Porting a Large ES5 JavaScript Library to ES6 Modules and Rollup
Since 2011, the PlayCanvas engine sourcebase has adhered strictly to the ES5 JavaScript specification. Since then, the JavaScript language and the surrounding tools ecosystem has moved on considerably. But PlayCanvas has steadfastly stuck to ES5. Why? Internet Explorer 11.
IE11 was released on October 17, 2013. But even today, StatCounter reports that IE11 has 2.43% of the global desktop browser market. Since PlayCanvas content is viewed by 100s of millions of end users, this is a pretty big deal.





