Browserify optional dependency

browserify-optional.md

The problem: make require not to throw error when a package is not in installed.

A. browserify-optional

B. Dynamic require:

var react
try {
  var a = 'react'
  react = require(a) // Cannot find module 'react'
}
catch (e) {}

Once react is included by user, that automatically resolves:

// in userland
require('react')

// in package land
var a = 'react'
require(a) // ok