feat: can join game midway

Author: r2dev2

src/__tests__/js/networking.js

@@ -289,5 +289,23 @@ describe('networking as a hivemind', () => {
         lastUpdate.msg.users.every((u) => u.progress === null && !u.solved)
       ).toBe(true);
     });
+
+    it('sends the game problem if it exists', () => {
+      stores.gameProblem.set(testProblem);
+
+      // clear messages
+      messagesTo.splice(0, messagesTo.length);
+
+      // have person connect
+      networking.onData(testId1)({
+        type: Messages.INIT_STATE,
+        name: testName,
+      });
+
+      expect(messagesTo.map(m => m.msg)).toContainEqual({
+        type: Messages.NEW_PROBLEM,
+        problem: testProblem
+      });
+    })
   });
 });

src/js/networking.js

@@ -57,6 +57,12 @@ const initializeRemotePlayer = (id, data) => {
       solved: false,
     },
   ]);
+  const $problem = get(gameProblem);
+  if (!connections.has(id) || $problem === null) return;
+  connections.get(id)?.send({
+    type: Messages.NEW_PROBLEM,
+    problem: $problem
+  });
 };
 
 /** @type {DataResponder<NEW_PROB_MSG>} */