Setup eslint and enforce rules

src/support/cache/MemoryCache.ts

@@ -1,4 +1,4 @@
-import {Cache, Collection, Awaitable} from "../../util"
+import {Cache, Collection, Awaitable} from '../../util'
 
 /**
  * An in-memory implementation of the Cache.
@@ -23,17 +23,19 @@ export class MemoryCache extends Cache {
             existing.value = value
             existing.expires = expires
         } else {
-            MemoryCache.cacheItems.push({ key, value, expires })
+            MemoryCache.cacheItems.push({ key,
+                value,
+                expires })
         }
     }
 
     public has(key: string): Awaitable<boolean> {
         const now = new Date()
-        return !!MemoryCache.cacheItems
+        return Boolean(MemoryCache.cacheItems
             .where('key', '=', key)
             .firstWhere(item => {
                 return !item.expires || now < item.expires
-            })
+            }))
     }
 
     public drop(key: string): Awaitable<void> {