When using the Chrome Inspector for JavaScript debugging, variables may appear as undefined in watches and the console, but they can still be inspected by

When I'm debugging AngularJS in Chrome inspector, I often encounter a frustrating situation. I know that certain variables are defined because I can hover my mouse over them in Chrome inspector and see them in the 'locals' tab. However, when I attempt to add them to the watch tab or evaluate them in the console by typing their names, they show up as "undefined". Take a look at the picture (notice the variable 'xhr').

Can someone please clarify why variables sometimes appear as undefined in the watch tab and console, even though they are not actually undefined in the current scope? And, if possible, provide guidance on how to ensure that the watch window and console consistently display the correct values of these variables? See picture (notice the variable 'xhr'). https://i.sstatic.net/LeAn9.png Thanks!

Answer №1

Debugger does not display resolved names for source mapped variables yet, as this feature is still pending implementation. It is worth noting that the map file includes an array of names with the original names, although current browsers do not utilize this information effectively. There was a previous experimental feature in Canary browser, but it seems to have been removed.

If you are interested, you can track updates on how to view source map variable names in Developer Tools.

For now, I suggest using the un-minified version of the library to debug your specific issues, while switching back to the minified version for production. It may not be perfect, but it can help in troubleshooting.

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