Enable Sass sourcemap in Ionic 2/3

By default, Ionic only enable sourcemap for .ts file and disable for .sass (https://github.com/driftyco/ionic-app-scripts/blob/master/config/sass.config.js#L16). So, if you want to enable and debug your stylesheets file, just follow 2 steps: Create config/sass.config.js module.exports = { sourceMap: true, } Update package.json “config”: { “ionic_sass”: “./config/sass.config.js”, }, And just re-run ionic serve command.