My take as an outsider: Google has absolutely no interest in this, especially with their recent cost-cutting measures. Google cares about things that make the "web" better for the end users so that they can sell more ads, not developer tools. TypeScript or JavaScript doesn't matter that much to Google, and actually Google probably doesn't want to see TypeScript files distributed over network (which doesn't make much sense in the first place). In all honesty, Microsoft understands development experience much better than Google and most other companies. They literally own Visual Studio, Visual Studio Code and GitHub and sell products/services for money.