How to Debug JavaScript on Older Browsers

You need types and I kind of hate that when you have to go install the types yourself So a lot of packages just ship them by default. Source maps are really just a map from the The code to the compiled code so that way when you debug the debugger can know where the issue is in the actual source code. Next up is polyfills. If you want your JavaScript to work on Older browsers older versions of node Often they will ship what's called core JS.