Surprising to me that (in the context of TypeScript) ECMAScript 4, ActionScript, and Google Closure were not mentioned! Especially the first two; Macromedia/Adobe and Netscape/Mozilla have been working on baking TypeScript into JavaScript proper for a whole decade before HTML5, the mobile boom, and the associated problems have emerged. ES4/AS3 even had a nearly identical syntax.

What's even more interesting is that Microsoft and Google were part of TC-39 at the time, and were the main opponents of ES4. While they had some rightful reasons to take this position, there's no way ES4 hasn't shaped TS in the end. Perhaps the lack of mention of any of this is due to that TypeScript might have been handed to Anders' team after the project vision and original design have developed (in the video, it is introduced as a continuation of "SharpScript"), but the interview still left me rather insatiated.

Out of the big 4 involved in typescript, only one was involved with the tc39