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'use strict'
module.exports = isExtraneous
function isExtraneous (tree) {
var result = !isNotExtraneous(tree)
return result
}
function isNotRequired (tree) {
return tree.requiredBy && tree.requiredBy.length === 0
}
function parentHasNoPjson (tree) {
return tree.parent && tree.parent.isTop && tree.parent.error
}
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 (isNotRequired(tree) && parentHasNoPjson(tree)) {
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))
})
}
}