Frank Fang FrankFang

Pure ESM package

The package that linked you here is now pure ESM. It cannot be require()'d from CommonJS.

This means you have the following choices:

Use ESM yourself. (preferred)
Use import foo from 'foo' instead of const foo = require('foo') to import the package. You also need to put "type": "module" in your package.json and more. Follow the below guide.
If the package is used in an async context, you could use await import(…) from CommonJS instead of require(…).
Stay on the existing version of the package until you can move to ESM.

async/await is just the do-notation of the Promise monad

CertSimple just wrote a blog post arguing ES2017's async/await was the best thing to happen with JavaScript. I wholeheartedly agree.

In short, one of the (few?) good things about JavaScript used to be how well it handled asynchronous requests. This was mostly thanks to its Scheme-inherited implementation of functions and closures. That, though, was also one of its worst faults, because it led to the "callback hell", an seemingly unavoidable pattern that made highly asynchronous JS code almost unreadable. Many solutions attempted to solve that, but most failed. Promises almost did it, but failed too. Finally, async/await is here and, combined with Promises, it solves the problem for good. On this post, I'll explain why that is the case and trace a link between promises, async/await, the do-notation and monads.

First, let's illustrate the 3 styles by implementing

	FROM ruby:2.3.1

	# Install dependencies
	RUN apt-get update -qq && apt-get install -y build-essential libpq-dev nodejs

	# Set an environment variable where the Rails app is installed to inside of Docker image:
	ENV RAILS_ROOT /var/www/app_name
	RUN mkdir -p $RAILS_ROOT

	# Set working directory, where the commands will be ran:

	package main

	import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

	<!DOCTYPE html>
	<html>
	<head>
	<%= inline_js 'application.js' %>
	<%= inline_css 'application.css' %>
	</head>
	<body>
	</body>
	</html>

	npm set registry https://r.npm.taobao.org # 注册模块镜像
	npm set disturl https://npm.taobao.org/dist # node-gyp 编译依赖的 node 源码镜像

	## 以下选择添加
	npm set sass_binary_site https://npm.taobao.org/mirrors/node-sass # node-sass 二进制包镜像
	npm set electron_mirror https://npm.taobao.org/mirrors/electron/ # electron 二进制包镜像
	npm set ELECTRON_MIRROR https://cdn.npm.taobao.org/dist/electron/ # electron 二进制包镜像
	npm set puppeteer_download_host https://npm.taobao.org/mirrors # puppeteer 二进制包镜像
	npm set chromedriver_cdnurl https://npm.taobao.org/mirrors/chromedriver # chromedriver 二进制包镜像
	npm set operadriver_cdnurl https://npm.taobao.org/mirrors/operadriver # operadriver 二进制包镜像

	// Central xhr progress tracker. Used for both a global
	// activity indicator as well as granular spinners within in a page.
	var Progress$ = new Rx.Subject();

	// Make an xhr call and make a tag to track the progress ticks.
	var users$ = Rx.DOM.ajax({
	method: 'GET',
	url: 'https://api.github.com/users',
	responseType: 'json',
	progressObserver: Rx.Observer.create(

	// Today, I noticed that someone favorited this tweet of mine from 2012:
	// https://twitter.com/cowboy/status/232587756486938624
	// !function $(){console.log('!'+$+'()')}() #quine

	// So I fooled around for a little bit:

	// Shortest JavaScript quine?
	(function _(){return'('+_+')()'})()

	// Have fun with this one!

	AllCops:
	RunRailsCops: true

	# Commonly used screens these days easily fit more than 80 characters.
	Metrics/LineLength:
	Max: 120

	# Too short methods lead to extraction of single-use methods, which can make
	# the code easier to read (by naming things), but can also clutter the class
	Metrics/MethodLength:

	0.0.0.0
	1.1.80.147
	1.1.127.45
	1.33.190.70
	1.33.191.58
	1.209.208.200
	1.234.1.235
	1.234.2.155
	1.234.4.97
	1.234.17.34