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Test if ES6 is ~fully supported
var supportsES6 = function() {
try {
new Function("(a = 0) => a");
return true;
catch (err) {
return false;
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kenberkeley commented Mar 1, 2019

  if (typeof Symbol === 'undefined') {
    document.write('<script crossorigin="anonymous" src=",es7&flags=gated"><\/script>')

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