CssParser.to_binary

You're seeing just the function to_binary, go back to CssParser module for more information.

Specs

to_binary([map()]) :: binary()

Converts a parsed css to binary

After running:

iex> parsed = CssParser.parse("h4, h3 {color: blue; font-size: 20px;}")

You can then get a (formatted) string as follows:

iex> CssParser.to_binary(parsed)
    "h4, h3 {
        color: blue; font-size: 20px;
     }"

The function is especially useful if you need to modify the parsed css structure and then get back a binary.