It always starts by finding by walking up the path until it finds the
root directory, i.e. a directory containing
DESCRIPTION. If it
cannot find the root directory, or it can't find the specified path, it
will throw an error.
Components of the path.
Place to start search for package directory.
1 2 3 4
## Not run: package_file("figures", "figure_1") ## End(Not run)
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