How much code did you write compared to code installed with npm?

compare.js

#!/usr/bin/env node
var stdin = process.openStdin()
var data = ''

stdin
    .on('data', function(chunk) {
        data += chunk
    })
    .on('end', function(){
        parse(data)
    })

function parse(data) {
    var mine = 0
    var theirs = 0
    var total = 0
    var length
    data = JSON.parse(data)
    for (var key in data) {
        length = data[key].source.length
        if (data[key].id.indexOf('node_modules') < 0) {
            mine += length
        } else {
            theirs += length
        }
        total += length
    }
    console.log('mine: ' + percentify(mine, total) + '%, theirs: ' + percentify(theirs, total) + '%')
}

function percentify(val, total) {
    return Math.round(val/total*100)
}

Use with Browserify:

$ browserify ./your-lib.js --deps | ./compare.js

Outputs:

mine: 20%, theirs: 80%

I made this into a module: https://github.com/christophercliff/browserify-summary