twitst4tz

twitter statistics web application
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README.md (21551B)


      1 # debug
      2 [![Build Status](https://travis-ci.org/visionmedia/debug.svg?branch=master)](https://travis-ci.org/visionmedia/debug)  [![Coverage Status](https://coveralls.io/repos/github/visionmedia/debug/badge.svg?branch=master)](https://coveralls.io/github/visionmedia/debug?branch=master)  [![Slack](https://visionmedia-community-slackin.now.sh/badge.svg)](https://visionmedia-community-slackin.now.sh/) [![OpenCollective](https://opencollective.com/debug/backers/badge.svg)](#backers)
      3 [![OpenCollective](https://opencollective.com/debug/sponsors/badge.svg)](#sponsors)
      4 
      5 <img width="647" src="https://user-images.githubusercontent.com/71256/29091486-fa38524c-7c37-11e7-895f-e7ec8e1039b6.png">
      6 
      7 A tiny JavaScript debugging utility modelled after Node.js core's debugging
      8 technique. Works in Node.js and web browsers.
      9 
     10 ## Installation
     11 
     12 ```bash
     13 $ npm install debug
     14 ```
     15 
     16 ## Usage
     17 
     18 `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.
     19 
     20 Example [_app.js_](./examples/node/app.js):
     21 
     22 ```js
     23 var debug = require('debug')('http')
     24   , http = require('http')
     25   , name = 'My App';
     26 
     27 // fake app
     28 
     29 debug('booting %o', name);
     30 
     31 http.createServer(function(req, res){
     32   debug(req.method + ' ' + req.url);
     33   res.end('hello\n');
     34 }).listen(3000, function(){
     35   debug('listening');
     36 });
     37 
     38 // fake worker of some kind
     39 
     40 require('./worker');
     41 ```
     42 
     43 Example [_worker.js_](./examples/node/worker.js):
     44 
     45 ```js
     46 var a = require('debug')('worker:a')
     47   , b = require('debug')('worker:b');
     48 
     49 function work() {
     50   a('doing lots of uninteresting work');
     51   setTimeout(work, Math.random() * 1000);
     52 }
     53 
     54 work();
     55 
     56 function workb() {
     57   b('doing some work');
     58   setTimeout(workb, Math.random() * 2000);
     59 }
     60 
     61 workb();
     62 ```
     63 
     64 The `DEBUG` environment variable is then used to enable these based on space or
     65 comma-delimited names.
     66 
     67 Here are some examples:
     68 
     69 <img width="647" alt="screen shot 2017-08-08 at 12 53 04 pm" src="https://user-images.githubusercontent.com/71256/29091703-a6302cdc-7c38-11e7-8304-7c0b3bc600cd.png">
     70 <img width="647" alt="screen shot 2017-08-08 at 12 53 38 pm" src="https://user-images.githubusercontent.com/71256/29091700-a62a6888-7c38-11e7-800b-db911291ca2b.png">
     71 <img width="647" alt="screen shot 2017-08-08 at 12 53 25 pm" src="https://user-images.githubusercontent.com/71256/29091701-a62ea114-7c38-11e7-826a-2692bedca740.png">
     72 
     73 #### Windows command prompt notes
     74 
     75 ##### CMD
     76 
     77 On Windows the environment variable is set using the `set` command.
     78 
     79 ```cmd
     80 set DEBUG=*,-not_this
     81 ```
     82 
     83 Example:
     84 
     85 ```cmd
     86 set DEBUG=* & node app.js
     87 ```
     88 
     89 ##### PowerShell (VS Code default)
     90 
     91 PowerShell uses different syntax to set environment variables.
     92 
     93 ```cmd
     94 $env:DEBUG = "*,-not_this"
     95 ```
     96 
     97 Example:
     98 
     99 ```cmd
    100 $env:DEBUG='app';node app.js
    101 ```
    102 
    103 Then, run the program to be debugged as usual.
    104 
    105 npm script example:
    106 ```js
    107   "windowsDebug": "@powershell -Command $env:DEBUG='*';node app.js",
    108 ```
    109 
    110 ## Namespace Colors
    111 
    112 Every debug instance has a color generated for it based on its namespace name.
    113 This helps when visually parsing the debug output to identify which debug instance
    114 a debug line belongs to.
    115 
    116 #### Node.js
    117 
    118 In Node.js, colors are enabled when stderr is a TTY. You also _should_ install
    119 the [`supports-color`](https://npmjs.org/supports-color) module alongside debug,
    120 otherwise debug will only use a small handful of basic colors.
    121 
    122 <img width="521" src="https://user-images.githubusercontent.com/71256/29092181-47f6a9e6-7c3a-11e7-9a14-1928d8a711cd.png">
    123 
    124 #### Web Browser
    125 
    126 Colors are also enabled on "Web Inspectors" that understand the `%c` formatting
    127 option. These are WebKit web inspectors, Firefox ([since version
    128 31](https://hacks.mozilla.org/2014/05/editable-box-model-multiple-selection-sublime-text-keys-much-more-firefox-developer-tools-episode-31/))
    129 and the Firebug plugin for Firefox (any version).
    130 
    131 <img width="524" src="https://user-images.githubusercontent.com/71256/29092033-b65f9f2e-7c39-11e7-8e32-f6f0d8e865c1.png">
    132 
    133 
    134 ## Millisecond diff
    135 
    136 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.
    137 
    138 <img width="647" src="https://user-images.githubusercontent.com/71256/29091486-fa38524c-7c37-11e7-895f-e7ec8e1039b6.png">
    139 
    140 When stdout is not a TTY, `Date#toISOString()` is used, making it more useful for logging the debug information as shown below:
    141 
    142 <img width="647" src="https://user-images.githubusercontent.com/71256/29091956-6bd78372-7c39-11e7-8c55-c948396d6edd.png">
    143 
    144 
    145 ## Conventions
    146 
    147 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".  If you append a "*" to the end of your name, it will always be enabled regardless of the setting of the DEBUG environment variable.  You can then use it for normal output as well as debug output.
    148 
    149 ## Wildcards
    150 
    151 The `*` character may be used as a wildcard. Suppose for example your library has
    152 debuggers named "connect:bodyParser", "connect:compress", "connect:session",
    153 instead of listing all three with
    154 `DEBUG=connect:bodyParser,connect:compress,connect:session`, you may simply do
    155 `DEBUG=connect:*`, or to run everything using this module simply use `DEBUG=*`.
    156 
    157 You can also exclude specific debuggers by prefixing them with a "-" character.
    158 For example, `DEBUG=*,-connect:*` would include all debuggers except those
    159 starting with "connect:".
    160 
    161 ## Environment Variables
    162 
    163 When running through Node.js, you can set a few environment variables that will
    164 change the behavior of the debug logging:
    165 
    166 | Name      | Purpose                                         |
    167 |-----------|-------------------------------------------------|
    168 | `DEBUG`   | Enables/disables specific debugging namespaces. |
    169 | `DEBUG_HIDE_DATE` | Hide date from debug output (non-TTY).  |
    170 | `DEBUG_COLORS`| Whether or not to use colors in the debug output. |
    171 | `DEBUG_DEPTH` | Object inspection depth.                    |
    172 | `DEBUG_SHOW_HIDDEN` | Shows hidden properties on inspected objects. |
    173 
    174 
    175 __Note:__ The environment variables beginning with `DEBUG_` end up being
    176 converted into an Options object that gets used with `%o`/`%O` formatters.
    177 See the Node.js documentation for
    178 [`util.inspect()`](https://nodejs.org/api/util.html#util_util_inspect_object_options)
    179 for the complete list.
    180 
    181 ## Formatters
    182 
    183 Debug uses [printf-style](https://wikipedia.org/wiki/Printf_format_string) formatting.
    184 Below are the officially supported formatters:
    185 
    186 | Formatter | Representation |
    187 |-----------|----------------|
    188 | `%O`      | Pretty-print an Object on multiple lines. |
    189 | `%o`      | Pretty-print an Object all on a single line. |
    190 | `%s`      | String. |
    191 | `%d`      | Number (both integer and float). |
    192 | `%j`      | JSON. Replaced with the string '[Circular]' if the argument contains circular references. |
    193 | `%%`      | Single percent sign ('%'). This does not consume an argument. |
    194 
    195 
    196 ### Custom formatters
    197 
    198 You can add custom formatters by extending the `debug.formatters` object.
    199 For example, if you wanted to add support for rendering a Buffer as hex with
    200 `%h`, you could do something like:
    201 
    202 ```js
    203 const createDebug = require('debug')
    204 createDebug.formatters.h = (v) => {
    205   return v.toString('hex')
    206 }
    207 
    208 // …elsewhere
    209 const debug = createDebug('foo')
    210 debug('this is hex: %h', new Buffer('hello world'))
    211 //   foo this is hex: 68656c6c6f20776f726c6421 +0ms
    212 ```
    213 
    214 
    215 ## Browser Support
    216 
    217 You can build a browser-ready script using [browserify](https://github.com/substack/node-browserify),
    218 or just use the [browserify-as-a-service](https://wzrd.in/) [build](https://wzrd.in/standalone/debug@latest),
    219 if you don't want to build it yourself.
    220 
    221 Debug's enable state is currently persisted by `localStorage`.
    222 Consider the situation shown below where you have `worker:a` and `worker:b`,
    223 and wish to debug both. You can enable this using `localStorage.debug`:
    224 
    225 ```js
    226 localStorage.debug = 'worker:*'
    227 ```
    228 
    229 And then refresh the page.
    230 
    231 ```js
    232 a = debug('worker:a');
    233 b = debug('worker:b');
    234 
    235 setInterval(function(){
    236   a('doing some work');
    237 }, 1000);
    238 
    239 setInterval(function(){
    240   b('doing some work');
    241 }, 1200);
    242 ```
    243 
    244 
    245 ## Output streams
    246 
    247   By default `debug` will log to stderr, however this can be configured per-namespace by overriding the `log` method:
    248 
    249 Example [_stdout.js_](./examples/node/stdout.js):
    250 
    251 ```js
    252 var debug = require('debug');
    253 var error = debug('app:error');
    254 
    255 // by default stderr is used
    256 error('goes to stderr!');
    257 
    258 var log = debug('app:log');
    259 // set this namespace to log via console.log
    260 log.log = console.log.bind(console); // don't forget to bind to console!
    261 log('goes to stdout');
    262 error('still goes to stderr!');
    263 
    264 // set all output to go via console.info
    265 // overrides all per-namespace log settings
    266 debug.log = console.info.bind(console);
    267 error('now goes to stdout via console.info');
    268 log('still goes to stdout, but via console.info now');
    269 ```
    270 
    271 ## Extend
    272 You can simply extend debugger 
    273 ```js
    274 const log = require('debug')('auth');
    275 
    276 //creates new debug instance with extended namespace
    277 const logSign = log.extend('sign');
    278 const logLogin = log.extend('login');
    279 
    280 log('hello'); // auth hello
    281 logSign('hello'); //auth:sign hello
    282 logLogin('hello'); //auth:login hello
    283 ```
    284 
    285 ## Set dynamically
    286 
    287 You can also enable debug dynamically by calling the `enable()` method :
    288 
    289 ```js
    290 let debug = require('debug');
    291 
    292 console.log(1, debug.enabled('test'));
    293 
    294 debug.enable('test');
    295 console.log(2, debug.enabled('test'));
    296 
    297 debug.disable();
    298 console.log(3, debug.enabled('test'));
    299 
    300 ```
    301 
    302 print :   
    303 ```
    304 1 false
    305 2 true
    306 3 false
    307 ```
    308 
    309 Usage :  
    310 `enable(namespaces)`  
    311 `namespaces` can include modes separated by a colon and wildcards.
    312    
    313 Note that calling `enable()` completely overrides previously set DEBUG variable : 
    314 
    315 ```
    316 $ DEBUG=foo node -e 'var dbg = require("debug"); dbg.enable("bar"); console.log(dbg.enabled("foo"))'
    317 => false
    318 ```
    319 
    320 `disable()`
    321 
    322 Will disable all namespaces. The functions returns the namespaces currently
    323 enabled (and skipped). This can be useful if you want to disable debugging
    324 temporarily without knowing what was enabled to begin with.
    325 
    326 For example:
    327 
    328 ```js
    329 let debug = require('debug');
    330 debug.enable('foo:*,-foo:bar');
    331 let namespaces = debug.disable();
    332 debug.enable(namespaces);
    333 ```
    334 
    335 Note: There is no guarantee that the string will be identical to the initial
    336 enable string, but semantically they will be identical.
    337 
    338 ## Checking whether a debug target is enabled
    339 
    340 After you've created a debug instance, you can determine whether or not it is
    341 enabled by checking the `enabled` property:
    342 
    343 ```javascript
    344 const debug = require('debug')('http');
    345 
    346 if (debug.enabled) {
    347   // do stuff...
    348 }
    349 ```
    350 
    351 You can also manually toggle this property to force the debug instance to be
    352 enabled or disabled.
    353 
    354 
    355 ## Authors
    356 
    357  - TJ Holowaychuk
    358  - Nathan Rajlich
    359  - Andrew Rhyne
    360 
    361 ## Backers
    362 
    363 Support us with a monthly donation and help us continue our activities. [[Become a backer](https://opencollective.com/debug#backer)]
    364 
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    395 
    396 
    397 ## Sponsors
    398 
    399 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)]
    400 
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    431 
    432 ## License
    433 
    434 (The MIT License)
    435 
    436 Copyright (c) 2014-2017 TJ Holowaychuk &lt;tj@vision-media.ca&gt;
    437 
    438 Permission is hereby granted, free of charge, to any person obtaining
    439 a copy of this software and associated documentation files (the
    440 'Software'), to deal in the Software without restriction, including
    441 without limitation the rights to use, copy, modify, merge, publish,
    442 distribute, sublicense, and/or sell copies of the Software, and to
    443 permit persons to whom the Software is furnished to do so, subject to
    444 the following conditions:
    445 
    446 The above copyright notice and this permission notice shall be
    447 included in all copies or substantial portions of the Software.
    448 
    449 THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
    450 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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