loose-envify.js
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loose-envify.js
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			'use strict';

			var stream = require('stream');
			var util = require('util');
			var replace = require('./replace');

			var jsonExtRe = /\.json$/;

			module.exports = function(rootEnv) {
			rootEnv = rootEnv \|\| process.env;
			return function (file, trOpts) {
			if (jsonExtRe.test(file)) {
			return stream.PassThrough();
			}
			var envs = trOpts ? [rootEnv, trOpts] : [rootEnv];
			return new LooseEnvify(envs);
			};
			};

			function LooseEnvify(envs) {
			stream.Transform.call(this);
			this._data = '';
			this._envs = envs;
			}
			util.inherits(LooseEnvify, stream.Transform);

			LooseEnvify.prototype._transform = function(buf, enc, cb) {
			this._data += buf;
			cb();
			};

			LooseEnvify.prototype._flush = function(cb) {
			var replaced = replace(this._data, this._envs);
			this.push(replaced);
			cb();
			};