Throw an informative error on missing modules.

index.js

@@ -34,7 +34,13 @@ module.exports = function(options) {
       // This searches up from the specified package.json file, making sure
       // the config option behaves as expected. See issue #56.
       var searchFor = path.join('node_modules', name);
-      return require(findup(searchFor, {cwd: path.dirname(config)}) || name);
+
+      var src = findup(searchFor, {cwd: path.dirname(config)}) || name;
+      if (src !== null) {
+        return require(src);
+      } else {
+        throw new Error('Cannot find `' + name + '` in your node_modules!');
+      }
     };
   } else {
     requireFn = require;
@@ -82,7 +88,7 @@ module.exports = function(options) {
 
   multimatch(names, pattern).forEach(function(name) {
     if(scopeTest.test(name)) {
-	  var decomposition = scopeDecomposition.exec(name);
+      var decomposition = scopeDecomposition.exec(name);
 
       if(!finalObject.hasOwnProperty(decomposition[1])) {
         finalObject[decomposition[1]] = {};

package.json

@@ -26,7 +26,8 @@
     "Julien Fontanet <julien.fontanet@vates.fr>",
     "Callum Macrae",
     "Hutson Betts",
-    "Christian Maniewski"
+    "Christian Maniewski",
+    "Connor Peet"
   ],
   "license": "MIT",
   "dependencies": {

test/index.js

@@ -198,7 +198,15 @@ describe('with lazy loading', function() {
   });
 });
 
-describe('requiring from another directory', function() {
+describe('common functionality', function () {
+  it('throws a sensible error when not found', function () {
+    var x = gulpLoadPlugins({ config: __dirname + '/package.json' });
+
+    assert.throws(function () {
+      x.oops();
+    }, /Cannot find module 'gulp-oops'/);
+  });
+
   it('allows you to use in a lower directory', function() {
     var plugins = require('../')();
     assert.ok(typeof plugins.test === 'function');

test/package.json

@@ -1,6 +1,7 @@
 {
   "dependencies": {
     "gulp-test": "*",
-    "gulp-test-global": "*"
+    "gulp-test-global": "*",
+    "gulp-oops": "*"
   }
 }