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6 changes: 4 additions & 2 deletions lib/install/is-only-dev.js
Original file line number Diff line number Diff line change
Expand Up @@ -5,13 +5,15 @@ 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
// Returns true if the module `node` is only required directly 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))
const isRequired = node.requiredBy.length > 0
const isTranstiveDependency = isRequired && node.requiredBy.every(andIsOnlyDev(moduleName(node), seen))
return isTranstiveDependency || !isRequired
}

// There is a known limitation with this implementation: If a dependency is
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