I should add test cases for these two actions.

Link below could be helpful.
https://github.com/soumak77/firebase-mock

Tweak async test cases by using async-await instead of promises.

• Should add a message for hidden expenses. ( Something like, Not showing 3 expenses because of filters)

• Add firebase.analytics() function. (#98)
• Add missing describe blocks to tests. (#106)
• Remove forceExit flag from test script and set a proper teardown for tests. (#106)
• Create a seperate test database. (#81)
• Tweak async test cases by using async-await instead of promises. (Moved to its own issue)
• Add code coverage. (#107)
• Add example env file. (#84 )

Since "extract-text-webpack-plugin" is deprecated, I should update my webpack config and use "mini-css-extract-plugin"

Link for the new plugin is down below;

https://github.com/webpack-contrib/mini-css-extract-plugin

Add describe blocks to test cases

Should configure webpack for development and production properly.

When adding an expense display currency to the user or offer them to select available currency options and save it as their default currency.

• Title is self explanatory, I should indeed add code coverage script.