Source mapping is a technique that "maps" your browser inspector's line numbers to the source file. Source maps can also be used with minified assets that would normally have their line numbers removed.
If you're curious, here's some more information regarding source maps. Source-mapping is enabled by default in IE 11 with the Windows 8. No other versions of IE support source-mapping.
Is there any information on Edge supporting source maps for CSS.
Skip to content. Instantly share code, notes, and snippets. Code Revisions 2 Stars 13 Forks 5. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. How to enable source maps for your browser. How to enable source maps Source mapping is a technique that "maps" your browser inspector's line numbers to the source file.
Chrome Open Developer Tools. Click the Settings cog icon in the upper-right corner of the Developer Tools hiwatch onvif. Under the Sources section, check the box es for the source maps you want to enable. Firefox Open the Developer Tools. Under the Style Editor section, check the box for Show original sources. Safari Source-mapping is enabled by default. This comment has been minimized. Sign in to view.
Copy link Quote reply. Sign up for free to join this conversation on GitHub.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account. Hello everyone, I just started to use webpack and I'm having serious issues in debugging my code.
The problem is that the Chrome debugger doesn't work properly. I'm not sure if this is a webpack issue, a Chrome issue or my fault. I've tried to search both Chrome and Webpack related issues, changing browser or anything else it comes in my mind without success.
I'm having this issue too. The interesting thing is that it only happens in Windows. In OS X and Linux the source maps line up correctly. I have this issue on OSX. Seeing the same problems as bolismauro in chrome. Tested on Chrome48 OSX I'm also having major problems with eval sourcemaps in Chrome 49 on OS X.
Sourcemaps appear to work fine in Firefox I'm using babel 6. Out of interest, I've seen stack traces on other projects include line numbers from source maps rather than app. Is this something on the source-map side, or a browser add-in? Haven't tested all of these options, but running into some of the same issues right now on Windows. Will do further testing with other options as I get time.
I've created a gist. In my broken-source-maps repo, I believe that I've isolated webpack as the sourcemap problem I have done few more testing.
When I try to minify by running web pack with -p or using the uglify plugin, I can not set break points at certain line. Its seems there is a mismatch between indexs. My guess: as a result of code modification and HMR, the JS running in browser changed, but in meanwhile, chrome doesn't update the sourcemap, so real code and sourcemap are not in-sync anymore, which results in breakpoints' malfunction.
But what happens when you need to debug the code within those compressed files? It can be a nightmare. Fear not however, there is a solution on the horizon and it goes by the name of source maps. This means that — with the help of a bit of software — you can easily debug your applications even after your assets have been optimized. The Chrome and Firefox developer tools both ship with built-in support for source maps. You may need to enable support manually in Chrome.
To do this, launch the Chrome dev tools and open the Settings pane cog in the bottom right corner. You can specify a different source map for each of your compressed files. You indicate to the browser that a source map is available by adding a special comment to the bottom of your optimised file.
There are also a number of other utilities available that have support for generating source maps. A selection of these are listed below.
Don't really know what can go wrong on the web? You don't have to. Chrome automatically protects you from security issues like phishing and dangerous sites. Chrome works on any operating system, and on all your devices. Switch between your laptop and phone, customise any way that you want, and keep doing more. There may be a community-supported version for your distribution here. Note: Installing Google Chrome will add the Google repository so your system will automatically keep Google Chrome up to date.
Map Preprocessed Code to Source Code
Download Chrome today Download Chrome. Accept and Install. Learn more Arrow. Ok, Got it.Below are the steps that I took to achieve this. That might be all you have available at the moment.
You might want to restart Chrome at this point. Now the browser is set up and ready to use source maps you will need to make some small changes to your CSS compilation. Or you can add the following to your config. After compiling your styles again using the debug info flag you should be abe to refresh your project in the browser and see the correct style to sass file mapping.
Hopefully the above helped you get source maps up and running. Remember to take the debug info flag out of your compilation settings before moving to production mode, else be the butt of many jokes. As always if any of the steps above are incorrect or something gets updated then please let me know how it could be changed and updated. Danny Croft is an open source developer that loves working with new technologies.
Here he documents his thoughts and shares items of interest. You will probably have to restart the browser again. Step 5 Now the browser is set up and ready to use source maps you will need to make some small changes to your CSS compilation.
Compass compass compile --debug-info compass watch --debug-info Or you can add the following to your config. Closing notes Hopefully the above helped you get source maps up and running. Leave a comment .Source maps in Chrome. When your source code has gone through transformations, debugging becomes a problem.
The advantage of doing this is that you avoid all the problems related to source maps while gaining better performance. If you are using webpack 4 and the new mode option, the tool will generate source maps automatically for you in development mode. Production usage requires attention, though. Webpack can generate both inline or separate source map files.
The inline ones are valuable during development due to better performance while the separate ones are handy for production use as it keeps the bundle size small. In this case, loading source maps is optional. It's possible you don't want to generate a source map for your production bundle as this makes it effortless to inspect your application.
By disabling source maps, you are performing a sort of obfuscation. Whether or not you want to enable source maps for production, they are handy for staging. Skipping source maps speeds up your build as generating source maps at the best quality can be a complicated operation.
Hidden source maps give stack trace information only. You can connect them with a monitoring service to get traces as the application crashes allowing you to fix the problematic situations. While this isn't ideal, it's better to know about possible problems than not.
Webpack provides two ways to enable source maps. There's a devtool shortcut field. You can also find two plugins that give more options to tweak. The plugins are going to be discussed briefly at the end of this chapter.
Beyond webpack, you also have to enable support for source maps at the browsers you are using for development.In just a few clicks, you can download Chrome and easily search for YouTube videos from the address bar. For Mac OS X Big or small, work or play — Chrome has the smarts and speed you need to do, create, and explore online. Don't really know what can go wrong on the web?
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You can adjust your privacy controls anytime in your Google settings. Menu Menu. See more Arrow. Get more done with the new Chrome In just a few clicks, you can download Chrome and easily search for YouTube videos from the address bar. Set Google Chrome as my default browser.
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Download Chrome today Download Chrome. Please select your download package: 64 bit. Accept and Install. Looking for Chrome for a different operating system? Learn more Arrow. Ok, Got it.