What sets apart optionalDependencies from peerDependencies in the Meta optional?

Why are both marking dependency as optional and what is the specific use-case of each?

Is peerDependenciesMeta intended for npm packages while optionalDependencies is meant for projects?

For example, in my npm package, certain modules require dependency foo, but if it isn't imported, the corresponding peerDependency can remain uninstalled.

Answer №1

Summary

peerDependenciesMeta allows for defining peerDependencies as optional while optionalDependencies enables the specification of regular dependencies as optional.


Items listed in optionalDependencies function similarly to those listed in dependencies. This means that transitive optionalDependencies may be found in nested node_modules, and installed packages could possess their own versions of their optionalDependencies, possibly conflicting with each other.

peerDependencies are treated as shared (singletons) and are placed in the top-level node_modules directory. If conflicts arise, they should not be installed in nested node_modules. The use of peerDependenciesMeta provides the ability to label certain peerDependencies as optional.

For more information, refer to the npm documentation on optionalDependencies and peerDependencies.

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