kamleshchandnani

<script> async, defer, async defer, module, nomodule, src, inline - the cheat sheet

With the addition of ES modules, there's now no fewer than 24 ways to load your JS code: (inline|not inline) x (defer|no defer) x (async|no async) x (type=text/javascript | type=module | nomodule) -- and each of them is subtly different.

This document is a comparison of various ways the <script> tags in HTML are processed depending on the attributes set.

If you ever wondered when to use inline <script async type="module"> and when <script nomodule defer src="...">, you're in the good place!

Note that this article is about <script>s inserted in the HTML; the behavior of <script>s inserted at runtime is slightly different - see Deep dive into the murky waters of script loading by Jake Archibald (2013)

kamleshchandnani

UPDATE: A better way! (August 2015)

As pointed out by @johntyree in the comments, using git reflog is easier and more reliable. Thanks for the suggestion!

 $ git reflog
1ed7510 HEAD@{1}: checkout: moving from develop to 1ed7510
3970d09 HEAD@{2}: checkout: moving from b-fix-build to develop
1ed7510 HEAD@{3}: commit: got everything working the way I want
70b3696 HEAD@{4}: commit: upgrade rails, do some refactoring

kamleshchandnani

const AWS = require('aws-sdk');
const Busboy = require('busboy');

const BUCKET_NAME = '';
const IAM_USER_KEY = '';
const IAM_USER_SECRET = '';

function uploadToS3(file) {
  let s3bucket = new AWS.S3({
    accessKeyId: IAM_USER_KEY,

kamleshchandnani

No, .mjs is not a Python 3-like split

Seen a few tweets on this. I want to dispel some FUD.

Node is probably going to introduce a new file extension for JavaScript modules, .mjs. The reasons for this are long and perilous, and trying to summarize the discussion that led to it is maddening. The short version is that ES6 modules have different semantics from existing scripts, and need to be executed differently. In browsers, this is done with <script type="module">. In Node, this will be done by analyzing the file extension of the imported file.

I'll be honest: I don't love this solution! I was rooting for the TC39 counter-proposal. But I also understand the solution that the Node developers chose, and why they chose it.

The new file extension is a good enough solution. You can read the [draft spec](https://github.com/nodejs/node-eps/

kamleshchandnani

import babel from 'rollup-plugin-babel'
import commonjs from 'rollup-plugin-commonjs'
import postcss from 'rollup-plugin-postcss'
import resolve from 'rollup-plugin-node-resolve'

import pkg from './package.json'

export default {
  input: 'src/index.js',
  output: [