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EDIT :: is-only-dev.js

'use strict' module.exports = isOnlyDev const moduleName = require('../utils/module-name.js') const isDevDep = require('./is-dev-dep.js') const isProdDep = require('./is-prod-dep.js') // Returns true if the module `node` is only required direcctly as a dev // dependency of the top level or transitively _from_ top level dev // dependencies. // Dual mode modules (that are both dev AND prod) should return false. function isOnlyDev (node, seen) { if (!seen) seen = new Set() return node.requiredBy.length && node.requiredBy.every(andIsOnlyDev(moduleName(node), seen)) } // There is a known limitation with this implementation: If a dependency is // ONLY required by cycles that are detached from the top level then it will // ultimately return true. // // This is ok though: We don't allow shrinkwraps with extraneous deps and // these situation is caught by the extraneous checker before we get here. function andIsOnlyDev (name, seen) { return function (req) { const isDev = isDevDep(req, name) const isProd = isProdDep(req, name) if (req.isTop) { return isDev && !isProd } else { if (seen.has(req)) return true seen.add(req) return isOnlyDev(req, seen) } } }

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