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Welcome to the babel-plugin-transform-class wiki!

Here few hints about this babel transform-class plugin

Polyfills

The most simple way to get the polyfills your target platform potentially needs with this plugin is probably to use Polyfill.io:

<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=Object.create,Object.assign"></script>

But if your prefer to fully control your polyfills, here some resources

Object.create()

The minimum support of Object.create() as used by this plugin can be simply achieved via this little snippet:

if (!Object.create) {
  Object.create = function (prototype) {
    function F() {}
    F.prototype = prototype;
    return new F();
  }
}

or this variant using the previously non official but widely supported __proto__ property:

if (!Object.create) {
  Object.create = function (prototype) {
    return {__proto__: prototype};
  }
}

See also

• A little gist with minimum support of the 2nd argument
• A faster Object.create polyfill that reuses F (doesn't support the 2nd argument to Object.create)
• The more complete MDN Object.create() polyfill. It uses Object.defineProperties() for which ES3 platforms need a Polyfill so here the one proposed by MDN.
• Object.create() on Polyfill.io

Object.assign()

Here a very minimum Object.assign() polyfill as used by this plugin (with only 2 arguments support & no return value)

if (!Object.assign) {
  Object.assign = function(target, properties) {
    for (var key in properties) target[key] = properties[key];
  };
}

• The more complete MDN Object.assign() polyfill (with better error handling & more).
• Object.assign() on Polyfill.io