Summary:
`keytar` is developped by the Nuclide team and allows cross-platform access to the system's keychain. As `keytar` has a native dependency, we need to make sure Metro doesn't try to bundle it as part of our JS bundle. We are adding another rule to our electron-transform, to not bundle `.node` files (which are native node modules).
Secondly, we need to make sure, the native module is compiled for the correct version of node.js. Usually native modules are compiled for the node version that is running on the system it is installed on. However, we need to make sure it is compiled with the node version that is bundled with electron. That's exactly what `electron-rebuild` does: It recompiles all native modules with the electron's node version.
More on native modules: https://electronjs.org/docs/tutorial/using-native-node-modules
Reviewed By: jknoxville
Differential Revision: D14224402
fbshipit-source-id: 6414a53391a861a23a5d95bf6f18cd0058d9178f
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