When running the small html file below I see the following console log error:
moment.js:13 Uncaught TypeError: Cannot read property 'defineLocale' of undefined
    at moment.js:13
    at moment.js:9
    at moment.js:10
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>JS Bin</title>
    <script src="../scripts/libraries/moment.js"></script>
</head>
<body>
<script>
  var now = moment()
  console.log(now);
</script>
</body>
</html>I have also tried replacing the reference to the local library with this CDN link: https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/locale/af.js
Anyone know what this error is?
It seems to be a problem with your version of moment.js. The script that you have is only for locale, you need to include the moment.js script: 
https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.js
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.js"></script>
</head>
<body>
  <script>
    var now = moment()
    console.log(typeof moment.defineLocale)
  </script>
</body>
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