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This folder contains the necessary julia environment configuration. For developers, you need to activate the inst/julia/env environment to modify the julia environment. That is, if you try to modify the system.file("julia/env", package = "eam") it will not work because the system.file is a generated path and it will not be modified.
So, in short, if you want to modify the julia environment, you need:
juliaEval('using Pkg; Pkg.activate("inst/julia/env")')
juliaEval('Pkg.add("PackageName")')
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