Nodejs module systems (thombergs#151)

* add code examples for nodejs modules

* add new cases for es modules

* add README

Author: RobYed

nodejs/modules/.gitignore

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+node_modules

nodejs/modules/.prettierrc.json

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+{}

nodejs/modules/README.md

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+# Examples for [How to Use Modules in Your NodeJS Application?](nodejs-module-systems)
+
+This repository contains the source code of the article's examples. They cover the basics on how to use the module 
+systems CommonJS and ES Modules in NodeJS.

nodejs/modules/package-lock.json

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+{
+  "name": "nodejs-modules",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "format": "prettier --write ."
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/thombergs/code-examples.git"
+  },
+  "author": "Robert Dey",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/thombergs/code-examples/issues"
+  },
+  "homepage": "https://reflectoring.io/",
+  "dependencies": {
+    "chalk": "^4.1.2"
+  },
+  "devDependencies": {
+    "prettier": "2.5.1"
+  }
+}

nodejs/modules/package.json

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+const Logger = require("./logger");
+
+Logger.info(`${logger.defaultMessage} printed in blue`);
+Logger.error("some error message printed in red");

nodejs/modules/src/commonjs/class-export/index.js

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+const chalk = require("chalk");
+
+class Logger {
+  static defaultMessage = "Hello World";
+
+  static info(message) {
+    console.log(chalk.blue(message));
+  }
+
+  static error(message) {
+    console.log(chalk.red(message));
+  }
+}
+
+module.exports = Logger;

nodejs/modules/src/commonjs/class-export/logger.js

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+const http = require("http");
+
+const server = http.createServer(function (_req, res) {
+  res.writeHead(200);
+  res.end("Hello, World!");
+});
+server.listen(8080);

nodejs/modules/src/commonjs/core-modules/index.js

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+const chalk = require("chalk"); // don't forget to install
+
+console.log(chalk.blue("Hello world printed in blue"));

nodejs/modules/src/commonjs/node-modules/index.js

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+const logger = require("./logger");
+
+logger.logInfo(`${logger.defaultMessage} printed in blue`);
+logger.logError("some error message printed in red");