├── index.js
├── package.json
├── .gitignore
├── LICENSE
└── README.md


/index.js:
--------------------------------------------------------------------------------
 1 | module.exports = function (content) {
 2 |     this.cacheable()
 3 |     var start = this.resource + '--start'
 4 |     var end = this.resource + '--end'
 5 |     return (
 6 |         '\n' +
 7 |         'try { window.performance.mark(\'' + start + '\') } catch (e) {};\n' +
 8 |         content + '\n' +
 9 |         'try { window.performance.mark(\'' + end + '\');\n' +
10 |         'window.performance.measure(\'' + this.resource + '\', \'' + start + '\', \'' + end + '\')\n' +
11 |         '} catch (e) {};'
12 |     )
13 | }
14 | 


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/package.json:
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 1 | {
 2 |   "name": "performance-loader",
 3 |   "version": "1.0.0",
 4 |   "description": "performance-loader for webpack",
 5 |   "main": "index.js",
 6 |   "scripts": {
 7 |     "test": "echo \"Error: no test specified\" && exit 1"
 8 |   },
 9 |   "repository": {
10 |     "type": "git",
11 |     "url": "git+https://github.com/maxkostow/performance-loader.git"
12 |   },
13 |   "keywords": [
14 |     "webpack",
15 |     "performance"
16 |   ],
17 |   "author": "Max Kostow",
18 |   "license": "MIT",
19 |   "bugs": {
20 |     "url": "https://github.com/maxkostow/performance-loader/issues"
21 |   },
22 |   "homepage": "https://github.com/maxkostow/performance-loader#readme"
23 | }
24 | 


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/.gitignore:
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 1 | # Logs
 2 | logs
 3 | *.log
 4 | npm-debug.log*
 5 | 
 6 | # Runtime data
 7 | pids
 8 | *.pid
 9 | *.seed
10 | 
11 | # Directory for instrumented libs generated by jscoverage/JSCover
12 | lib-cov
13 | 
14 | # Coverage directory used by tools like istanbul
15 | coverage
16 | 
17 | # nyc test coverage
18 | .nyc_output
19 | 
20 | # Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
21 | .grunt
22 | 
23 | # node-waf configuration
24 | .lock-wscript
25 | 
26 | # Compiled binary addons (http://nodejs.org/api/addons.html)
27 | build/Release
28 | 
29 | # Dependency directories
30 | node_modules
31 | jspm_packages
32 | 
33 | # Optional npm cache directory
34 | .npm
35 | 
36 | # Optional REPL history
37 | .node_repl_history
38 | 


--------------------------------------------------------------------------------
/LICENSE:
--------------------------------------------------------------------------------
 1 | The MIT License (MIT)
 2 | 
 3 | Copyright (c) 2016 Max Kostow
 4 | 
 5 | Permission is hereby granted, free of charge, to any person obtaining a copy
 6 | of this software and associated documentation files (the "Software"), to deal
 7 | in the Software without restriction, including without limitation the rights
 8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 9 | copies of the Software, and to permit persons to whom the Software is
10 | furnished to do so, subject to the following conditions:
11 | 
12 | The above copyright notice and this permission notice shall be included in all
13 | copies or substantial portions of the Software.
14 | 
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 | SOFTWARE.
22 | 


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/README.md:
--------------------------------------------------------------------------------
 1 | # performance-loader
 2 | 
 3 | Wraps modules in the browser performance API.
 4 | 
 5 | ## Installation
 6 | 
 7 | `npm install performance-loader --save-dev`
 8 | 
 9 | ## Usage
10 | 
11 | [Documentation: Using loaders](http://webpack.github.io/docs/using-loaders.html)
12 | 
13 | ### Example config
14 | 
15 | ``` javascript
16 | module.exports = {
17 |   module: {
18 |     postLoaders: [
19 |       { loader: "performance-loader" },
20 |     ]
21 |   }
22 | };
23 | ```
24 | 
25 | ### In browser
26 | 
27 | After initializing the page in a browser try:
28 | 
29 | ```javascript
30 | console.table(
31 |     window.performance.getEntriesByType('measure')
32 |         .filter(p => p.duration > 1) // only modules that took longer than 1ms
33 |         .sort((a, b) => b.duration - a.duration) // sort by descending duration
34 |         .map(p => [p.name, p.duration]) // map for the table
35 | )
36 | // table of modules that took longer than 1ms to run
37 | ```
38 | 
39 | ## How it works
40 | 
41 | It wraps your modules in [`performance.mark`](https://developer.mozilla.org/en-US/docs/Web/API/Performance/mark) and then calls [`performance.measure`](https://developer.mozilla.org/en-US/docs/Web/API/Performance/measure).
42 | 
43 | ```javascript
44 | window.performance.mark('/path/to/module.js--start')
45 | /*** module.js code here ***/
46 | window.performance.mark('/path/to/module.js--end')
47 | window.performance.measure('/path/to/module.js', '/path/to/module.js--start', '/path/to/module.js--end')
48 | ```
49 | 


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