1 files changed, 14 insertions, 0 deletions
diff --git a/crates/shirabe/src/event_dispatcher/event_subscriber_interface.rs b/crates/shirabe/src/event_dispatcher/event_subscriber_interface.rs
index 70c689c..41d723d 100644
--- a/crates/shirabe/src/event_dispatcher/event_subscriber_interface.rs
+++ b/crates/shirabe/src/event_dispatcher/event_subscriber_interface.rs
@@ -1 +1,15 @@
 //! ref: composer/src/Composer/EventDispatcher/EventSubscriberInterface.php
+
+use indexmap::IndexMap;
+
+/// Represents one event's subscriber info: method name only, method+priority, or multiple handlers.
+pub enum SubscribedEventEntry {
+    Method(String),
+    MethodWithPriority(String, Option<i64>),
+    Methods(Vec<(String, Option<i64>)>),
+}
+
+pub trait EventSubscriberInterface {
+    /// Returns an array of event names this subscriber wants to listen to.
+    fn get_subscribed_events() -> IndexMap<String, SubscribedEventEntry>;
+}