Default to index handler file if no "." in handler config value

Author: aychtang

__tests__/fixtures/index.js

@@ -0,0 +1 @@
+module.exports = require('./foo');

__tests__/include-dependencies.js

@@ -267,6 +267,12 @@ test('processFunction should include individually', t => {
   ]);
 });
 
+test('getHandlerFilename should default to index where there is no . in the handler name', t => {
+  const instance = createTestInstance();
+
+  t.deepEqual(instance.getHandlerFilename('https'), path.join(__dirname, 'fixtures', 'index.js'));
+});
+
 test('getHandlerFilename should handle a simple handler expression', t => {
   const instance = createTestInstance();
 

include-dependencies.js

@@ -130,7 +130,8 @@ module.exports = class IncludeDependencies {
   }
 
   getHandlerFilename(handler) {
-    const handlerPath = handler.slice(0, handler.lastIndexOf('.'));
+    const lastDotIndex = handler.lastIndexOf('.');
+    const handlerPath = lastDotIndex !== -1 ? handler.slice(0, lastDotIndex) : 'index';
     return require.resolve((path.join(this.serverless.config.servicePath, handlerPath)));
   }