optionalPeerDependencies do not exist

[conradstrassburger]

I stumbled across this again while developing a PR.
In package.json "optionalPeerDependencies" are defined. According to the npm docs, there is no such thing. When running npm install in any configuration, these dependencies aren't installed.

peerDependencies and optionalDependencies exist on their own.

I'd argue that for here, peerDependencies would be just fine.
If truly optional peer dependencies are what is wanted, one needs to use peerDependenciesMeta.

[Zsar]

Yes, this is an odd thing. It is present in IntelliJ IDEA's autocomplete support for package.json and "seems to do the right thing"... but arguably, doing nothing is mostly the right thing in this case, so that's kind of a low bar in this case.

... I am beginning to think that this is some sort of solo effort on the part of Jetbrains though, so all in favour of replacing it with the documented version. All listed optionalPeerDependencies should thence be converted to have an "optional": true entry in peerDependenciesMeta as per regular npm documentation.