Jo Liss joliss

Deep dependencies (npm style) are great when (1) you are relatively memory/bandwidth unconstrained, and (2) your programming style is purely functional. (1) is pretty obvious, so I want to elaborate on (2):

With an object-oriented programming style, you are often passing around instances of your class.

var widget = new Widget
widget.groupWith(otherWidget)

You clearly don't want widget to interact with slightly different versions of itself through otherWidget. (Trying to do so would require that we are extremely disciplined with what the Widget::groupWith method calls on otherWidget.) Asking for this to work is, in my opinion, a fundamentally bad idea from an architectural point of view. Ideally, it should not be possible for two versions of the Widget class to exist in the same app. Bundler on Ruby enforces this, and it's awesome.

Why it's hard to map ES6 modules 1:1 into CommonJS or AMD

Originally from an email, gisted here for posterity:

I was able to remember the example where "naive" 1:1 module transpilation fails:

http://www.solitr.com/blog/2015/03/openssl-vulnerability-breakdown/

	#!/bin/bash

	# Replace all installed versions of a package under node_modules with symlinks

	# Usage:
	# npm-link-all rsvp
	# npm-link-all async node-async # different directory name

	for i in `find node_modules -name "$1" -type d -or -name "$1" -type l `;
	do

	#!/usr/bin/env node

	var fs = require('fs')
	var path = require('path')

	function resolveSymlink (symlink) {
	// Naive but broken:
	return path.resolve(path.dirname(symlink), fs.readlinkSync(symlink))

	// This would be correct:

	salmondesign-hush $ gdb --args node `which broccoli` serve
	GNU gdb (Ubuntu 7.7-0ubuntu3.1) 7.7
	Copyright (C) 2014 Free Software Foundation, Inc.
	License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
	This is free software: you are free to change and redistribute it.
	There is NO WARRANTY, to the extent permitted by law. Type "show copying"
	and "show warranty" for details.
	This GDB was configured as "x86_64-linux-gnu".
	Type "show configuration" for configuration details.
	For bug reporting instructions, please see:

	$ while sleep 2; do touch app/index.html; done &
	$ ember serve

	...

	...

	Build successful - 129ms.

	Slowest Trees \| Total

	var fs = require('fs')

	fs.mkdirSync('physical-dir')
	fs.symlinkSync('physical-dir', 'symlinked-dir')
	process.chdir('symlinked-dir')
	console.log(process.cwd())
	process.chdir('..')
	fs.unlinkSync('symlinked-dir')
	fs.rmdirSync('physical-dir')

	New python executable in default_env/bin/python
	Installing setuptools, pip...done.
	Downloading/unpacking git+https://github.com/scipy/scipy
	Cloning https://github.com/scipy/scipy to /tmp/pip-ulCB5M-build
	Running setup.py (path:/tmp/pip-ulCB5M-build/setup.py) egg_info for package from git+https://github.com/scipy/scipy
	Running from numpy source directory.
	/tmp/easy_install-5mmVDt/numpy-1.8.1/numpy/distutils/system_info.py:1521: UserWarning:
	Atlas (http://math-atlas.sourceforge.net/) libraries not found.
	Directories to search for the libraries can be specified in the
	numpy/distutils/site.cfg file (section [atlas]) or by setting

	version: 0.1.1
	Livereload server on port 35729
	Serving on http://0.0.0.0:4200

	Build successful - 271ms.

	Slowest Trees \| Total
	-------------------------------+----------------
	Concat \| 70ms
	JSHint - App \| 36ms