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-rw-r--r--src/stdlib/io.ts2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/stdlib/io.ts b/src/stdlib/io.ts
index d8e3ed2..d256628 100644
--- a/src/stdlib/io.ts
+++ b/src/stdlib/io.ts
@@ -9,5 +9,7 @@ export interface Bind<_Eff extends Effect, _Fn extends Kind1> extends Effect { }
export interface Seq<_Effs extends Effect[]> extends Effect { }
+export interface Then<_Effs extends Effect[]> extends Effect { }
+
export interface DefineEffect<_Name extends string, _Func extends string> extends Effect { }