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EDIT :: is-extraneous.js

'use strict' module.exports = isExtraneous function isExtraneous (tree) { var result = !isNotExtraneous(tree) return result } function topHasNoPjson (tree) { var top = tree while (!top.isTop) top = top.parent return top.error } function isNotExtraneous (tree, isCycle) { if (!isCycle) isCycle = {} if (tree.isTop || tree.userRequired) { return true } else if (isCycle[tree.path]) { return topHasNoPjson(tree) } else { isCycle[tree.path] = true return tree.requiredBy && tree.requiredBy.some(function (node) { return isNotExtraneous(node, Object.create(isCycle)) }) } }

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