for (final todo in todos.data.value) TodoItem(todo: todo)
とかくと以下のエラー
error: This requires the 'control-flow-collections' experiment to be enabled. (experiment_not_enabled at [my_app] lib/main.dart:68)
analysis_options.yaml
analyzer: enable-experiment: - control-flow-collections
で解決できるらしいけどできないなw