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