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3a515b92
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cagy
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# debug
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[](https://travis-ci.org/visionmedia/debug) [](https://coveralls.io/github/visionmedia/debug?branch=master) [](https://visionmedia-community-slackin.now.sh/) [](#backers)
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[](#sponsors)
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A tiny node.js debugging utility modelled after node core's debugging technique.
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**Discussion around the V3 API is under way [here](https://github.com/visionmedia/debug/issues/370)**
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## Installation
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```bash
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$ npm install debug
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```
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## Usage
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`debug` exposes a function; simply pass this function the name of your module, and it will return a decorated version of `console.error` for you to pass debug statements to. This will allow you to toggle the debug output for different parts of your module as well as the module as a whole.
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Example _app.js_:
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```js
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var debug = require('debug')('http')
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, http = require('http')
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, name = 'My App';
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// fake app
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debug('booting %s', name);
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http.createServer(function(req, res){
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debug(req.method + ' ' + req.url);
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res.end('hello\n');
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}).listen(3000, function(){
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debug('listening');
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});
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// fake worker of some kind
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require('./worker');
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```
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Example _worker.js_:
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```js
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var debug = require('debug')('worker');
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setInterval(function(){
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debug('doing some work');
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}, 1000);
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```
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The __DEBUG__ environment variable is then used to enable these based on space or comma-delimited names. Here are some examples:
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#### Windows note
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On Windows the environment variable is set using the `set` command.
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```cmd
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set DEBUG=*,-not_this
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```
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Note that PowerShell uses different syntax to set environment variables.
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```cmd
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$env:DEBUG = "*,-not_this"
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```
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Then, run the program to be debugged as usual.
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## Millisecond diff
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When actively developing an application it can be useful to see when the time spent between one `debug()` call and the next. Suppose for example you invoke `debug()` before requesting a resource, and after as well, the "+NNNms" will show you how much time was spent between calls.
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When stdout is not a TTY, `Date#toUTCString()` is used, making it more useful for logging the debug information as shown below:
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## Conventions
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If you're using this in one or more of your libraries, you _should_ use the name of your library so that developers may toggle debugging as desired without guessing names. If you have more than one debuggers you _should_ prefix them with your library name and use ":" to separate features. For example "bodyParser" from Connect would then be "connect:bodyParser".
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## Wildcards
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The `*` character may be used as a wildcard. Suppose for example your library has debuggers named "connect:bodyParser", "connect:compress", "connect:session", instead of listing all three with `DEBUG=connect:bodyParser,connect:compress,connect:session`, you may simply do `DEBUG=connect:*`, or to run everything using this module simply use `DEBUG=*`.
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You can also exclude specific debuggers by prefixing them with a "-" character. For example, `DEBUG=*,-connect:*` would include all debuggers except those starting with "connect:".
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## Environment Variables
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When running through Node.js, you can set a few environment variables that will
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change the behavior of the debug logging:
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| Name | Purpose |
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|-----------|-------------------------------------------------|
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| `DEBUG` | Enables/disables specific debugging namespaces. |
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| `DEBUG_COLORS`| Whether or not to use colors in the debug output. |
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| `DEBUG_DEPTH` | Object inspection depth. |
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| `DEBUG_SHOW_HIDDEN` | Shows hidden properties on inspected objects. |
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__Note:__ The environment variables beginning with `DEBUG_` end up being
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converted into an Options object that gets used with `%o`/`%O` formatters.
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See the Node.js documentation for
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[`util.inspect()`](https://nodejs.org/api/util.html#util_util_inspect_object_options)
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for the complete list.
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## Formatters
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Debug uses [printf-style](https://wikipedia.org/wiki/Printf_format_string) formatting. Below are the officially supported formatters:
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| Formatter | Representation |
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|-----------|----------------|
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| `%O` | Pretty-print an Object on multiple lines. |
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| `%o` | Pretty-print an Object all on a single line. |
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| `%s` | String. |
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| `%d` | Number (both integer and float). |
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| `%j` | JSON. Replaced with the string '[Circular]' if the argument contains circular references. |
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| `%%` | Single percent sign ('%'). This does not consume an argument. |
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### Custom formatters
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You can add custom formatters by extending the `debug.formatters` object. For example, if you wanted to add support for rendering a Buffer as hex with `%h`, you could do something like:
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```js
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const createDebug = require('debug')
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createDebug.formatters.h = (v) => {
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return v.toString('hex')
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}
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// …elsewhere
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const debug = createDebug('foo')
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debug('this is hex: %h', new Buffer('hello world'))
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// foo this is hex: 68656c6c6f20776f726c6421 +0ms
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```
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## Browser support
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You can build a browser-ready script using [browserify](https://github.com/substack/node-browserify),
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or just use the [browserify-as-a-service](https://wzrd.in/) [build](https://wzrd.in/standalone/debug@latest),
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if you don't want to build it yourself.
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Debug's enable state is currently persisted by `localStorage`.
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Consider the situation shown below where you have `worker:a` and `worker:b`,
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and wish to debug both. You can enable this using `localStorage.debug`:
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```js
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localStorage.debug = 'worker:*'
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```
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And then refresh the page.
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```js
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a = debug('worker:a');
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b = debug('worker:b');
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setInterval(function(){
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a('doing some work');
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}, 1000);
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setInterval(function(){
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b('doing some work');
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}, 1200);
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```
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#### Web Inspector Colors
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Colors are also enabled on "Web Inspectors" that understand the `%c` formatting
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option. These are WebKit web inspectors, Firefox ([since version
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31](https://hacks.mozilla.org/2014/05/editable-box-model-multiple-selection-sublime-text-keys-much-more-firefox-developer-tools-episode-31/))
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and the Firebug plugin for Firefox (any version).
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Colored output looks something like:
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## Output streams
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By default `debug` will log to stderr, however this can be configured per-namespace by overriding the `log` method:
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Example _stdout.js_:
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```js
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var debug = require('debug');
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var error = debug('app:error');
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// by default stderr is used
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error('goes to stderr!');
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var log = debug('app:log');
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// set this namespace to log via console.log
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log.log = console.log.bind(console); // don't forget to bind to console!
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log('goes to stdout');
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error('still goes to stderr!');
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// set all output to go via console.info
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// overrides all per-namespace log settings
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debug.log = console.info.bind(console);
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error('now goes to stdout via console.info');
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log('still goes to stdout, but via console.info now');
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```
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## Authors
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- TJ Holowaychuk
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- Nathan Rajlich
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- Andrew Rhyne
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## Backers
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Support us with a monthly donation and help us continue our activities. [[Become a backer](https://opencollective.com/debug#backer)]
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<a href="https://opencollective.com/debug/backer/0/website" target="_blank"><img src="https://opencollective.com/debug/backer/0/avatar.svg"></a>
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<a href="https://opencollective.com/debug/backer/1/website" target="_blank"><img src="https://opencollective.com/debug/backer/1/avatar.svg"></a>
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## Sponsors
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Become a sponsor and get your logo on our README on Github with a link to your site. [[Become a sponsor](https://opencollective.com/debug#sponsor)]
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<a href="https://opencollective.com/debug/sponsor/15/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/15/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/16/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/16/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/17/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/17/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/18/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/18/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/19/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/19/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/20/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/20/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/21/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/21/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/22/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/22/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/23/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/23/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/24/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/24/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/25/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/25/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/26/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/26/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/27/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/27/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/28/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/28/avatar.svg"></a>
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<a href="https://opencollective.com/debug/sponsor/29/website" target="_blank"><img src="https://opencollective.com/debug/sponsor/29/avatar.svg"></a>
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## License
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(The MIT License)
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Copyright (c) 2014-2016 TJ Holowaychuk <tj@vision-media.ca>
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Permission is hereby granted, free of charge, to any person obtaining
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a copy of this software and associated documentation files (the
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'Software'), to deal in the Software without restriction, including
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without limitation the rights to use, copy, modify, merge, publish,
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distribute, sublicense, and/or sell copies of the Software, and to
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| 300 |
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permit persons to whom the Software is furnished to do so, subject to
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the following conditions:
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| 303 |
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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| 309 |
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IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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| 310 |
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CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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| 311 |
|
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TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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| 312 |
|
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SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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