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The "commonjs_modules" page has been changed by mikeal.
http://wiki.apache.org/couchdb/commonjs_modules

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New page:
As of the 0.11 release of CouchDB you can use CommonJS 1.0 modules in your 
show, list, update, and validation functions. map and reduce functions '''can 
NOT''' use modules.

{{{#!highlight JavaScript
  {
   _id:"_design/test", 
   language: "javascript",
   whatever : {
     stringzone : "exports.string = 'plankton';",
     commonjs : {
       whynot : "exports.test = require('../stringzone')",
       upper : "exports.testing = require('./whynot').test.string.toUpperCase()"
     }
   },
   shows: {
     simple: "function() {return 'ok'};",
     requirey : "function() { var lib = require('whatever/commonjs/upper'); 
return lib.testing; };"
   }
  }
}}}

Within a show function you can require CommonJS modules that are defined within 
object in your design document. The id you pass to require() is a / delimited 
list of property names to resolve the module string within the design document.


All imports are relative to the design document root unless they start with ./ 
or ../, these are referred to as "relative require" statements. Relative 
require statements only work within CommonJS modules they cannot be used 
directly inside your show, list, update and validation functions.

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