From 43e02763e07c7c15d0365bf1a401dfe2f2ae8a8a Mon Sep 17 00:00:00 2001
From: JaimeGensler <jaimegensler0@gmail.com>
Date: Sat, 17 Jun 2023 11:52:58 -0700
Subject: [PATCH] Add getComponentId

---
 .changeset/tiny-trains-thank.md |  5 +++++
 src/world/World.ts              | 14 ++++++++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 .changeset/tiny-trains-thank.md

diff --git a/.changeset/tiny-trains-thank.md b/.changeset/tiny-trains-thank.md
new file mode 100644
index 0000000..707547f
--- /dev/null
+++ b/.changeset/tiny-trains-thank.md
@@ -0,0 +1,5 @@
+---
+'thyseus': minor
+---
+
+Add World.prototype.getComponentId
diff --git a/src/world/World.ts b/src/world/World.ts
index ed69932..0cf287e 100644
--- a/src/world/World.ts
+++ b/src/world/World.ts
@@ -180,6 +180,20 @@ export class World {
 		this.entities.setRow(entityId, targetTable.length - 1);
 	}
 
+	/**
+	 * Gets the internal id for a component in this world.
+	 * May differ from world to world.
+	 * @param componentType The component type to get an id for.
+	 * @returns The numeric id of the component.
+	 */
+	getComponentId(componentType: Struct): number {
+		DEV_ASSERT(
+			this.components.includes(componentType),
+			`Tried to get id of unregistered component "${componentType.name}"`,
+		);
+		return this.components.indexOf(componentType);
+	}
+
 	#getTable(archetype: bigint): Table {
 		let table = this.#archetypeToTable.get(archetype);
 		if (table) {