Peer Dependencies

Peer Dependencies are used to declare indirect or optional dependencies between extensions. This can be used to enable some functionality or configuration only when some other extension is available, or to avoid a dependency loop. Extensions must form a directed acyclic graph, there must not be a dependency path from one extension back to itself.

Use Cases

Generally the intended use case for peerDependencies is to provide functionality only when some other extension is present. For example, you may have an extension that requires special code to interact with React, but is also usable without React, so you could have ReactProviderExtension in the peerDependencies array.

Another example would be to provide Markdown serialization or import for an extension that provides some custom node type, but only if the MarkdownExtension is present in that editor.