mocha + babel programmatic example

[mbrevda]

I'm trying to set up a project for coverage using mocha and babel. I've looked at lots of tutorials - all the examples I have seen are cli based. Where can I find a programmatic approach to testing + generating a coverage report programmatically?

[mbrevda]

To answer my own question, here is what I got working. Note this uses the babel coverage plugin. If anyone knows how to avoid using this, I would prefer not to have to include more deps. Leaving open in hope that this dep can be removed!

// set up babel require hook to transparently load files
require('babel-core/register')({
    presets: ['es2015'],
    plugins: ["__coverage__"]
})

// babel wont work in this file thought
var Mocha = require('mocha'),
    glob = require('glob'),
    istanbul = require('istanbul'),
    mocha = new Mocha({}),
    collector = new istanbul.Collector(),
    reporter = new istanbul.Reporter()

// set up files to be tested by mocha
var addTests = function() {
    return new Promise(function(resolve, reject){
        glob('./**/*Test.js', (err, files) => {
            if (err) return reject(err)
            files.forEach(file => mocha.addFile(file))
            resolve()
        })
    })
}

// runner
var run = function() {
    mocha.run(failures => {

        // before exiting, print coverage report
        collector.add(global.__coverage__)
        reporter.addAll([ 'text', 'html'])
        reporter.write(collector, true, () => {
            console.log('Coverage report saved to coverage/index.html')
        })

        // exit, on non-zero if there are failed tests
        process.on('exit', () => process.exit(failures))
    })
}

// GO!
addTests().then(run)