storage is key-value storage and IndexedDB from scripts. It is a JavaScript module on the browser’s main thread. Import it by bare name or declare it in the host field of packages.json. The native engine rejects import storage at compile time, see the native engine.

The surface is local_get/set/remove/clear/keys, the same session_* surface, and IndexedDB (idb_open, idb_put, idb_get, idb_delete, idb_keys, idb_close). The KV handlers are synchronous, the IndexedDB handlers suspend like fetch. Values cross as JSON strings, encode with json.dumps and decode with json.loads. idb_open(name, version, schema) takes a JSON schema such as '{"stores":["items"]}' declaring the object stores to create on first open or a version bump.