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(Deprecated
Deprecated because Grunt is practically unmaintained. Move on to something better. This package will continue to work with Grunt v1, but it will not receive any updates.
time-grunt 
Display the elapsed execution time of grunt tasks
Install
$ npm install --save-dev time-grunt
Usage
// Gruntfile.js
module.exports = grunt => {
// require it at the top and pass in the grunt instance
require('time-grunt')(grunt);
grunt.initConfig();
}
Optional callback
If you want to collect the timing stats for your own use, pass in a callback:
require('time-grunt')(grunt, (stats, done) => {
// do whatever you want with the stats
uploadReport(stats);
// be sure to let grunt know when to exit
done();
});
Clean layout
The watch task and tasks that take less than 1% of the total time are hidden to reduce clutter.
Run grunt with grunt --verbose to see all tasks.
Run grunt with grunt --quiet to quiet all tasks including time-grunt.
License
MIT © Sindre Sorhus