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20 lines
577 B
JavaScript
20 lines
577 B
JavaScript
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'use strict'
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module.exports = isOptional
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const isOptDep = require('./is-opt-dep.js')
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function isOptional (node, seen) {
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if (!seen) seen = new Set()
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// If a node is not required by anything, then we've reached
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// the top level package.
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if (seen.has(node) || node.requiredBy.length === 0) {
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return false
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}
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seen.add(node)
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const swOptional = node.fromShrinkwrap && node.package._optional
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return node.requiredBy.every(function (req) {
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if (req.fakeChild && swOptional) return true
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return isOptDep(req, node.package.name) || isOptional(req, seen)
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})
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}
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