blob: 09ae3178295adba4cf80764a1b1b1c61a6642fcc (
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const {parse, sep, normalize: norm} = require('path')
function* commonArrayMembers (a, b) {
const [l, s] = a.length > b.length ? [a, b] : [b, a]
for (const x of s) {
if (x === l.shift())
yield x
else
break
}
}
const commonAncestorPath = (a, b) => a === b ? a
: parse(a).root !== parse(b).root ? null
: [...commonArrayMembers(norm(a).split(sep), norm(b).split(sep))].join(sep)
module.exports = (...paths) => paths.reduce(commonAncestorPath)
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