I'm not sure if it's what you mean, but the optional chaining [1] feature added to Javascript (and hence browsers) was championed among others by the TypeScript

I'm not sure if it's what you mean, but the optional chaining [1] feature added to Javascript (and hence browsers) was championed among others by the TypeScript team. [1] https://github.com/tc39/proposal-optional-chaining https://github.com/tc39/proposal-optional-chaining