babel-plugin-console-perf
v0.0.3
Published
A plugin that makes it easy to profile functions using console.profile and console.time functions
Downloads
83
Maintainers
Readme
babel-plugin-console-perf
A babel plugin to simplifies the usage of profiling in JS functions. I
got this idea when browsing documentation on various console
methods,
and discovered that there's a console.profile/profileEnd
function that
automatically starts and stops the JavaScript profiler for a particular
region inside the function. I wanted to make this as seamless as
possible.
Note: Alpha quality program. Use with caution, and never use this to production
Usage
- Install the plugin using
npm install --save-dev babel-plugin-console-perf
- Add the plugin
console-perf
to your.babelrc
- Add a comment
// profile
in the function you want to profile - Open the JS console in your browser, and navigate to the profiling tab. Note that on latest Chrome (Canary is what I generally use) the tool has been moved into the "more tools" section. This is not the Performance tab, by the way.
- Load the page which calls the function where you added comment.
That should record individual profiles for each of the runs in case the function gets called multiple times.
Here's a video of the usage in action: console-perf-demo
Will try to put up a GIF as and when I get a chance.
If there are return
statements, it checks to see if there are
statements/expressions there, and then re-assigns them to variables and
returns the variable instead. This ensures that the
statements/expressions are also profiled. For instance:
function getHash () {
// profile
const a = 42;
return heavyCryptoFunction({ key: a });
}
gets converted to:
function getHash () {
console.profile('getHash');
const a = 42;
const hash = heavyCryptoFunction({ key: a});
console.profileEnd();
return hash;
}
instead of:
function getHash () {
console.profile('getHash');
const a = 42;
console.profileEnd();
return heavyCryptoFunction({ key: a });
}
which misses out on profiling a potentially CPU-heavy function.
Checkout other console
-based plugins that I wrote: