feat(nodejs): adds SSR support (#65)

src/ICalendar.js

@@ -1,5 +1,5 @@
 import CalendarBase from './CalendarBase'
-import { formatText, getUid, getRrule, download } from './utils/ics'
+import { formatText, getUid, getProdId, getRrule, download } from './utils/ics'
 import { getTimeCreated } from './utils/time'
 
 /**
@@ -52,6 +52,8 @@ export default class ICalendar extends CalendarBase {
 
   /**
    * Downloads the rendered iCalendar.
+   * 
+   * @note Only works in browsers.
    */
   download () {
     download(this.title, this.render())
@@ -82,7 +84,7 @@ export default class ICalendar extends CalendarBase {
 
     const uid = getUid()
     const timeCreated = getTimeCreated()
-    const host = window.location.host
+    const host = getProdId()
     const calendar = [
       'BEGIN:VCALENDAR',
       'VERSION:2.0',

src/__tests__/ICalendar.spec.js

@@ -1,6 +1,6 @@
 import moment from 'moment'
 import { FORMAT } from '../constants'
-import { formatText, getUid, getRrule, download } from '../utils/ics'
+import { formatText, getUid, getProdId, download } from '../utils/ics'
 import { getTimeCreated } from '../utils/time'
 import CalendarBase from '../CalendarBase'
 import ICalendar from '../ICalendar'
@@ -52,15 +52,7 @@ describe('ICalendar', () => {
     beforeEach(() => {
       formatText.mockImplementation((...args) => args.join(' formatted '))
       getUid.mockReturnValue(24)
-
-      Object.defineProperty(global, 'window', {
-        value: {
-          location: {
-            host: 'foobar',
-          },
-        },
-        writable: true,
-      })
+      getProdId.mockReturnValue('foobar')
     })
 
     afterEach(() => {

src/utils/__tests__/ics.spec.js

@@ -7,6 +7,7 @@ import {
   getUid,
   getRrule,
   download,
+  getProdId,
 } from '../ics'
 import { formatTimestampString } from '../time'
 import FileSaver from 'file-saver';
@@ -111,6 +112,30 @@ describe('IcsUtil', () => {
     })
   })
 
+  describe('getProdId()', () => {
+    it('should return `datebook` in a non-browser context', () => {
+      Object.defineProperty(global, 'window', {
+        value: undefined,
+        writable: true
+      })
+
+      expect(getProdId()).toEqual('datebook')
+    })
+
+    it('should return the window host in the browser context', () => {
+      const host = 'mydomain.com'
+
+      Object.defineProperty(global, 'window', {
+        value: {
+          location: { host }
+        },
+        writable: true
+      })
+
+      expect(getProdId()).toEqual(host)
+    })
+  })
+
   describe('getRrule()', () => {
     it('should transform the object into an ICS param string', () => {
       const recurrence = {

src/utils/ics.js

@@ -55,6 +55,17 @@ export const getUid = () => {
   return Math.random().toString(36).substr(2)
 }
 
+/**
+ * Returns the hostname for usage in `PRODID`. Returns `datebook` in Node.js.
+ *
+ * @returns {String}
+ */
+export const getProdId = () => {
+  return typeof window !== 'undefined'
+    ? window.location.host
+    : 'datebook'
+}
+
 /**
  * Converts the given recurrence options to RFC????
  *
@@ -105,4 +116,4 @@ export const download = (title, data) => {
   } else {
     FileSaver.saveAs(getBlob(data), fileName)
   }
-}
+}

webpack.config.js

@@ -16,6 +16,7 @@ module.exports = {
     library: 'datebook',      
     libraryTarget: 'umd'
   },
+  target: 'node',
   resolve: {
     extensions: ['.js'],
   },