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// when an optional dep fails to install, we need to remove the branch of the
// graph up to the first optionalDependencies, as well as any nodes that are
// only required by other nodes in the set.
//
// This function finds the set of nodes that will need to be removed in that
// case.
//
// Note that this is *only* going to work with trees where calcDepFlags
// has been called, because we rely on the node.optional flag.
const gatherDepSet = require('./gather-dep-set.js')
const optionalSet = node => {
if (!node.optional) {
return new Set()
}
// start with the node, then walk up the dependency graph until we
// get to the boundaries that define the optional set. since the
// node is optional, we know that all paths INTO this area of the
// graph are optional, but there may be non-optional dependencies
// WITHIN the area.
const set = new Set([node])
for (const node of set) {
for (const edge of node.edgesIn) {
if (!edge.optional) {
set.add(edge.from)
}
}
}
// now that we've hit the boundary, gather the rest of the nodes in
// the optional section. that's the set of dependencies that are only
// depended upon by other nodes within the set, or optional dependencies
// from outside the set.
return gatherDepSet(set, edge => !edge.optional)
}
module.exports = optionalSet
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