From @greghuc on 2016-09-01 15:55

Current Coffeescript is incompatible with template literals, specifically tagged template literals. As such, direct support for template literals should be considered for coffeescript nextgen.

Specifically, calling a tagged template literal looks this:

var a = 5;
var b = 10;

function tag(strings, ...values) {
  ...
  return "Bazinga!";
}

tag`Hello ${ a + b } world ${ a * b }`;

Coffeescript already uses backticks to embed javascript:

hi = `function() {
  return [document.title, "Hello JavaScript"].join(": ");
}`

Unless I've missed a trick, it's currently impossible to use a tagged template literal in Coffeescript by embedding the relevant ES6 javascript.

FYI, I ran into this problem when exploring the newish bel DOM templating library. Since it uses tagged template strings, I believe it's inoperable with current Coffeescript. This is the first time I've seen incompatibility between Coffeescript and Javascript..