[NPM] Create a node script to replace a complex npm script

In this lesson we will look at pulling out complex npm script logic into an external JavaScript file. Instead of writing bash scripts you can leverage your JavaScript abilities to automate your build process. We’ll use some helper node modules such as shelljs, opn-cli, and babel-cli.

Install:

npm i -D shelljs babel-cli

From:

"test": "BABEL_ENV=test mocha spec/ --require babel-register",

To:

1. create a "scripts/test.js" file.

2. Add content:

import { exec } from "shelljs";

const isWindows = process.platform === "win32";
const environment = isWindows ?
    "set BABEL_ENV=test&&" :
    "BABEL_ENV=test";

exec( `${ environment } mocha spec/ --require babel-register` );

3. Change package.json

"test": "babel-node ./scripts/test.js",

---

From:

    "build": "npm-run-all build:*",
    "prebuild": "rm -rf public/$npm_package_version",
    "build:html": "pug --obj data.json src/index.pug --out public/$npm_package_version/",
    "build:css": "node-sass src/index.scss | postcss -c .postcssrc.json | cssmin > public/$npm_package_version/index.min.css",
    "build:js": "mustache data.json src/index.mustache.js | uglifyjs > public/$npm_package_version/index.min.js",

To:

1. create "scripts/build.js".

2. Add content:

import { rm, exec } from "shelljs";

const version = process.env.npm_package_version;

rm( "-rf", `public/${ version }` );
exec( `pug --obj data.json src/index.pug --out public/${ version }/` );
exec( `node-sass src/index.scss | postcss -c .postcssrc.json | cssmin > public/${ version }/index.min.css` );
exec( `mustache data.json src/index.mustache.js | uglifyjs > public/${ version }/index.min.js` );

3. Change package.json:

"build": "babel-node ./scripts/build.js",

---

From:

    "server": "npm-run-all --parallel server:*",
    "server:create": "http-server public/$npm_package_version -p $npm_package_config_port",
    "server:launch": "open http://localhost:$npm_package_config_port",

To:

1. Create "scripts/server.js".

2. Add content:

import { exec } from "shelljs";

const {
    npm_package_version: version,
    npm_package_config_port: port
} = process.env;

exec( `http-server public/${ version } -p ${ port }`, { async: true } );
exec( `opn http://localhost:${ port }` );

3. Change package.json file:

"server": "babel-node ./scripts/server.js",

Be careful that in Windows single quote doesn't work, we need to replace single quote to 

"