The directory tools::R_user_dir("lexsync", "cache") names for this package,
created on first use. It is where fetch_corpus() puts a download unless told
otherwise, and it is the only place the package writes to without being handed
a path.
Details
The cache persists between sessions and lexsync never prunes it. A registered corpus is a delimited word list, and a download is refused above 200 MB, so a cache holding several large corpora can reach a few hundred megabytes. It holds nothing that cannot be fetched again, so it may be deleted at any time, whole or file by file, and the next call downloads afresh.