deps: Guard against null "bin" values in package.json

Fixes: #13997
Credit: @IonicaBizau
PR-URL: #13999
Reviewed-By: @iarna

Author: IonicaBizau

lib/install/deps.js

@@ -612,13 +612,13 @@ var earliestInstallable = exports.earliestInstallable = function (requiredBy, tr
 
   // If any of the children of this tree have conflicting
   // binaries then we need to decline to install this package here.
-  var binaryMatches = typeof pkg.bin === 'object' && tree.children.some(function (child) {
-    if (child.removed) return false
-    if (typeof child.package.bin !== 'object') return false
+  var binaryMatches = pkg.bin && tree.children.some(function (child) {
+    if (child.removed || !child.package.bin) return false
     return Object.keys(child.package.bin).some(function (bin) {
       return pkg.bin[bin]
     })
   })
+
   if (binaryMatches) return null
 
   // if this tree location requested the same module then we KNOW it

test/tap/install-bin-null.js

@@ -0,0 +1,91 @@
+var fs = require('graceful-fs')
+var path = require('path')
+
+var mkdirp = require('mkdirp')
+var osenv = require('osenv')
+var rimraf = require('rimraf')
+var test = require('tap').test
+
+var common = require('../common-tap.js')
+
+var pkg = path.join(__dirname, 'install-bin-null')
+
+var EXEC_OPTS = { cwd: pkg }
+
+var parentPkg = {
+  name: 'parent-package',
+  version: '0.0.0',
+  dependencies: {
+    'child-package-a': 'file:./child-package-a',
+    'child-package-b': 'file:./child-package-b'
+  }
+}
+
+var childPkgA = {
+  name: 'child-package-a',
+  version: '0.0.0',
+  bin: 'index.js'
+}
+
+var childPkgB = {
+  name: 'child-package-b',
+  version: '0.0.0',
+  dependencies: {
+    'grandchild-package': 'file:../grandchild-package'
+  }
+}
+
+var grandchildPkg = {
+  name: 'grandchild-package',
+  version: '0.0.0',
+  bin: null
+}
+
+var pkgs = [childPkgA, childPkgB, grandchildPkg]
+
+test('the grandchild has bin:null', function (t) {
+  setup()
+  common.npm(['install'], EXEC_OPTS, function (err, code, stdout, stderr) {
+    t.ifErr(err, 'npm link finished without error')
+    t.equal(code, 0, 'exited ok')
+    t.ok(stdout, 'output indicating success')
+    t.notOk(stderr, 'no output stderr')
+    t.end()
+  })
+})
+
+test('cleanup', function (t) {
+  cleanup()
+  t.end()
+})
+
+function cleanup () {
+  process.chdir(osenv.tmpdir())
+  rimraf.sync(pkg)
+}
+
+function setup () {
+  cleanup()
+  mkdirp.sync(pkg)
+  fs.writeFileSync(
+    path.join(pkg, 'package.json'),
+    JSON.stringify(parentPkg, null, 2)
+  )
+  pkgs.forEach(function (json) {
+    process.chdir(mkPkg(json))
+  })
+  fs.writeFileSync(
+    path.join(pkg, childPkgA.name, 'index.js'),
+    ''
+  )
+}
+
+function mkPkg (json) {
+  var pkgPath = path.resolve(pkg, json.name)
+  mkdirp.sync(pkgPath)
+  fs.writeFileSync(
+    path.join(pkgPath, 'package.json'),
+    JSON.stringify(json, null, 2)
+  )
+  return pkgPath
+}