[FEATURE] arborist.prune() about arborist HOT 2 CLOSED

@ruyadorno Here's what I was thinking about at the end of our pairing session just now:

• this.buildIdealTree(options)
• for node in this.idealTree.inventory.filter(n => n.extraneous), set node.parent = null
• Call this.reify() (skips the this.buildIdealTree step, because we already have an idealTree!)

Because here's the thing: if you do npm prune --production, then you should still have dev deps in your package-lock.json file, just not in your node_modules folder. The package-lock.json file is generated by saving the ideal tree to disk, so if we mutate that to remove dev/optional/etc, then it's a problem.

And the reify() logic will already remove dev deps if you do --omit=dev, but keep them in the package-lock.json file.

Also, let's get rid of the list of names feature, since that isn't even supported in npm v6 anyway, and no one seems to mind its absence for the last few years.

from arborist.

Fixed by #95

from arborist.