replace object.assign by util.assign to make it work in IE

CHANGELOG.md

@@ -3,6 +3,7 @@
 ### vNEXT
 - Feature+Fix: Introduce "standby" fetchPolicy to mark queries that are not currently active, but should be available for refetchQueries and updateQueries [PR #1636](https://github.com/apollographql/apollo-client/pull/1636)
 - Feature: Print a warning when heuristically matching fragments on interface/union [PR #1635](https://github.com/apollographql/apollo-client/pull/1635)
+- Fix: Replace usage of Object.assign with util.assign to make it work in IE, make util.assign work with undefined and null sources as Object.assign does [PR #1643](https://github.com/apollographql/apollo-client/pull/1643)
 
 ### 1.1.1
 - Fix: Remove ability to set default fetchPolicy, which broke polling queries [PR #1630](https://github.com/apollographql/apollo-client/pull/1630)

src/core/QueryManager.ts

@@ -9,6 +9,7 @@ import {
 } from '../transport/Deduplicator';
 
 import { isEqual } from '../util/isEqual';
+import { assign } from '../util/assign';
 
 import {
   QueryListener,
@@ -258,7 +259,7 @@ export class QueryManager {
       mutation = addTypenameToDocument(mutation);
     }
 
-    variables = Object.assign(getDefaultValues(getMutationDefinition(mutation)), variables);
+    variables = assign({}, getDefaultValues(getMutationDefinition(mutation)), variables);
 
     const mutationString = print(mutation);
     const request = {
@@ -647,7 +648,7 @@ export class QueryManager {
     if (queryDefinition.variableDefinitions && queryDefinition.variableDefinitions.length) {
       const defaultValues = getDefaultValues(queryDefinition);
 
-      options.variables = Object.assign(defaultValues, options.variables);
+      options.variables = assign({}, defaultValues, options.variables);
     }
 
     if (typeof options.notifyOnNetworkStatusChange === 'undefined') {
@@ -844,7 +845,7 @@ export class QueryManager {
       transformedDoc = addTypenameToDocument(transformedDoc);
     }
 
-    const variables = Object.assign(getDefaultValues(getOperationDefinition(query)), options.variables);
+    const variables = assign({}, getDefaultValues(getOperationDefinition(query)), options.variables);
 
     const request: Request = {
       query: transformedDoc,

src/queries/getFromAST.ts

@@ -10,6 +10,8 @@ import {
   valueToObjectRepresentation,
 } from '../data/storeUtils';
 
+import { assign } from '../util/assign';
+
 export function getMutationDefinition(doc: DocumentNode): OperationDefinitionNode {
   checkDocument(doc);
 
@@ -250,7 +252,7 @@ export function getDefaultValues(definition: OperationDefinitionNode): { [key: s
         return defaultValueObj;
       });
 
-    return Object.assign({}, ...defaultValues);
+    return assign({}, ...defaultValues);
   }
 
   return {};

src/util/assign.ts

@@ -13,8 +13,14 @@ export function assign (
   target: { [key: string]: any },
   ...sources: Array<{ [key: string]: any }>,
 ): { [key: string]: any } {
-  sources.forEach(source => Object.keys(source).forEach(key => {
-    target[key] = source[key];
-  }));
+  sources.forEach(source => {
+
+      if (typeof(source) === 'undefined' || source === null) {
+        return;
+      }
+      Object.keys(source).forEach(key => {
+        target[key] = source[key];
+      });
+  });
   return target;
 }