diff --git a/smoke-tests/test/bundled-deps-resolve.js b/smoke-tests/test/bundled-deps-resolve.js
new file mode 100644
index 0000000000000..145a40753a253
--- /dev/null
+++ b/smoke-tests/test/bundled-deps-resolve.js
@@ -0,0 +1,95 @@
+const t = require('tap')
+const { join } = require('node:path')
+const fs = require('node:fs')
+const { createRequire } = require('node:module')
+const setup = require('./fixtures/setup.js')
+
+// Walk an installed package tree and assert that every non-optional
+// production dependency of every bundled package resolves from that
+// package's own directory. This catches deps that were dropped from the
+// hoisted bundle at pack time (e.g. a dev-only copy shadowing the real
+// production version), which unit tests miss because they run against the
+// source tree where a nested copy still resolves. See PR #9740 / #9722
+// where `sigstore` went missing from the packed bundle.
+const findMissingDeps = (npmRoot) => {
+  const req = createRequire(join(npmRoot, 'package.json'))
+  const missing = []
+  const seen = new Set()
+  const stack = [npmRoot]
+
+  while (stack.length) {
+    const dir = stack.pop()
+    if (seen.has(dir)) {
+      continue
+    }
+    seen.add(dir)
+
+    let pkg
+    try {
+      pkg = JSON.parse(fs.readFileSync(join(dir, 'package.json'), 'utf8'))
+    } catch {
+      continue
+    }
+
+    const optional = new Set(Object.keys(pkg.optionalDependencies || {}))
+    for (const dep of Object.keys(pkg.dependencies || {})) {
+      if (optional.has(dep)) {
+        continue
+      }
+      try {
+        req.resolve(dep, { paths: [dir] })
+      } catch {
+        missing.push(`${pkg.name || dir} -> ${dep}`)
+      }
+    }
+
+    const nodeModules = join(dir, 'node_modules')
+    let entries
+    try {
+      entries = fs.readdirSync(nodeModules, { withFileTypes: true })
+    } catch {
+      continue
+    }
+    for (const entry of entries) {
+      if (entry.name === '.bin') {
+        continue
+      }
+      const entryPath = join(nodeModules, entry.name)
+      if (entry.name.startsWith('@')) {
+        for (const scoped of fs.readdirSync(entryPath, { withFileTypes: true })) {
+          stack.push(join(entryPath, scoped.name))
+        }
+      } else {
+        stack.push(entryPath)
+      }
+    }
+  }
+
+  return missing.sort()
+}
+
+t.test('bundled production deps all resolve from the packed bundle', async t => {
+  const {
+    npm,
+    npmLocalTarball,
+    paths: { globalNodeModules },
+  } = await setup(t, {
+    testdir: {
+      project: {
+        'package.json': { name: 'npm', version: '999.999.999' },
+      },
+    },
+  })
+
+  const tarball = await npmLocalTarball()
+  await npm('install', tarball, '--global')
+
+  const npmRoot = join(globalNodeModules, 'npm')
+  const missing = findMissingDeps(npmRoot)
+
+  t.strictSame(
+    missing,
+    [],
+    'every non-optional production dependency resolves in the packed bundle'
+  )
+})