For an output file ‘FOO.html’, ‘FOO.md’ should be deleted if ‘FOO.Rmd’ exists, and ‘FOO.html’ should be deleted when ‘FOO.Rmarkdown’ exists (because ‘FOO.Rmarkdown’ should generate ‘FOO.markdown’ instead) or neither ‘FOO.Rmarkdown’ nor ‘FOO.Rmd’ exists (because a plain Markdown file should not be knitted to HTML).
Whether to preview the file list, or just delete the files. If
you are sure the files can be safely deleted, use
preview = TRUE, a logical vector indicating if each file
was successfully deleted; for
preview = FALSE, the file list is
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