Modules

• AirBNB JavaScript Style Guide: Modules

  • 10.1 Always use modules (import/export) over a non-standard module system.

  • 10.2 Do not use wildcard imports.

  • 10.6 In modules with a single export, prefer default export over named export.

    • Interpretation: multiple exports allowed

• Confusing as hell

  • ESM vs CommonJS vs ES6

If using export default use import var from module:

export const foo = 42
export default 21;

If you want the 21, use import bar from './input';

import barImport from './input';
console.log(barImport); // 21

const barRequire = require('./input');
console.log(barRequire);
/*
{
    foo: 42,
    default: 21,
}
*/

Notes

export const types = () => {}

is different from

export function types() { }

• https://nodejs.org/api/modules.html

• http://2ality.com/2014/09/es6-modules-final.html

• https://stackoverflow.com/questions/40294870/module-exports-vs-export-default-in-node-js-and-es6

Clearing Confusing

			Goals
CommonJs	module.exports = ...	var module = require('module')
AMD		define(['dependency1'], function(dependency1	Load synchronously	Asynchronous Module Definition
UMD				Universal Module Definition
ESM

• https://medium.freecodecamp.org/javascript-modules-a-beginner-s-guide-783f7d7a5fcc