| Path : /opt/nvm/versions/node/v9.11.2/lib/node_modules/npm/lib/install/ |
| Current File : //opt/nvm/versions/node/v9.11.2/lib/node_modules/npm/lib/install/is-only-optional.js |
'use strict'
module.exports = isOptional
const isOptDep = require('./is-opt-dep.js')
function isOptional (node, seen) {
if (!seen) seen = new Set()
// If a node is not required by anything, then we've reached
// the top level package.
if (seen.has(node) || node.requiredBy.length === 0) {
return false
}
seen.add(node)
return node.requiredBy.every(function (req) {
return isOptDep(req, node.package.name) || isOptional(req, seen)
})
}