Typescript: keyof typeof

Typescript keyof typeof is something nice to use in typescript.

When having an object that you use to define keys for a later reference (e.g. translations), use `keyof typeof` to extract those keys into a type.

This way you will know in the rest of the code what your options are, and references will be typesafe.

[TheFilburt]

Good Work, try to explain with a practical use case would be very helpful for future videos!

[MarufAlom]

this is typing as a voice, not a tutorial

[i-heart-google]

Reading out loud what you're writing doesn't really qualify as a tutorial.