If the code is running in the browser: source maps are the answer (there's a step-debugger in the browser's devtools panel). But also: Modern Javascript is (mor

If the code is running in the browser: source maps are the answer (there's a step-debugger in the browser's devtools panel). But also: Modern Javascript is (more or less) just Typescript with the type hints removed, so even debugging the output JS code is pretty straightforward.