fix: skip missing optional deps when bundling, closes npm/cli#5924 (#149)

Author: nlf

lib/index.js

@@ -384,6 +384,11 @@ class PackWalker extends IgnoreWalker {
 
       // get a reference to the node we're bundling
       const node = this.tree.edgesOut.get(dep).to
+      // if there's no node, this is most likely an optional dependency that hasn't been
+      // installed. just skip it.
+      if (!node) {
+        continue
+      }
       // we use node.path for the path because we want the location the node was linked to,
       // not where it actually lives on disk
       const path = node.path

test/bundled-missing-optional.js

@@ -0,0 +1,52 @@
+'use strict'
+
+const Arborist = require('@npmcli/arborist')
+const t = require('tap')
+const packlist = require('../')
+
+const elfJS = `
+module.exports = elf =>
+  console.log("i'm a elf")
+`
+
+t.test('includes bundled dependency using bundleDependencies', async (t) => {
+  const pkg = t.testdir({
+    'package.json': JSON.stringify({
+      name: 'test-package',
+      version: '3.1.4',
+      main: 'elf.js',
+      dependencies: {
+        history: '1.0.0',
+      },
+      bundleDependencies: [
+        'history',
+      ],
+    }),
+    'elf.js': elfJS,
+    '.npmrc': 'packaged=false',
+    node_modules: {
+      history: {
+        'package.json': JSON.stringify({
+          name: 'history',
+          version: '1.0.0',
+          main: 'index.js',
+          optionalDependencies: {
+            // defined here, but not installed
+            optionalDep: '^1.0.0',
+          },
+        }),
+        'index.js': elfJS,
+      },
+    },
+  })
+
+  const arborist = new Arborist({ path: pkg })
+  const tree = await arborist.loadActual()
+  const files = await packlist(tree)
+  t.same(files, [
+    'elf.js',
+    'node_modules/history/index.js',
+    'node_modules/history/package.json',
+    'package.json',
+  ])
+})