How do I use optimist in Ruby?

Question

Whenever I run yarn, I get a warning that this gem has been deprecated and that I should switch to optimist as soon as possible:

$ yarn
[DEPRECATION] This gem has been renamed to optimist and will no longer be supported. Please switch to optimist as soon as possible.

Because of this, I ran gem install optimist to install optimist, but I have no idea how to use it. If I simply try to run the command optimist, it doesn't do anything:

$ optimist

Command 'optimist' not found, did you mean:

How do I use optimist? Specifically, how do I use it to replace yarn, since it will no longer be supported in the future?

Answer 1

The gem yarn depends on trollop which is renamed to optimist. The error is just a deprecation warning so everything will continue to work.

If you want to remove the error, one should update the yarn gem to use optimist. However, since the yarn gem is so old (2011), and there is a npm/js library called yarn which is used to install npm packages: are you sure you need to use the yarn gem at all?