${ } ? what kind of template engine is that?

From Firebase Cloud function Docconst functions = require('firebase-functions');exports.bigben = functions.https.onRequest((req, res) => { const hours = (new Date().getHours() % 12) + 1 // london is UTC + 1hr; res.status(200).send( ${'BONG '.repeat(hours)}); });Just going over some cloud function examples on firebase; ${} <- what kind of template engine is that? does anyone know?

Submitted January 16, 2018 at 03:46PM by whoiskjl