partial: leverage last optimization

gcanti · Dec 12, 2017 · 37c74a5 · 37c74a5
1 parent 2a84362
commit 37c74a5
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Showing 2 changed files with 3 additions and 3 deletions.
diff --git a/src/index.ts b/src/index.ts
@@ -489,7 +489,7 @@ export const partial = <P extends Props>(
 ): PartialType<P, PartialOf<P>> => {
   const partials: Props = {}
   for (let k in props) {
-    partials[k] = union([props[k], undefinedType])
+    partials[k] = union([undefinedType, props[k]])
   }
   const partial = type(partials)
   return new PartialType(

diff --git a/test/partial.ts b/test/partial.ts
@@ -36,8 +36,8 @@ describe('partial', () => {
   it('should fail validating an invalid value', () => {
     const T = t.partial({ a: t.number })
     assertFailure(t.validate({ a: 's' }, T), [
-      'Invalid value "s" supplied to : PartialType<{ a: number }>/a: (number | undefined)/0: number',
-      'Invalid value "s" supplied to : PartialType<{ a: number }>/a: (number | undefined)/1: undefined'
+      'Invalid value "s" supplied to : PartialType<{ a: number }>/a: (undefined | number)/0: undefined',
+      'Invalid value "s" supplied to : PartialType<{ a: number }>/a: (undefined | number)/1: number'
     ])
   })