feat(hooks): Hook Session Lifecycle & Compression Integration (#14151)

packages/core/src/hooks/hookEventHandler.ts

@@ -220,6 +220,57 @@ function validateNotificationInput(input: Record<string, unknown>): {
   };
 }
 
+/**
+ * Validates SessionStart input fields
+ */
+function validateSessionStartInput(input: Record<string, unknown>): {
+  source: SessionStartSource;
+} {
+  const source = input['source'];
+  if (typeof source !== 'string') {
+    throw new Error(
+      'Invalid input for SessionStart hook event: source must be a string',
+    );
+  }
+  return {
+    source: source as SessionStartSource,
+  };
+}
+
+/**
+ * Validates SessionEnd input fields
+ */
+function validateSessionEndInput(input: Record<string, unknown>): {
+  reason: SessionEndReason;
+} {
+  const reason = input['reason'];
+  if (typeof reason !== 'string') {
+    throw new Error(
+      'Invalid input for SessionEnd hook event: reason must be a string',
+    );
+  }
+  return {
+    reason: reason as SessionEndReason,
+  };
+}
+
+/**
+ * Validates PreCompress input fields
+ */
+function validatePreCompressInput(input: Record<string, unknown>): {
+  trigger: PreCompressTrigger;
+} {
+  const trigger = input['trigger'];
+  if (typeof trigger !== 'string') {
+    throw new Error(
+      'Invalid input for PreCompress hook event: trigger must be a string',
+    );
+  }
+  return {
+    trigger: trigger as PreCompressTrigger,
+  };
+}
+
 /**
  * Hook event bus that coordinates hook execution across the system
  */
@@ -704,6 +755,21 @@ export class HookEventHandler {
           );
           break;
         }
+        case HookEventName.SessionStart: {
+          const { source } = validateSessionStartInput(enrichedInput);
+          result = await this.fireSessionStartEvent(source);
+          break;
+        }
+        case HookEventName.SessionEnd: {
+          const { reason } = validateSessionEndInput(enrichedInput);
+          result = await this.fireSessionEndEvent(reason);
+          break;
+        }
+        case HookEventName.PreCompress: {
+          const { trigger } = validatePreCompressInput(enrichedInput);
+          result = await this.firePreCompressEvent(trigger);
+          break;
+        }
         default:
           throw new Error(`Unsupported hook event: ${request.eventName}`);
       }