Assert the root path is a string

closes #16

Author: dougwilson

index.js

@@ -29,6 +29,10 @@ exports = module.exports = function serveStatic(root, options) {
     throw new TypeError('root path required')
   }
 
+  if (typeof root !== 'string') {
+    throw new TypeError('root path must be a string')
+  }
+
   // copy options object
   options = merge({}, options)
 

test/test.js

@@ -20,6 +20,10 @@ describe('serveStatic()', function(){
       serveStatic.bind().should.throw(/root path required/);
     });
 
+    it('should require root path to be string', function(){
+      serveStatic.bind(null, 42).should.throw(/root path.*string/);
+    });
+
     it('should serve static files', function(done){
       request(server)
       .get('/todo.txt')