Logs Automatically purges themselves
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+4
-2
@@ -1,4 +1,6 @@
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language: node_js
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node_js:
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- "0.10"
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- "0.8"
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- "node"
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- "6"
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- "4"
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- "0.12"
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-25
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build:
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mkdir -p lib
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rm -rf lib/*
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node_modules/.bin/coffee --compile --output lib/ src/
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watch:
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node_modules/.bin/coffee --watch --compile --output lib/ src/
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test:
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node_modules/.bin/mocha
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jumpstart:
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curl -u 'meryn' https://api.github.com/user/repos -d '{"name":"performance-now", "description":"Implements performance.now (based on process.hrtime).","private":false}'
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mkdir -p src
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touch src/performance-now.coffee
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mkdir -p test
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touch test/performance-now.coffee
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npm install
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git init
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git remote add origin git@github.com:meryn/performance-now
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git add .
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git commit -m "jumpstart commit."
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git push -u origin master
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.PHONY: test
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# performance-now [](https://travis-ci.org/meryn/performance-now) [](https://david-dm.org/meryn/performance-now)
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# performance-now [](https://travis-ci.org/braveg1rl/performance-now) [](https://david-dm.org/braveg1rl/performance-now)
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Implements a function similar to `performance.now` (based on `process.hrtime`).
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Modern browsers have a `window.performance` object with - among others - a `now` method which gives time in miliseconds, but with sub-milisecond precision. This module offers the same function based on the Node.js native `process.hrtime` function.
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According to the [High Resolution Time specification](http://www.w3.org/TR/hr-time/), the number of miliseconds reported by `performance.now` should be relative to the value of `performance.timing.navigationStart`. For this module, it's relative to when the time when this module got loaded. Right after requiring this module for the first time, the reported time is expected to have a near-zero value.
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Modern browsers have a `window.performance` object with - among others - a `now` method which gives time in milliseconds, but with sub-millisecond precision. This module offers the same function based on the Node.js native `process.hrtime` function.
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Using `process.hrtime` means that the reported time will be monotonically increasing, and not subject to clock-drift.
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According to the [High Resolution Time specification](http://www.w3.org/TR/hr-time/), the number of milliseconds reported by `performance.now` should be relative to the value of `performance.timing.navigationStart`.
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In the current version of the module (2.0) the reported time is relative to the time the current Node process has started (inferred from `process.uptime()`).
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Version 1.0 reported a different time. The reported time was relative to the time the module was loaded (i.e. the time it was first `require`d). If you need this functionality, version 1.0 is still available on NPM.
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## Example usage
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```javascript
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var now = require("performance-now")
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var start = now()
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var end = now()
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console.log(start.toFixed(3)) // ~ 0.05 on my system
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console.log(start.toFixed(3)) // the number of milliseconds the current node process is running
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console.log((start-end).toFixed(3)) // ~ 0.002 on my system
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```
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Running the now function two times right after each other yields a time difference of a few microseconds. Given this overhead, I think it's best to assume that the precision of intervals computed with this method is not higher than 10 microseconds, if you don't know the exact overhead on your own system.
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## Credits
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The initial structure of this module was generated by [Jumpstart](https://github.com/meryn/jumpstart), using the [Jumpstart Black Coffee](https://github.com/meryn/jumpstart-black-coffee) template.
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## License
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performance-now is released under the [MIT License](http://opensource.org/licenses/MIT).
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Copyright (c) 2013 Meryn Stol
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performance-now is released under the [MIT License](http://opensource.org/licenses/MIT).
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Copyright (c) 2017 Braveg1rl
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+8
-4
@@ -1,6 +1,6 @@
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// Generated by CoffeeScript 1.7.1
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// Generated by CoffeeScript 1.12.2
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(function() {
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var getNanoSeconds, hrtime, loadTime;
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var getNanoSeconds, hrtime, loadTime, moduleLoadTime, nodeLoadTime, upTime;
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if ((typeof performance !== "undefined" && performance !== null) && performance.now) {
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module.exports = function() {
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@@ -8,7 +8,7 @@
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};
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} else if ((typeof process !== "undefined" && process !== null) && process.hrtime) {
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module.exports = function() {
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return (getNanoSeconds() - loadTime) / 1e6;
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return (getNanoSeconds() - nodeLoadTime) / 1e6;
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};
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hrtime = process.hrtime;
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getNanoSeconds = function() {
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@@ -16,7 +16,9 @@
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hr = hrtime();
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return hr[0] * 1e9 + hr[1];
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};
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loadTime = getNanoSeconds();
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moduleLoadTime = getNanoSeconds();
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upTime = process.uptime() * 1e9;
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nodeLoadTime = moduleLoadTime - upTime;
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} else if (Date.now) {
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module.exports = function() {
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return Date.now() - loadTime;
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@@ -30,3 +32,5 @@
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}
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}).call(this);
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//# sourceMappingURL=performance-now.js.map
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+10
@@ -0,0 +1,10 @@
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{
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"version": 3,
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"file": "performance-now.js",
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"sourceRoot": "..",
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"sources": [
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"src/performance-now.coffee"
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],
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"names": [],
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"mappings": ";AAAA;AAAA,MAAA;;EAAA,IAAG,4DAAA,IAAiB,WAAW,CAAC,GAAhC;IACE,MAAM,CAAC,OAAP,GAAiB,SAAA;aAAG,WAAW,CAAC,GAAZ,CAAA;IAAH,EADnB;GAAA,MAEK,IAAG,oDAAA,IAAa,OAAO,CAAC,MAAxB;IACH,MAAM,CAAC,OAAP,GAAiB,SAAA;aAAG,CAAC,cAAA,CAAA,CAAA,GAAmB,YAApB,CAAA,GAAoC;IAAvC;IACjB,MAAA,GAAS,OAAO,CAAC;IACjB,cAAA,GAAiB,SAAA;AACf,UAAA;MAAA,EAAA,GAAK,MAAA,CAAA;aACL,EAAG,CAAA,CAAA,CAAH,GAAQ,GAAR,GAAc,EAAG,CAAA,CAAA;IAFF;IAGjB,cAAA,GAAiB,cAAA,CAAA;IACjB,MAAA,GAAS,OAAO,CAAC,MAAR,CAAA,CAAA,GAAmB;IAC5B,YAAA,GAAe,cAAA,GAAiB,OAR7B;GAAA,MASA,IAAG,IAAI,CAAC,GAAR;IACH,MAAM,CAAC,OAAP,GAAiB,SAAA;aAAG,IAAI,CAAC,GAAL,CAAA,CAAA,GAAa;IAAhB;IACjB,QAAA,GAAW,IAAI,CAAC,GAAL,CAAA,EAFR;GAAA,MAAA;IAIH,MAAM,CAAC,OAAP,GAAiB,SAAA;aAAO,IAAA,IAAA,CAAA,CAAM,CAAC,OAAP,CAAA,CAAJ,GAAuB;IAA1B;IACjB,QAAA,GAAe,IAAA,IAAA,CAAA,CAAM,CAAC,OAAP,CAAA,EALZ;;AAXL"
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}
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+1
-1
@@ -1,4 +1,4 @@
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Copyright (c) 2013 Meryn Stol
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Copyright (c) 2013 Braveg1rl
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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:
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+35
-43
@@ -1,76 +1,68 @@
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{
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"_args": [
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[
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"performance-now@^0.2.0",
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"c:\\users\\luis\\source\\repos\\AACharly\\node_modules\\azure-storage\\node_modules\\request"
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"performance-now@2.1.0",
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"C:\\Users\\Luis\\source\\repos\\AACloud"
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]
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],
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"_from": "performance-now@>=0.2.0-0 <0.3.0-0",
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"_id": "performance-now@0.2.0",
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"_inCache": true,
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"_from": "performance-now@2.1.0",
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"_id": "performance-now@2.1.0",
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"_inBundle": false,
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"_integrity": "sha1-Ywn04OX6kT7BxpMHrjZLSzd8nns=",
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"_location": "/performance-now",
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"_npmUser": {
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"email": "merynstol@gmail.com",
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"name": "meryn"
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},
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"_npmVersion": "1.3.24",
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"_phantomChildren": {},
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"_requested": {
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"type": "version",
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"registry": true,
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"raw": "performance-now@2.1.0",
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"name": "performance-now",
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"raw": "performance-now@^0.2.0",
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"rawSpec": "^0.2.0",
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"scope": null,
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"spec": ">=0.2.0-0 <0.3.0-0",
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"type": "range"
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"escapedName": "performance-now",
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"rawSpec": "2.1.0",
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"saveSpec": null,
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"fetchSpec": "2.1.0"
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},
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"_requiredBy": [
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"/azure-storage/request"
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"/request"
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],
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"_resolved": "https://registry.npmjs.org/performance-now/-/performance-now-0.2.0.tgz",
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"_shasum": "33ef30c5c77d4ea21c5a53869d91b56d8f2555e5",
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"_shrinkwrap": null,
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"_spec": "performance-now@^0.2.0",
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"_where": "c:\\users\\luis\\source\\repos\\AACharly\\node_modules\\azure-storage\\node_modules\\request",
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"_resolved": "https://registry.npmjs.org/performance-now/-/performance-now-2.1.0.tgz",
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"_spec": "2.1.0",
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"_where": "C:\\Users\\Luis\\source\\repos\\AACloud",
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"author": {
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"email": "merynstol@gmail.com",
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"name": "Meryn Stol"
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"name": "Braveg1rl",
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"email": "braveg1rl@outlook.com"
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},
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"bugs": {
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"url": "https://github.com/meryn/performance-now/issues"
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"url": "https://github.com/braveg1rl/performance-now/issues"
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},
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"dependencies": {},
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"description": "Implements performance.now (based on process.hrtime).",
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"devDependencies": {
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"coffee-script": "~1.7.1",
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"mocha": "~1.21.0"
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"bluebird": "^3.4.7",
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"call-delayed": "^1.0.0",
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"chai": "^3.5.0",
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"chai-increasing": "^1.2.0",
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"coffee-script": "~1.12.2",
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"mocha": "~3.2.0",
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"pre-commit": "^1.2.2"
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},
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"directories": {},
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"dist": {
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"shasum": "33ef30c5c77d4ea21c5a53869d91b56d8f2555e5",
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||||
"tarball": "https://registry.npmjs.org/performance-now/-/performance-now-0.2.0.tgz"
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},
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"homepage": "https://github.com/meryn/performance-now",
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"installable": true,
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"homepage": "https://github.com/braveg1rl/performance-now",
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"keywords": [],
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"license": "MIT",
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"main": "lib/performance-now.js",
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"maintainers": [
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{
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"name": "meryn",
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"email": "merynstol@gmail.com"
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}
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],
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"name": "performance-now",
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"optionalDependencies": {},
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"private": false,
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"repository": {
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"type": "git",
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"url": "git://github.com/meryn/performance-now.git"
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"url": "git://github.com/braveg1rl/performance-now.git"
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},
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"scripts": {
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"build": "mkdir -p lib && rm -rf lib/* && node_modules/.bin/coffee --compile -m --output lib/ src/",
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"prepublish": "npm test",
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"pretest": "make build",
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"test": "make test"
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"pretest": "npm run build",
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"test": "mocha",
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"watch": "coffee --watch --compile --output lib/ src/"
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},
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"version": "0.2.0"
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"typings": "src/index.d.ts",
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"version": "2.1.0"
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}
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+8
@@ -0,0 +1,8 @@
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// This file describes the package to typescript.
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/**
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* Returns the number of milliseconds since the page was loaded (if browser)
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* or the node process was started.
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*/
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declare function now(): number;
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export = now;
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+4
-2
@@ -1,12 +1,14 @@
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if performance? and performance.now
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module.exports = -> performance.now()
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else if process? and process.hrtime
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module.exports = -> (getNanoSeconds() - loadTime) / 1e6
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module.exports = -> (getNanoSeconds() - nodeLoadTime) / 1e6
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hrtime = process.hrtime
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getNanoSeconds = ->
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hr = hrtime()
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hr[0] * 1e9 + hr[1]
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loadTime = getNanoSeconds()
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moduleLoadTime = getNanoSeconds()
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upTime = process.uptime() * 1e9
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nodeLoadTime = moduleLoadTime - upTime
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else if Date.now
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module.exports = -> Date.now() - loadTime
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loadTime = Date.now()
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+38
-33
@@ -1,38 +1,43 @@
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assert = require "assert"
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chai = require "chai"
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chai.use(require "chai-increasing")
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{assert,expect} = chai
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Bluebird = require "bluebird"
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now = require "../"
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getUptime = -> process.uptime() * 1e3
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delay = (ms, fn) -> setTimeout fn, ms
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now = undefined
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describe "now", ->
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it "initially gives a near zero (< 20 ms) time ", ->
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now = require "../"
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assert now() < 20
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it "gives a positive time", ->
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assert now() > 0
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it "reported time differs at most 1ms from a freshly reported uptime", ->
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assert.isAtMost Math.abs(now()-getUptime()), 1
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it "two subsequent calls return an increasing number", ->
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a = now()
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b = now()
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assert now() < now()
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it "has less than 10 microseconds overhead", ->
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Math.abs(now() - now()) < 0.010
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it "can do 1,000,000 calls really quickly", ->
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now() for i in [0...1000000]
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it "shows that at least 990 ms has passed after a timeout of 1 second", (done) ->
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a = now()
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delay 1000, ->
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b = now()
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diff = b - a
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return done new Error "Diff (#{diff}) lower than 990." if diff < 990
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return done null
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assert.isBelow now(), now()
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it "shows that not more than 1020 ms has passed after a timeout of 1 second", (done) ->
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a = now()
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delay 1000, ->
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b = now()
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diff = b - a
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return done new Error "Diff (#{diff}) higher than 1020." if diff > 1020
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return done null
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||||
it "has less than 10 microseconds overhead", ->
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assert.isBelow Math.abs(now() - now()), 0.010
|
||||
|
||||
it "can be called 1 million times in under 1 second (averaging under 1 microsecond per call)", ->
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@timeout 1000
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now() for [0...1e6]
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undefined
|
||||
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||||
it "for 10,000 numbers, number n is never bigger than number n-1", ->
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stamps = (now() for [1...10000])
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expect(stamps).to.be.increasing
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||||
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||||
it "shows that at least 0.2 ms has passed after a timeout of 1 ms", ->
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earlier = now()
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Bluebird.resolve().delay(1).then -> assert.isAbove (now()-earlier), 0.2
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||||
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||||
it "shows that at most 3 ms has passed after a timeout of 1 ms", ->
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earlier = now()
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Bluebird.resolve().delay(1).then -> assert.isBelow (now()-earlier), 3
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||||
|
||||
it "shows that at least 190ms ms has passed after a timeout of 200ms", ->
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earlier = now()
|
||||
Bluebird.resolve().delay(200).then -> assert.isAbove (now()-earlier), 190
|
||||
|
||||
it "shows that at most 220 ms has passed after a timeout of 200ms", ->
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earlier = now()
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||||
Bluebird.resolve().delay(200).then -> assert.isBelow (now()-earlier), 220
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||||
+27
@@ -0,0 +1,27 @@
|
||||
Bluebird = require "bluebird"
|
||||
exec = require("child_process").execSync
|
||||
{assert} = require "chai"
|
||||
|
||||
describe "scripts/initital-value.coffee (module.uptime(), expressed in milliseconds)", ->
|
||||
result = exec("./test/scripts/initial-value.coffee").toString().trim()
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||||
it "printed #{result}", ->
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||||
it "printed a value above 100", -> assert.isAbove result, 100
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it "printed a value below 350", -> assert.isBelow result, 350
|
||||
|
||||
describe "scripts/delayed-require.coffee (sum of uptime and 250 ms delay`)", ->
|
||||
result = exec("./test/scripts/delayed-require.coffee").toString().trim()
|
||||
it "printed #{result}", ->
|
||||
it "printed a value above 350", -> assert.isAbove result, 350
|
||||
it "printed a value below 600", -> assert.isBelow result, 600
|
||||
|
||||
describe "scripts/delayed-call.coffee (sum of uptime and 250 ms delay`)", ->
|
||||
result = exec("./test/scripts/delayed-call.coffee").toString().trim()
|
||||
it "printed #{result}", ->
|
||||
it "printed a value above 350", -> assert.isAbove result, 350
|
||||
it "printed a value below 600", -> assert.isBelow result, 600
|
||||
|
||||
describe "scripts/difference.coffee", ->
|
||||
result = exec("./test/scripts/difference.coffee").toString().trim()
|
||||
it "printed #{result}", ->
|
||||
it "printed a value above 0.005", -> assert.isAbove result, 0.005
|
||||
it "printed a value below 0.07", -> assert.isBelow result, 0.07
|
||||
+11
@@ -0,0 +1,11 @@
|
||||
#!/usr/bin/env ./node_modules/.bin/coffee
|
||||
|
||||
###
|
||||
Expected output is a number above 350 and below 600.
|
||||
The time reported is relative to the time the node.js process was started
|
||||
this is approximately at `(Date.now() process.uptime() * 1000)`
|
||||
###
|
||||
|
||||
delay = require "call-delayed"
|
||||
now = require "../../lib/performance-now"
|
||||
delay 250, -> console.log now().toFixed 3
|
||||
+12
@@ -0,0 +1,12 @@
|
||||
#!/usr/bin/env ./node_modules/.bin/coffee
|
||||
|
||||
###
|
||||
Expected output is a number above 350 and below 600.
|
||||
The time reported is relative to the time the node.js process was started
|
||||
this is approximately at `(Date.now() process.uptime() * 1000)`
|
||||
###
|
||||
|
||||
delay = require "call-delayed"
|
||||
delay 250, ->
|
||||
now = require "../../lib/performance-now"
|
||||
console.log now().toFixed 3
|
||||
+6
@@ -0,0 +1,6 @@
|
||||
#!/usr/bin/env ./node_modules/.bin/coffee
|
||||
|
||||
# Expected output is above 0.005 and below 0.07.
|
||||
|
||||
now = require('../../lib/performance-now')
|
||||
console.log -(now() - now()).toFixed 3
|
||||
+10
@@ -0,0 +1,10 @@
|
||||
#!/usr/bin/env ./node_modules/.bin/coffee
|
||||
|
||||
###
|
||||
Expected output is a number above 100 and below 350.
|
||||
The time reported is relative to the time the node.js process was started
|
||||
this is approximately at `(Date.now() process.uptime() * 1000)`
|
||||
###
|
||||
|
||||
now = require '../../lib/performance-now'
|
||||
console.log now().toFixed 3
|
||||
Reference in new issue
Block a user