Using NPM as task runner

package.json

{
  "name": "npm.task.runner",
  "version": "0.0.1",
  "description": "npm task runner",
  "main": "index.html",
  "author": "",
  "license": "ISC",
  "scripts": {
    "clean": "rimraf dist/{css/*,js/*,img/*}",
    "autoprefixer": "postcss -u autoprefixer -r dist/css/*",
    "copy:css": "mkdirp dist/css -p && cp -r src/css dist","comment:copy:css": "todo: cssmin",
    "copy:vendor": "mkdirp dist/vendor -p && cp -r src/vendor dist","comment:copy:vendor": "todo: copy min assets , optimise",
    "copy:vendor-js": "mkdirp dist/js/plugins -p && cp -r src/js/plugins dist/js","comment:copy:vendor-js": "todo: optimise",
    "copy:all": "npm run copy:css && npm run copy:vendor && npm run copy:vendor-js",
    "scss": "node-sass --output-style compressed -o dist/css src/scss",
    "htmlprocess": "htmlprocessor src/index.html -o dist/index.html","comment:htmlprocess": "todo: use more of this",
    "lint": "eslint src/js || true",
    "lint-scss": "stylelint src/scss/*.scss --syntax scss || true",
    "uglify": "mkdirp dist/js -p && uglifyjs src/js/*.js -m -o dist/js/app.js && uglifyjs src/js/*.js -m -c -o dist/js/app.min.js || true",
    "imagemin": "imagemin src/img/* -o dist/img",
    "icons": "svgo -f src/img/icons -o dist/img/icons && svg-sprite-generate -d dist/img/icons -o dist/img/icons/sprite.svg",
    "serve": "browser-sync start --server \"dist\" --files \"dist\"",
    "build:html": "npm run htmlprocess",
    "build:scss": "npm run lint-scss && npm run scss && npm run autoprefixer",
    "build:css": "npm run copy:css",
    "build:js": "npm run lint && npm run uglify",
    "build:images": "npm run imagemin && npm run icons",
    "build:vendor": "npm run copy:vendor",
    "build:all": "npm run build:vendor && npm run build:css && npm run build:js && npm run build:images && npm run build:html",
    "test": "jshint . --exclude node_modules",
    "watch:css": "onchange \"src/scss\" -- npm run build:css",
    "watch:html": "onchange \"src/**/*.html\" -- npm run build:html",
    "watch:js": "onchange \"src/js\" -- npm run build:js",
    "watch:images": "onchange \"src/img\" -- npm run build:images",
    "watch:all": "npm-run-all -p serve watch:css watch:js watch:images",
    "postinstall": "npm run build:all && npm run watch:all",
    "prebuild": "echo I run before the build script",
    "build": "npm run build:all",
    "postbuild": "echo I run after the build script",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "devDependencies": {
    "autoprefixer": "latest",
    "browser-sync": "latest",
    "cssmin": "latest",
    "eslint": "latest",
    "eslint-config-standard": "latest",
    "eslint-plugin-promise": "latest",
    "eslint-plugin-standard": "latest",
    "htmlprocessor": "latest",
    "imagemin-cli": "latest",
    "jshint": "latest",
    "mkdirp": "latest",
    "node-sass": "latest",
    "npm-run-all": "latest",
    "onchange": "latest",
    "postcss-cli": "latest",
    "rimraf": "latest",
    "stylelint": "latest",
    "svg-sprite-generator": "latest",
    "svgo": "latest",
    "uglify-js": "latest"
  }
}