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8468bdbefc
PR-URL: https://github.com/nodejs/node/pull/40055 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Beth Griggs <bgriggs@redhat.com>
39 lines
1.3 KiB
JavaScript
39 lines
1.3 KiB
JavaScript
// when an optional dep fails to install, we need to remove the branch of the
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// graph up to the first optionalDependencies, as well as any nodes that are
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// only required by other nodes in the set.
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//
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// This function finds the set of nodes that will need to be removed in that
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// case.
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//
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// Note that this is *only* going to work with trees where calcDepFlags
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// has been called, because we rely on the node.optional flag.
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const gatherDepSet = require('./gather-dep-set.js')
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const optionalSet = node => {
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if (!node.optional) {
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return new Set()
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}
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// start with the node, then walk up the dependency graph until we
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// get to the boundaries that define the optional set. since the
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// node is optional, we know that all paths INTO this area of the
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// graph are optional, but there may be non-optional dependencies
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// WITHIN the area.
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const set = new Set([node])
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for (const node of set) {
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for (const edge of node.edgesIn) {
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if (!edge.optional) {
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set.add(edge.from)
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}
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}
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}
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// now that we've hit the boundary, gather the rest of the nodes in
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// the optional section. that's the set of dependencies that are only
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// depended upon by other nodes within the set, or optional dependencies
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// from outside the set.
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return gatherDepSet(set, edge => !edge.optional)
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}
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module.exports = optionalSet
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