- Add spawn rule internal (#268)

Author: Xterionix

src/internal/behavior-pack/index.ts

@@ -9,4 +9,5 @@ export * from "./item";
 export * from "./feature";
 export * from "./feature_rule";
 export * from './item_catalog';
-export * from './recipe';
+export * from './recipe';
+export * from './spawn_rule';

src/internal/behavior-pack/spawn_rule.ts

@@ -0,0 +1,38 @@
+import { ComponentContainer } from 'bc-minecraft-bedrock-types/lib/minecraft/components';
+import { FormatVersion } from "../types/format-version";
+
+/** */
+export interface SpawnRule extends Readonly<FormatVersion> {
+  /** */
+  format_version: string;
+  /** */
+  "minecraft:spawn_rules": {
+    description: {
+      identifier: string
+      population_control: string
+    },
+    conditions: ComponentContainer[]
+  };
+}
+
+/**
+ *
+ */
+export namespace SpawnRule {
+  /**
+   *
+   * @param value
+   * @returns
+   */
+  export function is(value: any): value is SpawnRule {
+    if (typeof value === "object" && typeof value.format_version === "string" && typeof value["minecraft:spawn_rules"] === "object") {
+      const desc = value["minecraft:spawn_rules"].description;
+
+      if (typeof desc === "object" && typeof desc.identifier === "string" && Array.isArray(value['minecraft:spawn_rules'].conditions)) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+}