From d4bdb400a0e12b615c4b2bd6d138d4723cf24231 Mon Sep 17 00:00:00 2001
From: David Philipson <david.philipson@gmail.com>
Date: Wed, 21 Jun 2017 18:27:55 -0700
Subject: [PATCH] More general Transducer definition

---
 types/transducers-js/index.d.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/types/transducers-js/index.d.ts b/types/transducers-js/index.d.ts
index 66073d1cbc..83dbbe1573 100644
--- a/types/transducers-js/index.d.ts
+++ b/types/transducers-js/index.d.ts
@@ -11,7 +11,12 @@ export interface Reduced<TResult> {
 
 export type Reducer<TResult, TInput> = (result: TResult, input: TInput) => TResult;
 
-export type Transducer<TInput, TOutput> = <TResult>(xf: Transformer<TResult, TOutput>) => Transformer<TResult, TInput>;
+// Common case: Transducer<TInput, TOutput> =
+//   Transformer<TResult, TOutput> => Transformer<TResult, TInput>.
+export type Transducer<TInput, TOutput> =
+    <TResult, TCompleteResult>(
+        xf: CompletingTransformer<TResult, TCompleteResult, TOutput>
+    ) => CompletingTransformer<TResult, TCompleteResult, TInput>;
 
 export interface CompletingTransformer <TResult, TCompleteResult, TInput> {
   ['@@transducer/init'](): TResult | void;