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TL;DR, from quickly browsing through it:

He mostly regrets the way Promises work (edit: that the async programming APIs don't work with them), security/sandboxing, and the module system.

Then he introduces "Deno", a successor which is under construction and which will fix all these problems. It exposes a language based on TypeScript. Internally, some parts of Deno are written in GoLang.



He regrets not including promises early on.




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