This example is so neat that could not resist mentioning it here (as a compliment to whoever did that). First, a screenshot of the VSCode view:
followed by the Chrome/Bravo view:
The highly celebrated VSCode (I agree with that assessment) was not able to detect this issue, because it is not a compiler (however it does use Linter). Amongst all RWJS great features, I wanted to point out the tremendous attention to details, colors - it almost makes me look forward to the future typos I will make.