Well, I don't get what is the point of suggesting alternative languages that have multiline strings when we are talking about one specific language.
The topic is about how to do multiline string in Javascript in one way, and one alternative is not to use multiline strings in Javascript. It's kinda big jump from the original purpose of the topic to start suggesting alternative languages... if we are to be this slack, then we can start spamming most threads with weakly related stuff. For example, you can easily advertise coffeescript in each and every javascript thread in a similar way you did in this specific thread but do we really need want that?
So, a transpiler, with new syntax, and its own set of BS issues, including an added step in your JS workflow (for the transpiling), is better than a small library doing exactly what you want?