Bad map file for jQuery 1.9.1 in the jQuery CDN

Jquery Blog - Fri, 08/31/2018 - 01:15

Quite a while back, Mike Taylor pointed out that the jQuery CDN has a minified copy of jQuery 1.9.1 with an incorrect map file reference. Basically, it refers to the map for jQuery 1.11.1, and that’s just wrong. If you are trying to debug a site that uses the minified jQuery 1.9.1 file, dev tools will get very confused and make a hard job even harder.

You might think that we could just edit the file to point to the correct map file, which does exist as There are at least two problems with doing that. The first is that the file is heavily cached across the internet, since it’s been assumed for years that it will never change once the release occurs. Even if we edited the file, both the JavaScript and map file might never actually update at the point where they’re being used.

A second problem is even more serious. We’ve been advocating that developers use the script’s integrity attribute to ensure that the file you are including has not been modified since you originally wrote the script tag. If we modify the contents of the file this attribute will be wrong and the page will no longer include the file. This is likely to completely break the page! Given the age of jQuery 1.9.1 it is possible that many of the pages including this file are not being actively maintained. Thus, we can’t seriously consider changing the JavaScript file in any way, not even one byte.

The least disruptive option is to remove the file that the jQuery 1.9.1 minified file references. It does not affect whether jQuery runs correctly for the visitors of a site. It only has the effect of disabling the source map. Because of these pitfalls of including the sourceMappingURL map reference in CDN JavaScript files that are often copied elsewhere, we no longer include it.

If you need to debug a site using one of these minified files, it is possible to manually associate a map file in Chrome. Open the minified source file, right click over the area of the minified source, and select “Add source map…”.

The incorrect file has been removed from the jQuery CDN. We expect that there won’t be any observable change from removing this file, other than restoring sanity to debugging a site that uses jQuery 1.9.1. The jQuery 1.11.1 minified file does not reference its map, so it will continue to work fine and you can associate a map file as mentioned above.

Because caches are so aggressive on CDNs and across the internet, it’s possible that you may still see this map file for a while. If you see some unusual behavior that you think is related to the missing file you can open a ticket on the CDN issue tracker.

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