Flow: Switch to explicit inexact objects

.flowconfig

@@ -37,7 +37,7 @@ deprecated-utility=error
 dynamic-export=off
 unsafe-getters-setters=error
 inexact-spread=error
-implicit-inexact-object=off
+implicit-inexact-object=error
 unnecessary-optional-chain=error
 unnecessary-invariant=error
 

src/__tests__/http-test.js

@@ -59,7 +59,7 @@ const TestSchema = new GraphQLSchema({
   }),
 });
 
-function urlString(urlParams?: ?{ [param: string]: mixed }) {
+function urlString(urlParams?: ?{ [param: string]: mixed, ... }) {
   let string = '/graphql';
   if (urlParams) {
     string += '?' + stringify(urlParams);

src/index.js

@@ -115,7 +115,7 @@ export type OptionsData = {|
    *
    * This function may be async.
    */
-  extensions?: ?(info: RequestInfo) => { [key: string]: mixed },
+  extensions?: ?(info: RequestInfo) => { [key: string]: mixed, ... },
 
   /**
    * A boolean to optionally enable GraphiQL mode.
@@ -150,7 +150,7 @@ export type RequestInfo = {|
   /**
    * The variable values used at runtime.
    */
-  variables: ?{ +[name: string]: mixed },
+  variables: ?{ +[name: string]: mixed, ... },
 
   /**
    * The (optional) operation name requested.
@@ -435,7 +435,7 @@ function graphqlHTTP(options: Options): Middleware {
 
 export type GraphQLParams = {|
   query: ?string,
-  variables: ?{ +[name: string]: mixed },
+  variables: ?{ +[name: string]: mixed, ... },
   operationName: ?string,
   raw: ?boolean,
 |};
@@ -456,8 +456,8 @@ async function getGraphQLParams(request: $Request): Promise<GraphQLParams> {
  * Helper function to get the GraphQL params from the request.
  */
 function parseGraphQLParams(
-  urlData: { [param: string]: mixed },
-  bodyData: { [param: string]: mixed },
+  urlData: { [param: string]: mixed, ... },
+  bodyData: { [param: string]: mixed, ... },
 ): GraphQLParams {
   // GraphQL Query string.
   let query = urlData.query || bodyData.query;

src/parseBody.js

@@ -14,7 +14,7 @@ import { type $Request } from 'express';
  */
 export async function parseBody(
   req: $Request,
-): Promise<{ [param: string]: mixed }> {
+): Promise<{ [param: string]: mixed, ... }> {
   const body = req.body;
 
   // If express has already parsed a body as a keyed object, use it.

src/renderGraphiQL.js

@@ -2,7 +2,7 @@
 
 type GraphiQLData = {|
   query: ?string,
-  variables: ?{ +[name: string]: mixed },
+  variables: ?{ +[name: string]: mixed, ... },
   operationName: ?string,
   result?: mixed,
   options: GraphiQLOptions,