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