripts. > Using variables that are injected by scripts included in an HTML file is currently not supported.

## Occurrences
There are 5 occurrences of this issue in the repository.

See all occurrences on DeepSource → [app.deepsource.com/gh/IntegerAlex/hasty-server/issue/JS-0125/occurrences/](https://app.deepsource.com/gh/IntegerAlex/hasty-server/issue/JS-0125/occurrences/)