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-rw-r--r--stdlib/sys.ts3
1 files changed, 3 insertions, 0 deletions
diff --git a/stdlib/sys.ts b/stdlib/sys.ts
index e170c6c..68f713d 100644
--- a/stdlib/sys.ts
+++ b/stdlib/sys.ts
@@ -8,3 +8,6 @@ export interface JsExpr<_Expr extends string> extends Effect<any> {}
export interface DefineEffect<_Name extends string, _Func extends string>
extends Effect {}
+
+export interface Exit<_ extends number | undefined = undefined> extends Effect {}
+