A quick test using Charles Web Proxy shows that source maps are only loaded if developer tools are opened. If you load a page without dev tools opened, there is no http request for source maps. The behaviour was the same in Chrome 43 and Firefox 38. So it appears they would be no impact … Read more
For source mapping here is the way I go about it: In my bundle command for my production build I tell it to generate a source map: iOS: react-native bundle –platform ios –entry-file index.ios.js –dev false –bundle-output ./ios/main.jsbundle –assets-dest ./ios –sourcemap-output ./sourcemap.js Android – I had to actually modify the android/app/react.gradle file to get source … Read more
Open Developer Tools, go to “Settings” for Developer Tools, then uncheck Enable JavaScript Sourcemaps under the “Sources” settings.
From Working with CSS preprocessors in Chrome DevTools: Many developers generate CSS style sheets using a CSS preprocessor, such as Sass, Less, or Stylus. Because the CSS files are generated, editing the CSS files directly is not as helpful. For preprocessors that support CSS source maps, DevTools lets you live-edit your preprocessor source files in … Read more
In order to use source map, you should change devtool option value from true to the value which available in this list, for instance source-map devtool: ‘source-map’ devtool: ‘source-map’ – A SourceMap is emitted.
The .map files are for JavaScript and CSS (and now TypeScript too) files that have been minified. They are called source maps. When you minify a file, like the angular.js file, it takes thousands of lines of pretty code and turns it into only a few lines of ugly code. Hopefully, when you are shipping … Read more