Pandoc's markdown strong emphasis format (e.g. **FOO**) is added to character string.
pandoc.strong.return(x)By default this function outputs (see: cat) the result. If you would want to catch the result instead, then call the function ending in .return.
John MacFarlane (2012): _Pandoc User's Guide_. https://johnmacfarlane.net/pandoc/README.html
pandoc.strong('FOO')
#> **FOO**
pandoc.strong(c('FOO', '**FOO**'))
#> **FOO** **FOO**
pandoc.strong.return('FOO')
#> [1] "**FOO**"