less: generate map files when building style.css with 'npm run less' The map files allow web development tools ("Firebug" style) to show the .less and .css source instead of the generated style.css . The generated style.css will get a trailing comment with a reference to kallithea/public/css/style.css.map . It will not have any impact on runtime.

{
  "name": "kallithea",
  "private": true,
  "dependencies": {
    "bootstrap": "3.3.7"
  },
  "devDependencies": {
    "less": "~2.7",
    "less-plugin-clean-css": "~1.5"
  },
  "scripts": {
    "less": "lessc --relative-urls --source-map --source-map-less-inline kallithea/public/less/main.less kallithea/public/css/style.css"
  }
}