Steps to create an exported dataset in an R package with {usethis}

external-data-usethis.md

1. In your package project, run usethis::use_data_raw("demo-data") to set up a data-raw/ folder with a demo-data.R file inside.
2. Write a script in demo-data.R to produce the data object (e.g. demo_df).
3. Insert and run the line usethis::use_data(demo_df) in demo-data.R, which will save the data object to a data/demo_df.rda file.
4. Run usethis::use_r("demo-data") to create a corresponding R/demo-data.R file where you can document the data.
5. In R/demo-data.R, quote the name of the data object (i.e. "demo_df") and put {roxygen2} code above it (probably at least @title, @description and maybe @format, which might contain a \describe{} block to explain the content of your object, itself containing an \item{} to describe each column if it's a data.frame).
6. Run devtools::document() to generate the man/ pages for the data.
7. Run devtools::load_all() to reload your package and make demo_df available in your session.
8. Once pushed, users can attach the package and access demo_df by name, or access it with package::demo_df namespacing.