Last week, I gave a presentation by the same name as this article at Tencent Frontend Conference in Shenzhen, China. In this article, I’m adapting its transcript to a format more suitable for Pony Foo. I hope you enjoy it! What’s TC39? TC39 means Technical Committee number 39. It’s part of ECMA, the institution which standardizes the JavaScript language under the “ECMAScript” specification. The EC