my-idlers/node_modules/commondir/index.js

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var path = require('path');
module.exports = function (basedir, relfiles) {
if (relfiles) {
var files = relfiles.map(function (r) {
return path.resolve(basedir, r);
});
}
else {
var files = basedir;
}
var res = files.slice(1).reduce(function (ps, file) {
if (!file.match(/^([A-Za-z]:)?\/|\\/)) {
throw new Error('relative path without a basedir');
}
var xs = file.split(/\/+|\\+/);
for (
var i = 0;
ps[i] === xs[i] && i < Math.min(ps.length, xs.length);
i++
);
return ps.slice(0, i);
}, files[0].split(/\/+|\\+/));
// Windows correctly handles paths with forward-slashes
return res.length > 1 ? res.join('/') : '/'
};