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If two versions of colors exist on disk then this will always throw. This is extremely common in development scenarios with npm link but also if two packages depended on by a third both depend on colors but the parent does not.

  parent-app
  `--- pkg-a
  |   `---colors
  `--- pkg-b
     `---colors
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require('colors');
require('winston');
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mkdir colors-explodes
cd colors-explodes
 
#
# 1. Copy the package.json and colors-explodes.js
# in this gist
#
$ npm install
colors@0.6.0 ./node_modules/colors
 
#
# 2. Make a local copy of winston and link it
#
$ mkdir local
$ cd local
$ git clone https://github.com/flatiron/winston.git
$ cd winston
$ npm link
$ cd ../../
$ npm link winston
$ ./node_modules/winston -> /.local/lib/node_modules/winston -> /colors-explode/local/winston
 
#
# 3. Run colors-explodes.js and watch it explode
#
$ node colors-explodes.js
 
node.js:134
throw e; // process.nextTick error, or 'error' event on first tick
^
Error: underline already exists on String.prototype, cannot override.
at /colors-explode/local/winston/node_modules/colors/colors.js:50:11
at /colors-explode/local/winston/node_modules/colors/colors.js:68:3
at Array.forEach (native)
at Object.<anonymous> (/colors-explode/local/winston/node_modules/colors/colors.js:63:3)
at Module._compile (module.js:411:26)
at Object..js (module.js:417:10)
at Module.load (module.js:343:31)
at Function._load (module.js:302:12)
at require (module.js:355:19)
at Object.<anonymous> (/colors-explode/local/winston/lib/winston/config.js:9:14)
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{
"name" : "colors-explodes",
"version" : "0.0.0",
"description" : "color@0.6.0 + `npm link` === explode",
"bin": {
"explode": "./colors-explodes.js"
},
"dependencies" : {
"colors" : "*"
},
"license" : "MIT",
"engine" : {
"node" : ">=0.4"
}
}
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