IntrospectionResultData: fix broken typing

AUTHORS

@@ -1,6 +1,7 @@
 Authors
 
 Abhi Aiyer <abhiaiyer91@gmail.com>
+Avindra Goolcharan <aavindraa@gmail.com>
 Ben James <benhjames@sky.com>
 Brady Whitten <bwhitten518@gmail.com>
 Brett Jurgens <brett@brettjurgens.com>
@@ -68,4 +69,4 @@ Andrew E. Rhyne <rhyneandrew@gmail.com>
 Miroslav Simulcik <simulcik.miro@gmail.com>
 Stephen Potter <me@stevepotter.me>
 Michaël De Boey <info@michaeldeboey.be>
-Andreas Bergenwall <abergenw@gmail.com>
+Andreas Bergenwall <abergenw@gmail.com>

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Change log
 
 ### vNEXT
+- Fix: broken edge case when setting up fragment matching with Typescript by fixing types on `IntrospectionResultData` [PR #1763](https://github.com/apollographql/apollo-client/pull/1763)
 
 ### v1.4.0
 - Feature: Add `operationName` to Redux actions where possible [PR #1676](https://github.com/apollographql/apollo-client/pull/1676)

src/data/fragmentMatcher.ts

@@ -25,9 +25,9 @@ export type IntrospectionResultData = {
     types: [{
       kind: string,
       name: string,
-      possibleTypes: [{
+      possibleTypes: {
         name: string,
-      }],
+      }[],
     }],
   },
 };