[core] Fix missing type peer deps #17211
Merged
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Only merge if either node 8 has reached end of life (end of 2019) or npm was bumped in node 8 to 6.11
Closes #17121
peerDependenciesMeta
is implemented in[email protected]
,[email protected]
andpnpm@?
.Rule of thumb: If a type package has side effects it is a peer that has to be installed at app level. Otherwise you get type mismatches if different versions are installed. A side-effect is module augmentation which is most often used to make a type globally available (in react this happens by adding the JSX namespace). Packages without side-effects are usually safe to list as direct dependencies since multiple versions don't necessarily create clashes (here
@types/react-transition-group
).