feat: Split and add to JS modules

Author: MichaelCurrin

cheatsheets/javascript/node/modules.md

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+# CommonJS
+
+The newer ES Modules syntax is preferred over this style.
+
+Use `module.exports` to export and `require` to import a module.
+
+
+## Import installed package
+
+```javascript
+const request = require('request');
+```
+
+
+## Local modules
+
+### Name exports
+
+Create a variable or function or class, then at the end of the script typically you export it.
+
+- `foo.js`
+    ```javascript
+    function foo() {
+    console.log("Hello");
+    }
+
+    exports.foo = 'foo';
+    // Or
+    module.exports.foo = 'foo';
+    // Result:
+    // { foo: 'foo'}
+    ```
+
+Select objects in the module.
+
+```javascript
+const { bar } = require('./foo')
+// Or, less common.
+const bar = require('./foo').bar;
+```
+
+### Default exports
+
+- `foo.js`
+    ```javascript
+    function foo() {
+    console.log("Hello");
+    }
+
+    module.exports = 'foo';
+    ```
+
+Import the default object from module with any name you want.
+
+```javascript
+const foo = require('./foo');
+```

cheatsheets/javascript/node/modules/common-js.md

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+# ES modules
+
+As of ES6 (ES2015), JavaScript `supports` a native module format. It uses the `export` and `import` keywords.
+
+
+## Import installed package
+
+Depending on the structure of the module.
+
+```javascript
+import * as foo from 'foo';
+```
+Or
+```javascript
+import { foo } from 'foo';
+```
+
+
+## Local modules
+
+Note you must set this up otherwise you'll get an error.
+
+- `package.json`
+    ```json
+    {
+    "type": "module"
+    }
+    ```
+
+### Named exports
+
+- `foo.js`
+    ```javascript
+    function foo() {
+      console.log("Hello");
+    }
+
+    export { foo };
+    ```
+- `foo.js` alternative.
+    ```javascript
+    export function foo() {
+      console.log("Hello");
+    }
+    ```
+
+```javascript
+import { foo } from './foo';
+```
+
+### Default exports
+
+- `foo.js`
+    ```javascript
+    function foo() {
+      console.log("Hello");
+    }
+
+    export default foo;
+    ```
+
+```javascript
+import foo from './foo';
+```

cheatsheets/javascript/node/modules/es-modules.md

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+---
+layout: listing
+description: How to export and import modules in Node
+---
+# Modules
+
+
+- [Modules](https://nodejs.org/api/modules.html) in the Node docs
+- [Different module formats](https://www.sitepoint.com/understanding-module-exports-exports-node-js/)