From 6310583e0b86ec36c4c4fd763dae57071f474516 Mon Sep 17 00:00:00 2001
From: Yann Renaudin <renaudin.yann@gmail.com>
Date: Mon, 11 Nov 2019 18:29:29 -0500
Subject: [PATCH 1/2] fix: use expression instead of interface to avoid
 typescript widening type

---
 src/types.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/types.ts b/src/types.ts
index 7227386..09cb5a4 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -35,7 +35,7 @@ export type StrictSchema<Target = any, Source = any> = {
   /** `destinationProperty` is the name of the property of the target object you want to produce */
   [destinationProperty in keyof Target]:
     | ActionString<Source>
-    | ActionFunction<Target, Source, Target[destinationProperty]>
+    | { (iteratee: Source, source: Source[], target: Target[destinationProperty]): Target[destinationProperty] }
     | ActionAggregator<Source>
     | ActionSelector<Source, Target>
     | StrictSchema<Target[destinationProperty], Source>;
@@ -44,7 +44,7 @@ export type Schema<Target = any, Source = any> = {
   /** `destinationProperty` is the name of the property of the target object you want to produce */
   [destinationProperty in keyof Target]?:
     | ActionString<Source>
-    | ActionFunction<Target, Source, Target[destinationProperty]>
+    | { (iteratee: Source, source: Source[], target: Target[destinationProperty]): Target[destinationProperty] }
     | ActionAggregator<Source>
     | ActionSelector<Source, Target>
     | Schema<Target[destinationProperty], Source>;

From 922f487eb73b4a00b4c386a585a38209e8f99fbd Mon Sep 17 00:00:00 2001
From: Yann Renaudin <renaudin.yann@gmail.com>
Date: Mon, 11 Nov 2019 18:30:04 -0500
Subject: [PATCH 2/2] test: add typescript test to ensure union type as target
 is allowed

---
 src/typescript.spec.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/typescript.spec.ts b/src/typescript.spec.ts
index daccd97..129eac4 100644
--- a/src/typescript.spec.ts
+++ b/src/typescript.spec.ts
@@ -1,4 +1,4 @@
-import Morphism, { morphism, StrictSchema, Schema } from './morphism';
+import Morphism, { morphism, StrictSchema, Schema, createSchema } from './morphism';
 
 describe('Typescript', () => {
   describe('Registry Type Checking', () => {
@@ -184,6 +184,14 @@ describe('Typescript', () => {
         expect(item).toEqual(expected[idx]);
       });
     });
+
+    it('should accept union types as Target', () => {
+      const schema = createSchema<{ a: string } | { a: string; b: string }, { c: string }>({
+        a: ({ c }) => c
+      });
+
+      expect(morphism(schema, { c: 'result' }).a).toEqual('result');
+    });
   });
 
   describe('Morphism Function Type Checking', () => {