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Create proposal for a MetaMask wallet library
We are considering building a wallet library, which would encapsulate all shared functionality of the extension and mobile projects. Both projects could use this library instead of importing and setting up each controller independently. This library would also include services, a shared JSON-RPC pipeline, etc.
This issue is for writing a technical proposal for this idea, and for any related architectural changes.
See here for a prototype: https://github.com/MetaMask/core/pull/4451
See here for an earlier planning phase: https://github.com/MetaMask/MetaMask-planning/issues/1861