1 files changed, 6 insertions, 3 deletions
diff --git a/u/fn/callable.ts b/u/fn/callable.ts
index a087928..fc6ea81 100644
--- a/u/fn/callable.ts
+++ b/u/fn/callable.ts
@@ -7,9 +7,6 @@ export interface Supplier<T> extends Callable<T, undefined> {
   (): T;
 }
 
-export interface SideEffect<T> extends Callable<void, T> {
-}
-
 export interface Mapper<T, U> extends Callable<U, T> {
   (t: T): U;
 }
@@ -17,3 +14,9 @@ export interface Mapper<T, U> extends Callable<U, T> {
 export interface BiMapper<T, U, R> extends Callable {
   (t: T, u: U): R;
 }
+
+export interface SideEffect<T> extends Mapper<T, void> {
+}
+
+export interface BiSideEffect<T, U> extends BiMapper<T, U, void> {
+}