Fix eslint

[TorstenStueber]

I observed some errors in the code that would have been easy to prevent with improved linting rules (or linting is set up incorrectly).

This is:

• definition of variables that are not used
• (particularly important): forgetting to await the return result of a function (that returns a promise)

Context

This configuration change will make some errors less likely.

[TorstenStueber]

Seems like the eslint configuration in the project is just outdated and eslint does not work anymore. At least the npm scripts lint and lint:fix don't work.

[prayagd]

@TorstenStueber is this a very high priority one and what is it blocking or what functionality does it enable?

[TorstenStueber]

It's a chore to improve code quality and reduce silly errors.