split some store func and add test

src/shared/resolveRef.js

@@ -0,0 +1,34 @@
+/**
+ * Generic resolver for user/world/group references.
+ * Normalises the input, optionally fetches the display name if missing.
+ *
+ * @param {string|object|null|undefined} input
+ * @param {object} opts
+ * @param {object} opts.emptyDefault - value to return when input is falsy
+ * @param {string} opts.idAlias - alternative id key on input (e.g. 'userId')
+ * @param {string} opts.nameKey - name property key (e.g. 'displayName' or 'name')
+ * @param {(id: string) => Promise<{ref: object}>} opts.fetchFn - fetch function
+ * @returns {Promise<object>}
+ */
+async function resolveRef(input, { emptyDefault, idAlias, nameKey, fetchFn }) {
+    if (!input) {
+        return emptyDefault;
+    }
+    if (typeof input === 'string') {
+        input = { id: input, [nameKey]: '' };
+    }
+    const id = input.id || input[idAlias] || '';
+    let name = input[nameKey] || '';
+    if (id && !name) {
+        try {
+            const args = await fetchFn(id);
+            name = args?.ref?.[nameKey] || name;
+            return { ...args.ref, id, [nameKey]: name };
+        } catch {
+            return { ...input, id, [nameKey]: name };
+        }
+    }
+    return { ...input, id, [nameKey]: name };
+}
+
+export { resolveRef };