Control Add-ins Supercharged: Debugging with source maps

So far I’ve shown how to configure gulp to help you with some basic JavaScript development tasks, such as bundling and minifying, and how to automate builds on every source file change. Let’s now take it to an entirely new level: debugging.

If you ever tried to debug your control add-in source code using Visual Studio Code, you might have realized two things: first, that it’s actually pretty simple to do; and second, that it’s not the kind of debugging that you want.

Let’s see why that is.

First, using VS Code with a browser such as Chrome, Edge (especially “Canary”, mmmm) or Firefox is easy. There are debugging extensions built for that purpose that allow you to either launch a browser with VS Code attached as a debugger, or to attach VS Code to a running instance of a browser (some browser configuration needed beforehand). However, when you use VS Code as a debugger like this, it’s hardly more than a glorified browser built-in developer tool – the only benefit of using VS Code is that, well, you are in VS Code, rather than inside the browser. However, you are not really debugging your source files – you are debugging scripts currently loaded in the browser. You can’t set debug breakpoints in your source files – you can only set them in copies of files that are loaded by the browser. If you catch a bug (kind of a point with a debugger) you can’t stop the process and immediately change the line where the bug is, but you have to first locate the matching source script, and then the offending line, and then fix it there. Not exactly a fun pastime.

And that’s annoying enough if you have a single script to work with, but if you have several scripts, bundled together, then minified, well, good luck with that. Debugging minified code is as close as you can get to inquisition-level torture in this century.

So, let’s fix this mess, and let’s enable debugging as it should be – let’s enable debugging of actual source files with full breakpoint integration and all.

That’s what my next branch is about. In it, I introduce source maps and how you can use gulp to build them. And then I explain how you can configure your VS Code to debug your source files.

So, head over to and check out some pretty cool stuff.

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