| # Package `js_runtime`: | |
| This package contains code that is shared between the dart2js compiler and the | |
| dart2js runtime libraries. | |
| *Important*: all code under the `lib/synced/` must be kept in sync with the | |
| runtime at all times (in `sdk/lib/_internal/js_runtime/lib/synced`). The | |
| `test/in_sync_test.dart` test verifies this. | |