Extract classes, events and gearTypes into constants file.

common/script/content/constants.js

@@ -0,0 +1,36 @@
+/* eslint-disable key-spacing */
+
+export const CLASSES = [
+  'warrior',
+  'rogue',
+  'healer',
+  'wizard',
+];
+
+// IMPORTANT: The end date should be one to two days AFTER the actual end of
+// the event, to allow people in different timezones to still buy the
+// event gear up until at least the actual end of the event.
+
+export const EVENTS = {
+  winter:     { start: '2013-12-31', end: '2014-02-01' },
+  birthday:   { start: '2013-01-30', end: '2014-02-01' },
+  spring:     { start: '2014-03-21', end: '2014-05-01' },
+  summer:     { start: '2014-06-20', end: '2014-08-01' },
+  gaymerx:    { start: '2014-07-02', end: '2014-08-01' },
+  fall:       { start: '2014-09-21', end: '2014-11-01' },
+  winter2015: { start: '2014-12-21', end: '2015-02-02' },
+  spring2015: { start: '2015-03-20', end: '2015-05-02' },
+  summer2015: { start: '2015-06-20', end: '2015-08-02' },
+  fall2015:   { start: '2015-09-21', end: '2015-11-01' },
+};
+
+export const GEAR_TYPES = [
+  'weapon',
+  'armor',
+  'head',
+  'shield',
+  'body',
+  'back',
+  'headAccessory',
+  'eyewear',
+];