Define collectSeedReferences, which returns all seedReferences in a g…

…iven ExpandedSeedData.

This will be useful for validation.

Part of #39.

src/seed.ts

@@ -14,7 +14,8 @@ import  {
 	nestedSeedDataObject,
 	SeedDataObject,
 	nestedSeedDataArray,
-	SeedDataArray
+	SeedDataArray,
+	seedReference
 } from './types.js';
 
 import {
@@ -98,6 +99,18 @@ export const expandSeedPacket = (packet : SeedPacket) : ExpandedSeedPacket => {
 	return result;
 };
 
+//TODO: unexport
+export const collectSeedReferences = (data : ExpandedSeedData) : SeedReference[] => {
+	const result : SeedReference[] = [];
+	for (const value of Object.values(data)) {
+		const parsed = seedReference.safeParse(value);
+		if(parsed.success) {
+			result.push(parsed.data);
+		}
+	}
+	return result;
+};
+
 export class Seed<D extends ExpandedSeedData = ExpandedSeedData> {
 
 	_garden : Garden;