document shard

src/sharding/Shard.js

@@ -6,8 +6,20 @@ const path = require('path');
  */
 class Shard {
   constructor(manager, id) {
+    /**
+     * The manager of the spawned shard
+     * @type {ShardingManager}
+     */
     this.manager = manager;
+    /**
+     * The shard id
+     * @type {number}
+     */
     this.id = id;
+    /**
+     * The process of the shard
+     * @type {process}
+     */
     this.process = childProcess.fork(path.resolve(this.manager.file), [id, this.manager.shards.size]);
   }
 }