fix: allow union undefined union to be passed in .add

jecs.d.ts

@@ -120,7 +120,7 @@ export class World {
 	 * @returns An entity (Tag) with no data.
 	 */
 	entity(): Tag;
-	entity(id: number): Tag;
+	entity<T extends Entity>(id: T): InferComponent<T> extends undefined ? Tag : T;
 
 	/**
 	 * Creates a new entity in the first 256 IDs, typically used for static
@@ -149,7 +149,7 @@ export class World {
 	 * @param entity The target entity.
 	 * @param component The component (or tag) to add.
 	 */
-	add(entity: Entity, component: Id): void;
+	add<C>(entity: Entity, component: undefined extends InferComponent<C> ? C : Id<undefined>): void;
 
 	/**
 	 * Assigns a value to a component on the given entity.

package-lock.json

@@ -1,12 +1,12 @@
 {
 	"name": "@rbxts/jecs",
-	"version": "0.6.1",
+	"version": "0.6.0",
 	"lockfileVersion": 3,
 	"requires": true,
 	"packages": {
 		"": {
 			"name": "@rbxts/jecs",
-			"version": "0.6.1",
+			"version": "0.6.0",
 			"license": "MIT",
 			"devDependencies": {
 				"@rbxts/compiler-types": "^2.3.0-types.1",

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "@rbxts/jecs",
-	"version": "0.6.1",
+	"version": "0.6.0",
 	"description": "Stupidly fast Entity Component System",
 	"main": "jecs.luau",
 	"repository": {