You can already pass array options with yargs if you specify the option more than once. For example:

electron-installer-redhat --src src_dir --dest dest_dir --arch x86_64 --options.categories Audio --options.categories Music

That will pass the array ['Audio', 'Music']

No, you have to specify at least two values so that the command recognizes the option is an array.
For example, it doesn't work:

electron-installer-redhat --src src_dir --dest dest_dir --arch x86_64 --options.mimeType x-scheme-handler/inkdrop

It recognizes mimeType as string, not array, which causes an error.

No, you have to specify at least two values so that the command recognizes the option is an array.
For example, it doesn't work:

electron-installer-redhat --src src_dir --dest dest_dir --arch x86_64 --options.mimeType x-scheme-handler/inkdrop

It recognizes mimeType as string, not array, which causes an error.

Sure, but as a workaround, you can just do:

electron-installer-redhat --src src_dir --dest dest_dir --arch x86_64 --options.mimeType x-scheme-handler/inkdrop --options.mimeType ''

Only until a new release with this code gets published.

Added a definition for options.requires