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+express-minify
+==============
+[![Build Status](https://travis-ci.org/SummerWish/express-minify.svg?branch=master)](https://travis-ci.org/SummerWish/express-minify) [![npm version](https://img.shields.io/npm/v/express-minify.svg)](https://www.npmjs.com/package/express-minify) [![npm download counter](https://img.shields.io/npm/dm/express-minify.svg)](https://www.npmjs.com/package/express-minify)
+
+[![Dependency Status](https://david-dm.org/SummerWish/express-minify.svg)](https://david-dm.org/SummerWish/express-minify) [![devDependency Status](https://david-dm.org/SummerWish/express-minify/dev-status.svg)](https://david-dm.org/SummerWish/express-minify#info=devDependencies)
+
+[![NodeICO](https://nodei.co/npm/express-minify.png?downloads=true&downloadRank=true&stars=true)](https://www.npmjs.com/package/express-minify)
+
+Automatically minify and cache your javascript and css files.
+
+It also supports [LESS/SASS/Stylus/CoffeeScript compiling and minifying](#parse-and-minify-coffeescriptlesssassstylus).
+
+# Installation
+
+```
+npm install express-minify
+```
+
+# Basic Usage
+
+```javascript
+var minify = require('express-minify');
+app.use(minify());
+```
+
+## Default Options
+
+```javascript
+app.use(minify({
+  js_match: /javascript/,
+  css_match: /css/,
+  sass_match: /scss/,
+  less_match: /less/,
+  stylus_match: /stylus/,
+  coffee_match: /coffeescript/,
+  json_match: /json/,
+  uglifyJS: undefined,
+  cssmin: undefined,
+  cache: false,
+  onerror: undefined,
+}));
+```
+
+- `js_match`: `RegExp`
+  
+  matches JavaScript content-type.
+
+- `css_match`: `RegExp`
+  
+  matches css content-type.
+
+- `sass_match`: `RegExp`
+  
+  matches SASS content-type.
+
+- `less_match`: `RegExp`
+  
+  matches LESS content-type.
+
+- `stylus_match`: `RegExp`
+  
+  matches STYLUS content-type.
+
+- `coffee_match`: `RegExp`
+  
+  matches CoffeeScript content-type.
+
+- `json_match`: `RegExp`
+  
+  matches JSON content-type.
+
+- `uglifyJS`: `Object`
+  
+  customize UglifyJS instance (`require('uglify-js')`).
+  
+- `cssmin`: `Object`
+
+  customize cssmin instance (`require('cssmin')`).
+
+- `cache`: `String | false`
+  
+  the directory for cache storage (must be writeable). Pass `false` to cache in the memory (not recommended).
+
+- `onerror`: `Function`
+
+  handle compiling error or minifying errors. You can determine what to respond when facing such errors. See [Customize onError behavior](#customize-onrrror-behavior) for details.
+
+## Per-Response Options
+
+- `res._skip`
+
+  Pass `true` to disable all kind of processing (minifying & precompiling).
+
+- `res._no_minify`
+
+  Pass `true` to disable minifying.
+
+- `res._no_cache`
+
+  Pass `true` to disable caching response data.
+
+### UglifyJs Options
+
+- `res._uglifyMangle`
+
+  Pass `false` to disable mangling names when minifying JavaScript for this response.
+
+- `res._uglifyOutput`
+
+  Pass an object if you wish to specify additional UglifyJs [output options](http://lisperator.net/uglifyjs/codegen) when minifying JavaScript for this response.
+
+- `res._uglifyCompress`
+
+  Pass an object to specify custom UglifyJs [compressor options](http://lisperator.net/uglifyjs/compress) (pass `false` to skip) when minifying JavaScript for this response.
+
+# Examples
+
+## Working with express-static:
+
+```javascript
+app.use(minify());
+app.use(express.static(__dirname + '/static'));
+```
+
+## Working with express-compression (gzip):
+
+```javascript
+app.use(compression());
+app.use(minify());
+```
+
+## Minify dynamic responses:
+
+```javascript
+var responseJS = 
+    "(function(window, undefined)\n" +
+    "{\n" +
+    "\n" +
+    "    var hello = 'hello';\n" +
+    "\n" +
+    "    var world = 'world';\n" +
+    "\n" +
+    "    alert(hello + world);\n" +
+    "\n" +
+    "})(window);"
+
+app.use(minify());
+app.get('/response.js', function(req, res)
+{
+    res.setHeader('Content-Type', 'application/javascript');
+    res.end(responseJS);
+});
+```
+
+## Use file cache to improve performance:
+
+You can use a file cache instead of the default memory cache to reduce memory usage.
+
+You need to specify a writable directory to store those cache file.
+
+```javascript
+app.use(minify({cache: __dirname + '/cache'}));
+app.use(express.static(__dirname + '/static'));
+```
+
+## Parse and minify CoffeeScript/LESS/SASS/Stylus:
+
+`express-minify` can automatically compile your files and minify it without the need of specifying a source file directory. Currently it supports coffee-script, less, sass and stylus.
+
+To enable this feature, first of all you need to install those modules by yourself:
+
+```
+# you needn't install all of those modules
+# only choose what you want
+npm install coffee-script less node-sass stylus --save
+```
+
+Then you need to define MIME for those files:
+
+```javascript
+// Test URL: http://localhost/auto_parsed_compressed.coffee
+
+express.static.mime.define(
+{
+    'text/coffeescript':  ['coffee'],
+    'text/less':          ['less'],
+    'text/x-scss':        ['scss'],
+    'text/stylus':        ['styl']
+});
+
+app.use(minify());
+```
+
+**Notice**: Those modules are listed in `devDependencies` for testing purpose. If you don't manually add them to your project's `dependencies`, you may face errors when switching from npm dev install to npm production install because they are no longer installed by express-minify.
+
+**Change since 0.1.6**: You need to manually install those modules to enable this feature.
+
+## Customize onError behavior
+
+Errors thrown by CoffeeScript/LESS/SASS/Stylus module are compiling errors and errors thrown by UglifyJS/cssmin/JSON module are minifying errors.
+
+The default behavior is to return the error message for compiling errors and return the original content for minifying errors.
+
+You can change this behavior or get notified about the error by providing `onerror` in options:
+
+```javascript
+var minify = require('express-minify');
+
+/*
+
+err: the Error object
+stage: "compile" or "minify"
+assetType: The type of the source code, can be one of
+  minify.Minifier.TYPE_TEXT
+  minify.Minifier.TYPE_JS
+  minify.Minifier.TYPE_CSS
+  minify.Minifier.TYPE_SASS
+  minify.Minifier.TYPE_LESS
+  minify.Minifier.TYPE_STYLUS
+  minify.Minifier.TYPE_COFFEE
+  minify.Minifier.TYPE_JSON
+minifyOptions: Minification options
+body: Source code (string)
+callback: (err, body) return the final result as string in this callback function.
+  If `err` is null, the final result will be cached.
+
+*/
+
+var myErrorHandler = function (err, stage, assetType, minifyOptions, body, callback) {
+  console.log(err);
+  // below is the default implementation
+  if (stage === 'compile') {
+    callback(err, JSON.stringify(err));
+    return;
+  }
+  callback(err, body);
+};
+
+app.use(minify({
+  onerror: myErrorHandler
+}));
+```
+
+You can also access the default implementation from `minify.Minifier.defaultErrorHandler`.
+
+## Customize UglifyJS/cssmin instance
+
+If you want to use your own UglifyJS/cssmin instance (for example, use a different branch to support ES6), you can pass them to the options.
+
+```javascript
+var myUglifyJS = require('uglify-js');
+var myCssmin = require('cssmin');
+app.use(minify({
+  uglifyJS: myUglifyJS,
+  cssmin: myCssmin,
+}));
+```
+
+Notice: You may need to clear file cache after switching to your own UglifyJS/cssmin instance because cache may be outdated.
+
+## Specify UglifyJs options
+
+`response._uglifyMangle`: pass false to skip mangling names.
+
+Example: Disable mangle for AngularJs.
+
+```javascript
+app.use(function(req, res, next)
+{
+    // do not mangle -angular.js files
+    if (/-angular\.js$/.test(req.url)) {
+        res._uglifyMangle = true;
+    }
+    next();
+});
+app.use(minify());
+```
+
+`response._uglifyOutput`: specify UglifyJs additional [output options](http://lisperator.net/uglifyjs/codegen).
+
+Example: Preserve comments for specific files.
+
+```javascript
+app.use(function(req, res, next)
+{
+    if (/\.(user|meta)\.js$/.test(req.url)) {
+        res._uglifyOutput = {
+            comments: true
+        };
+    }
+    next();
+});
+```
+
+`response._uglifyCompress`: specify UglifyJs custom [compressor options](http://lisperator.net/uglifyjs/compress).
+
+## Disable minifying or caching for a response
+
+If you don't want to minify a specific response, just use `response._no_minify = true`.
+
+If you want to minify a response but don't want to cache it (for example, dynamic response data), use: `response._no_cache = true`.
+
+Example:
+
+```javascript
+app.use(function(req, res, next)
+{
+    // for all *.min.css or *.min.js, do not minify it
+    if (/\.min\.(css|js)$/.test(req.url)) {
+        res._no_minify = true;
+    }
+    next();
+});
+app.use(minify());
+```
+
+Yet another example:
+
+```javascript
+app.use(minify());
+app.get('/server_time_min.jsonp', function(req, res)
+{
+    var obj = {
+        'ok': true,
+        'data': {
+            'timestamp': new Date().getTime()
+        }
+    };
+
+    // minify this response, but do not cache it
+    res._no_cache = true;
+    res.setHeader('Content-Type', 'application/javascript');
+    res.send("callback(" + JSON.stringify(obj, null, 4) + ");");
+});
+app.get('/server_time.jsonp', function(req, res)
+{
+    var obj = {
+        'ok': true,
+        'data': {
+            'timestamp': new Date().getTime()
+        }
+    };
+
+    // do not minify this response
+    res._no_minify = true;
+    res.setHeader('Content-Type', 'application/javascript');
+    res.send("callback(" + JSON.stringify(obj, null, 4) + ");");
+});
+```
+
+**WARNING**: Do NOT set `_no_minify` between `res.write` and `res.end`.
+
+# Notice
+
+If you are using `cluster`, it is strongly recommended to enable file cache. They can share file caches.
+
+# Change log
+
+0.2.0
+
+- Support `onerror`
+- Minimum required NodeJs version changed to `0.12.0` for `fs.access`.
+
+0.1.7
+
+- Support customizing UglifyJS/cssmin instance
+
+0.1.6
+
+- Make `node-sass`, `stylus`, `less`, `coffee-script` dependency optional, now developers need to manually install those modules to enable compiling
+
+0.1.5
+
+- Fix MIME for Js
+- Fix JSON minify performance issue
+
+0.1.4
+
+- Add some useful badges [#27](https://github.com/SummerWish/express-minify/pull/27)
+- Update dependencies
+- Support JSON minify [#25](https://github.com/SummerWish/express-minify/pull/25)
+- Start to use travis-ci online build testing
+
+0.1.3
+
+- Update dependencies [#19](https://github.com/breeswish/express-minify/issues/19) [#20](https://github.com/breeswish/express-minify/issues/20)
+
+0.1.2
+
+- Added `res._skip`.
+- Modified behaviour of `res._no_minify`. Now it will only disable minifying and won't cause precompiling not working. [#17](https://github.com/breeswish/express-minify/issues/17)
+- Fixed cache bugs with response options.
+
+0.1.1
+
+- Added fallback for `res._no_mangle = true` (Please use `res._uglifyMangle = false`)
+- Update dependencies
+
+0.1.0
+
+- Changed disabling mangle: `res._no_mangle = true` => `res._uglifyMangle = false`
+- Added support for passing additional UglifyJs options: `res._uglifyCompress`, `res._uglifyOutput` [#15](https://github.com/breeswish/express-minify/issues/15)
+
+0.0.11
+
+- Update dependencies [#11](https://github.com/breeswish/express-minify/issues/11)
+
+0.0.10
+
+- Added tests
+
+- Fixed SASS compiling
+
+- Fixed express-compression compatibility
+
+0.0.9
+
+- Added support for `res._no_mangle` [#10](https://github.com/breeswish/express-minify/pull/10)
+
+0.0.8
+
+- Removed options of `whitelist` and `blacklist`
+
+- Added support for `res._no_cache` [#5](https://github.com/breeswish/express-minify/issues/5)
+
+- Node v0.10 compatible
+
+0.0.7
+
+- Changed `options`'s default `blacklist` to `[/\.min\.(css|js)$/]`
+
+- Replaced `uglifycss` with `cssmin`
+
+- Dropped support for `.sass` (https://github.com/andrew/node-sass/issues/12)
+
+- Fixed [#3](https://github.com/breeswish/express-minify/issues/3)
+
+0.0.6
+
+- Support for blacklist and whitelist [#2](https://github.com/breeswish/express-minify/issues/2)
+
+0.0.5
+
+- Added support for `res._no_minify`
+
+- Fixed [#1](https://github.com/breeswish/express-minify/issues/1)
+
+0.0.4
+
+- Support for LESS/SASS/Stylus/CoffeeScript parsing and minifying
+
+0.0.3
+
+- Support for file cache
+
+- Fixed the bug of non-string path
+
+0.0.2
+
+- Support for dynamic minifying
+
+# License
+
+The MIT License (MIT)
+
+Copyright (c) 2016 Breezewish
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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