Use invariant.{warn,error} instead of console.{warn,error}.

package.json

@@ -34,12 +34,12 @@
     {
       "name": "apollo-client",
       "path": "./packages/apollo-client/lib/bundle.cjs.min.js",
-      "maxSize": "10.6 kB"
+      "maxSize": "10.5 kB"
     },
     {
       "name": "apollo-utilities",
       "path": "./packages/apollo-utilities/lib/bundle.cjs.min.js",
-      "maxSize": "4.2 kB"
+      "maxSize": "4.1 kB"
     }
   ],
   "lint-staged": {

packages/apollo-client/src/core/ObservableQuery.ts

@@ -339,7 +339,8 @@ export class ObservableQuery<
       FetchMoreOptions<TData, TVariables>,
   ): Promise<ApolloQueryResult<TData>> {
     // early return if no update Query
-    invariant(fetchMoreOptions.updateQuery,
+    invariant(
+      fetchMoreOptions.updateQuery,
       'updateQuery option is required. This function defines how to update the query data with the new results.',
     );
 
@@ -417,7 +418,7 @@ export class ObservableQuery<
             options.onError(err);
             return;
           }
-          console.error('Unhandled GraphQL subscription error', err);
+          invariant.error('Unhandled GraphQL subscription error', err);
         },
       });
 
@@ -577,7 +578,7 @@ export class ObservableQuery<
       (observer as any)._subscription._observer.error = (
         error: ApolloError,
       ) => {
-        console.error('Unhandled error', error.message, error.stack);
+        invariant.error('Unhandled error', error.message, error.stack);
       };
     }
 

packages/apollo-utilities/src/transform.ts

@@ -23,6 +23,7 @@ import {
   getMainDefinition,
 } from './getFromAST';
 import { filterInPlace } from './util/filterInPlace';
+import { invariant } from 'ts-invariant';
 
 export type RemoveNodeConfig<N> = {
   name?: string;
@@ -254,7 +255,7 @@ const connectionRemoveConfig = {
         !directive.arguments ||
         !directive.arguments.some(arg => arg.name.value === 'key')
       ) {
-        console.warn(
+        invariant.warn(
           'Removing an @connection directive even though it does not have a key. ' +
             'You may want to use the key parameter to specify a store key.',
         );