Config to silence all peer dependency warnings

[TravisJRyan]

• I'd be willing to implement this feature (contributing guide)

Describe the user story
As a developer, I want to migrate a number of projects to pnpm from previously using npm 7 with the legacy-peer-deps flag. There are many peer dependency warnings which I know are safe, and I want a common configuration to silence these warnings to decrease noise on install without having to explicitly list all the missing peers / mismatch version issues in each repository. It would be nice if there were one flag to silence all of these.

This is how npm operates with the legacy-peer-deps flag so it can be seen as an equivalent feature when coupled with strict-peer-dependencies=false.

Describe the solution you'd like
A config silence-peer-warnings for the .npmrc peer dependencies settings which would skip peer dependency warnings altogether, exactly like npm with the --legacy-peer-deps flag. It should likely only work if strict-peer-dependencies is false.

Describe the drawbacks of your solution
The major drawback is choosing to use this flag generates risk for the user, which is why it would need to be opt-in.

Describe alternatives you've considered
We could support pattern matching in peerDependencyRules. This could make it easier to control peer dependency ignores without the danger of a blanket ignore flag, such as any react* peer dependency being okay to ignore, etc. The downside is the pattern matching could confuse users and alter the already understood API for these rules. It may need to be a new property which would clutter and complicate the understanding of the logic.

[zkochan]

We could support pattern matching in peerDependencyRules.

This sounds better. Muting these warnings is not a good solution. The peer dependency warnings are useful.