support segment

package.json

@@ -68,6 +68,6 @@
     "testEnvironment": "node"
   },
   "peerDependencies": {
-    "koishi": "^4.8.7"
+    "koishi": "^4.9.1"
   }
 }

src/def/interfaces.ts

-import { Argv, Command, Context, Dict, I18n } from 'koishi';
+import { Argv, Command, Context, Dict, I18n, segment } from 'koishi';
 import { CanBeObserved } from '../utility/rxjs-session';
 
 type CommandReg<A extends any[] = any[], R = any> = (
@@ -85,4 +85,4 @@ export interface CommandOptionConfig {
   config?: CommandOptionConfigWithDescription;
 }
 
-export type CommandReturnType = CanBeObserved<string | void>;
+export type CommandReturnType = CanBeObserved<string | void | segment>;

src/utility/rxjs-session.ts

-import { Awaitable, Session } from 'koishi';
+import { Awaitable, Session, segment } from 'koishi';
 import { isObservable, Observable } from 'rxjs';
 
 export type CanBeObserved<T> = Awaitable<T | Observable<T>>;
 
 export async function sessionRxToPromise(
   session: Session,
-  obs: CanBeObserved<string | void>,
+  obs: CanBeObserved<string | void | segment>,
 ) {
   const obsAwaited = await obs;
   if (!isObservable(obsAwaited)) {