diff --git a/src/utils/ensure.ts b/src/utils/ensure.ts
new file mode 100644
index 0000000..e2b9459
--- /dev/null
+++ b/src/utils/ensure.ts
@@ -0,0 +1,21 @@
+export const DEFAULT_MESSAGE = 'An error occurred';
+
+function ensureError(err?: any): Error {
+  if (err instanceof Error) return err;
+  return err && typeof err === 'object' && err.hasOwnProperty('message')
+    ? Error(err.message)
+    : Error(typeof err === 'string' ? err : DEFAULT_MESSAGE);
+}
+
+async function ensureRejection<T>(fn: () => Promise<T>): Promise<T> {
+  try {
+    return await fn();
+  } catch (err) {
+    throw ensureError(err);
+  }
+}
+
+export default {
+  error: ensureError,
+  rejection: ensureRejection
+};