const npa = require('npm-package-arg') // extracted from npm v6 lib/install/realize-shrinkwrap-specifier.js const specFromLock = (name, lock, where) => { try { if (lock.version) { const spec = npa.resolve(name, lock.version, where) if (lock.integrity || spec.type === 'git') { return spec } } if (lock.from) { // legacy metadata includes "from", but not integrity const spec = npa.resolve(name, lock.from, where) if (spec.registry && lock.version) { return npa.resolve(name, lock.version, where) } else if (!lock.resolved) { return spec } } if (lock.resolved) { return npa.resolve(name, lock.resolved, where) } } catch { // ignore errors } try { return npa.resolve(name, lock.version, where) } catch { return {} } } module.exports = specFromLock