ensure existing camelcasing is preserved

Author: jonschlinkert

index.js

@@ -9,6 +9,7 @@ function pascalcase(str) {
   if (typeof str !== 'string') {
     throw new TypeError('expected a string.');
   }
+  str = str.replace(/([A-Z])/g, ' $1');
   if (str.length === 1) { return str.toUpperCase(); }
   str = str.replace(/^[\W_]+|[\W_]+$/g, '').toLowerCase();
   str = str.charAt(0).toUpperCase() + str.slice(1);

test.js

@@ -14,6 +14,13 @@ describe('pascalcase', function () {
     pascalcase('foo bar baz').should.equal('FooBarBaz');
   });
 
+  it('should not lowercase existing camelcasing:', function () {
+    pascalcase('fooBarBaz').should.equal('FooBarBaz');
+    pascalcase('FooBarBaz').should.equal('FooBarBaz');
+    pascalcase(' FooBarBaz').should.equal('FooBarBaz');
+    pascalcase(' fooBarBaz').should.equal('FooBarBaz');
+  });
+
   it('should work with other non-word-characters:', function () {
     pascalcase('foo_bar-baz').should.equal('FooBarBaz');
     pascalcase('foo.bar.baz').should.equal('FooBarBaz');