1 files changed, 28 insertions, 0 deletions
diff --git a/packages/idb-bridge/src/util/getIndexKeys.ts b/packages/idb-bridge/src/util/getIndexKeys.ts
new file mode 100644
index 000000000..416cf9ea2
--- /dev/null
+++ b/packages/idb-bridge/src/util/getIndexKeys.ts
@@ -0,0 +1,28 @@
+import { Key, Value, KeyPath } from "./types";
+import extractKey from "./extractKey";
+import valueToKey from "./valueToKey";
+
+export function getIndexKeys(
+  value: Value,
+  keyPath: KeyPath,
+  multiEntry: boolean,
+): Key[] {
+  if (multiEntry && Array.isArray(keyPath)) {
+    const keys = [];
+    for (const subkeyPath of keyPath) {
+      const key = extractKey(subkeyPath, value);
+      try {
+        const k = valueToKey(key);
+        keys.push(k);
+      } catch {
+        // Ignore invalid subkeys
+      }
+    }
+    return keys;
+  } else {
+    let key = extractKey(keyPath, value);
+    return [valueToKey(key)];
+  }
+}
+
+export default getIndexKeys;