feat: Allow use of require('ical-generator') without .default

Closes #253

README.md

@@ -92,12 +92,6 @@ npm run browser-test
 
 ## 🙋 FAQ
 
-### I updated to `ical-generator@2.x.x` and now get `TypeError: ical is not a function` errors
-
-If you still want to use `require()` to import in version 2 onwards, please use `require('ical-generator').default`.
-The reason for this change is that from version 2 on, other objects such as types and interfaces required for typescript
-are exported as well ([#247](https://github.com/sebbo2002/ical-generator/issues/247)).
-
 ### What's `Error: Can't resolve 'fs'`?
 `ical-generator` uses the node.js `fs` module to save your calendar on the filesystem. In browser environments, you usually don't need this, so if you pass `null` for fs in your bundler. In webpack this looks like this:
 

src/index.ts

@@ -40,10 +40,12 @@ import ICalCalendar, {ICalCalendarData} from './calendar';
  *
  * @param data Calendar data
  */
-export default function (data?: ICalCalendarData): ICalCalendar {
+function ical(data?: ICalCalendarData): ICalCalendar {
     return new ICalCalendar(data);
 }
 
+export default ical;
+
 export {
     default as ICalAlarm,
     ICalAlarmData,
@@ -102,3 +104,8 @@ export {
     escape,
     foldLines
 } from './tools';
+
+/* istanbul ignore else */
+if (typeof module !== 'undefined') {
+    module.exports = Object.assign(ical, module.exports);
+}