added shared health

.gitignore

@@ -1,4 +1,4 @@
-manifest.json
+/manifest.json
 package.json
 package-lock.json
 node_modules

mc-server/shared-health/main.js

@@ -0,0 +1,38 @@
+import { system, world } from "@minecraft/server";
+
+let lastHealth = 20;
+
+world.afterEvents.playerSpawn.subscribe((data) => {
+    data.player.getComponent("health").setCurrentValue(lastHealth);
+    world.getDimension("overworld").runCommandAsync("gamerule naturalregeneration false");
+    world.getDimension("overworld").runCommandAsync("gamerule doimmediaterespawn true");
+});
+
+world.afterEvents.entityHealthChanged.subscribe(
+    (data) => {
+        if (data.entity.getComponent("health").currentValue === lastHealth) return;
+        const players = world.getAllPlayers();
+        for (let i = 0; i < players.length; i++) {
+            players[i].getComponent("health").setCurrentValue(data.newValue);
+            lastHealth = data.newValue;
+        }
+    },
+    { entityTypes: ["minecraft:player"] }
+);
+
+world.afterEvents.entityDie.subscribe(
+    (data) => {
+        lastHealth = 20;
+        data.deadEntity.getComponent("health").setCurrentValue(20);
+    },
+    { entityTypes: ["minecraft:player"] }
+);
+
+system.runInterval(() => {
+    if (lastHealth > 19) return;
+    lastHealth++;
+    const players = world.getAllPlayers();
+    for (let i = 0; i < players.length; i++) {
+        players[i].getComponent("health").setCurrentValue(lastHealth);
+    }
+}, 60);