Todo and rmd-generated LaTeX document

Question

How to use the todo package in R Markdown-generated LaTeX documents?

To load packages, it is possible to add them to the document's header with header-includes:. This successfully works with \usepackage{hyperref} and its styling (\hypersetup{colorlinks=true}), but doesn't seem to allow to add inline todo{}s.

---
title: "Untitled"
author: "Test"
date: "7/24/2017"
output: pdf_document
header-includes:
   - \usepackage{todo}
   - \usepackage{hyperref}
   - \hypersetup{colorlinks=true}
---

[Link styling works](www.example.com) but \todo{todo does not}.

which generates

Answer 1

A good alternative is use the \todo command but from the todonotes package. Example:

---
title: "Untitled"
author: "Test"
date: "7/24/2017"
output: pdf_document
header-includes:
   - \usepackage[colorinlistoftodos]{todonotes}
   - \hypersetup{colorlinks=true,linkcolor=blue!30!black}
   - \geometry{rmargin=1.5in} 
---
[Link styling works](www.example.com)
\todo{Without load \texttt{hyperref} yourself!} 
as well as margin notes (but add some space to the right margin!)  
\todo[color=green!50,inline]{... or use  \texttt{todonotes} inline}.
\listoftodos