Initial files

module.json

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+{
+  "id": "hp-roller",
+  "title": "Hit Point Roller",
+  "description": "Rolls hit points, similar to Token Mold. But less clutter.",
+  "authors": [
+    {
+      "name": "Tomato"
+    }
+  ],
+  "version": "1.0.0",
+  "compatibility": {
+    "minimum": "11",
+    "verified": "11.301"
+  },
+  "scripts": [
+    "scripts/main.js"
+  ]
+}

scripts/main.js

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+var rollenabled = false;
+
+Hooks.on("init", () => {
+	game.settings.register("hp-roller", "rolltochat", {
+		name: "Display roll to chat",
+		hint: "Displays the rolls in chat as a GM roll",
+		scope: "client",
+		config: true,
+		type: Boolean,
+		default: false
+	});
+});
+
+Hooks.on("getSceneControlButtons", (controls) => {
+	const hproll = {
+      icon: "fas fa-heart-circle-bolt",
+      name: "hproll",
+      title: "Toggle HP Rolling",
+      toggle: true,
+      visible: true,
+      onClick: toggled => rollenabled = toggled
+    };
+    controls.find((control) => control.name === "token").tools.push(hproll);
+});
+
+Hooks.on("preCreateToken", (token, data, options, userId) => {
+	const actor = game.actors.get(data.actorId);
+	if (rollenabled == true && data.actorLink == false && actor.type == "npc") {
+		const formula = getProperty(actor, "system.attributes.hp.formula");
+		if (formula) {
+			const roll = new Roll(formula.replace(" ", ""));
+			roll.roll({async: false});
+			const finalhp = Math.max(roll.total, 1);
+			if (game.settings.get("hp-roller", "rolltochat") == true) {
+				roll.toMessage({rollMode: "gmroll", flavor: data.name + " rolls for hp!"});
+			}
+			token.delta.updateSource({"system.attributes.hp.value" : finalhp, "system.attributes.hp.max": finalhp});
+		} else {
+			ui.notifications.warn("No HP formula set.");
+		}
+	}
+});