Chrome source map

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.

chrome source map

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.

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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.

It's the size! Once the source maps get too large chrome is choking. There certainly seems to be a problem with Chrome See Chrome Bug My bug report was recently updated to WontFix saying "This is a known issue with webpack; we can't do much" because "Webpack changes the content of the sourcemaps resources". It would seem that Chrome has indicated that the fault is solely with Webpack, but I feel that a solution would not be that difficult esp.Matt West writes on December 12, One of the easiest performance wins you can gain for your website is to combine and compress your JavaScript and CSS files.

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.

This comment will usually be added by the program that was used to generate the source map. The developer tools will only load this file if support for source maps is enabled and the developer tools are open. Here is a simple example:. UglifyJS is a popular command line utility that allows you to combine and compress JavaScript files. Version 2 supports a number of command line flags that help with generating source maps. Note : If you use the grunt-contrib-uglify plugin for Grunt, refer to the documentation for information on how to specify these options in your Gruntfile.

There are also a number of other utilities available that have support for generating source maps. A selection of these are listed below.

If you have your source maps set up correctly, you should see each of the original JavaScript files listed in the file pane of the Sources tab. The dev tools is loading the source map file for you and then fetching each of the original source files. Try a Demo. Firefox users can see the individual source files in the Debugger tab of the developer tools. Again the dev tools has identified that a source map is available and has then fetched each of the referenced source files.

Should you wish to view the compressed versions instead, click the cog icon in the top right corner of the tab and deselect Show original sources. Using source maps allows developers to maintain a straight-forward debugging environment while at the same time optimizing their sites for performance. In this post you have learned how source maps work and seen how you can generate them using UglifyJS. File should name the minified javascript file, not the sourcemap one.For Mac OS X Big or small, work or play — Chrome has the smarts and speed that you need to do, create and explore online.

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

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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.

chrome source map

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.

When debugging in a browser, how to tell where the original code is? Source maps solve this problem by providing a mapping between the original and the transformed source code. In addition to source compiling to JavaScript, this works for styling as well. One approach is to skip source maps during development and rely on browser support of language features. If you use ES without any extensions and develop using a modern browser, this can work.

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.

chrome source map

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?

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, customize any way 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. The device you have runs on Chrome OS, which already has Chrome browser built-in. Learn more about automatic updates. See the full list of supported operating systems. Google uses cookies to deliver its services, to personalize ads, and to analyze traffic.

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chrome source map

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.