paper.js/node.js/index.js

var fs = require('fs'),
	vm = require('vm'),
	path = require('path'),
	// Have HTMLCanvasElement reference Canvas too, so we do not handle browser
	// and server differently in some places of our code.
	Canvas = HTMLCanvasElement =require('canvas');

__dirname = path.resolve(__dirname, '../src/');

// Create the context within which we will run the source files:
var context = vm.createContext({
	options: {
		server: true,
		version: 'dev'
	},
	fs: fs,
	// Node Canvas library: https://github.com/learnboost/node-canvas
	Canvas: Canvas,
	Image: Canvas.Image,
	// Copy over global variables:
    console: console,
	require: require,
	__dirname: __dirname,
	__filename: __filename,
	// Used to load and run source files within the same context:
	include: function(uri) {
		var source = fs.readFileSync(path.resolve(__dirname, uri), 'utf8');
		// For relative includes, we save the current directory and then
		// add the uri directory to __dirname:
		var oldDirname = __dirname;
		__dirname = path.resolve(__dirname, path.dirname(uri));
		vm.runInContext(source, context, uri);
		__dirname = oldDirname;
	}
});

// Load Paper.js library files:
context.include('paper.js');

context.Base.each(context, function(val, key) {
	if (val && val.prototype instanceof context.Base) {
		val._name = key;
		// Export all classes through PaperScope:
		context.PaperScope.prototype[key] = val;
	}
});
context.PaperScope.prototype['Canvas'] = context.Canvas;

require.extensions['.pjs'] = function(module, uri) {
	var source = context.PaperScript.compile(fs.readFileSync(uri, 'utf8'));
	var envVars = 'var __dirname = \'' + path.dirname(uri) + '\';' + 
				 'var __filename = \'' + uri + '\';';
	vm.runInContext(envVars, context);
	var scope = new context.PaperScope();
	context.PaperScript.evaluate(source, scope);
	module.exports = scope;
};

module.exports = new context.PaperScope();