Implement yarn install --no-optional

[callumlocke]

Do you want to request a feature or report a bug?
Request a feature

What is the current behavior?

yarn install --no-optional doesn't seem to exist (or it's not documented).

What is the expected behavior?

It should work like npm install --no-optional – i.e. don't even attempt to install optionalDependencies (as opposed to just allowing them to fail quietly).

Please mention your node.js, yarn and operating system version.

Node v7.5.0
Yarn v0.19.1
OS X El Capitan

[mourner]

It's already there but called --ignore-optional. The problem is that it's not documented currently on the yarn install docs page (along with --ignore-scripts).

[bcomnes]

--ignore-optional doesn't seem to be a work around for #2437 either, although you might expect it to work.

[sirlancelot]

Neither --no-optional nor --ignore-optional seem to work for me. I have an app with a dependency of linkifyjs@2.1.4. LinkifyJs has 3 large optionalDependencies which I don't want but Yarn will still install them.

[bestander]

merging #2987