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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)
|
|
