Slowlog

A high-performance timer for React Native that helps you track big performance problems.
Use it as a first line of defense, before tools like system trace and perftools.


Quickstart

In your React Native project run:

$ npm i -S react-native-slowlog

This is added as a runtime dependency, and slowlog will only run in developer mode (using the __DEV__ flag).

To use slowlog apply it to your component this way:

``javascript
class Master extends Component {
constructor(props){
super(props)
slowlog(this, /.*/)

this.state = this.getDataSource(props)
this.shouldComponentUpdate = shouldComponentUpdate.bind(this)
}
...
}
`

Options

You can apply slowlog differently based on your needs:

`javascript
slowlog([this], [regex matching methods], { verbose: false, threshold: 16, log: console, excludes: [dict of excluded methods] })
`

* verbose - will output all timing information to console, and just slow operations to yellowbox
* threshold - in milliseconds. Anything above that goes to yellowbox
* log - a console-like object. Anything that responds to .log([msg]) and .warn([msg])
* excludes - a dict containing an exclusion list, like so {foobar:true, constructor:true} and so on. If you change this, remember to always
include constructor`

Contributing

Fork, implement, add tests, pull request, get my everlasting thanks and a respectable place here :).

Copyright

Copyright (c) 2016 Dotan Nahum @jondot. See LICENSE for further details.