feat(utils): Resolve paths for scoped node modules.

test/utils.test.js

@@ -144,4 +144,14 @@ describe('utils', () => {
     var chaiJsPath = utils.resolveModulePath(path.join('chai', 'lib', 'chai.js'));
     expect(chaiJsPath).to.equal(path.join(chaiPath, 'lib', 'chai.js'));
   });
+
+  it('should get the path for a scoped module', () => {
+    expect(utils.resolveModulePath('@some-scope/not-a-real-package')).to.be.undefined;
+
+    var modulePath = utils.resolveModulePath('@semantic-release/changelog');
+    expect(modulePath).to.exist;
+
+    var indexPath = utils.resolveModulePath('@semantic-release/changelog/index.js');
+    expect(indexPath).to.equal(path.join(modulePath, 'index.js'));
+  });
 });

utils.js

@@ -134,12 +134,16 @@ const getPackage = function(packageName) {
  */
 const resolveModulePath = function(modulePath, optBasedir) {
   try {
-    var match = modulePath.match(/([^/]+)\/?(.*)/);
-    if (match && match[1]) {
-      var basePath = path.dirname(resolve.sync(path.join(match[1], 'package.json'), {
+    var parts = modulePath.split(path.sep);
+    if (parts && parts.length) {
+      // if the package is scoped, use the first two parts of the path. ie, @scope/package.
+      var packageName = parts[0].startsWith('@') ? path.join(parts.shift(), parts.shift()) : parts.shift();
+      var basePath = path.dirname(resolve.sync(path.join(packageName, 'package.json'), {
         basedir: optBasedir
       }));
-      return path.join(basePath, match[2]);
+
+      // join the remaining path to the resource (if any)
+      return path.join(basePath, parts.join(path.sep));
     }
   } catch (e) {
   }