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bendc/supportsES6.js

Created August 25, 2016 08:05
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Test if ES6 is ~fully supported
Raw
supportsES6.js
var supportsES6 = function() {
try {
new Function("(a = 0) => a");
return true;
}
catch (err) {
return false;
}
}();
@kenberkeley
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kenberkeley commented Mar 1, 2019 •
edited 

<html>
<head>
  <script>
  if (typeof Symbol === 'undefined') {
    document.write('<script crossorigin="anonymous" src="https://polyfill.io/v3/polyfill.min.js?features=es6,es7&flags=gated"><\/script>')
  }
  </script>
</head>
<body>
</body>
</html>

@cai-zhuo
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cai-zhuo commented Mar 6, 2023 •
edited

@triblondon Yup, the critical test is the a = 0 (all browsers supporting default parameters have a fairly complete support of ES6 -- for example, Edge 13 will be rejected by this test despite a decent ES6 coverage).

I wanna know how to prove “all browsers supporting default parameters have a fairly complete support of ES6”
Thankfully， if you can show links or refs

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