core-js/modules/es6.string.raw.js

Standard library

var $def      = require('./$.def')
  , toIObject = require('./$.to-iobject')
  , toLength  = require('./$.to-length');

$def($def.S, 'String', {
  // 21.1.2.4 String.raw(callSite, ...substitutions)
  raw: function raw(callSite){
    var tpl = toIObject(callSite.raw)
      , len = toLength(tpl.length)
      , sln = arguments.length
      , res = []
      , i   = 0;
    while(len > i){
      res.push(String(tpl[i++]));
      if(i < sln)res.push(String(arguments[i]));
    } return res.join('');
  }
});