Add missing parameter types

src/__tests__/http-test.js

@@ -19,11 +19,13 @@ import {
  GraphQLNonNull,
  GraphQLString,
  GraphQLError,
+ ValidationContext,
  BREAK,
  Source,
  validate,
  execute,
  parse,
+ type ASTVisitor,
 } from 'graphql';
 
 import { graphqlHTTP } from '../index';
@@ -1962,7 +1964,9 @@ function runTests(server) {
  });
 
  describe('Custom validation rules', () => {
- const AlwaysInvalidRule = function (context) {
+ const AlwaysInvalidRule = function (
+ context: ValidationContext,
+ ): ASTVisitor {
  return {
  enter() {
  context.reportError(

src/index.js

@@ -194,7 +194,7 @@ export function graphqlHTTP(options: Options): Middleware {
  return async function graphqlMiddleware(
  request: $Request,
  response: $Response,
- ) {
+ ): Promise<void> {
  // Higher scoped variables are referred to at various stages in the asynchronous state machine below.
  let params: GraphQLParams;
  let showGraphiQL = false;

src/parseBody.js

@@ -1,7 +1,7 @@
 // @flow strict
 
 import { type IncomingMessage } from 'http';
-import zlib from 'zlib';
+import zlib, { type Inflate, type Gunzip } from 'zlib';
 import querystring from 'querystring';
 
 import getBody from 'raw-body';
@@ -76,7 +76,11 @@ export async function parseBody(
 const jsonObjRegex = /^[ \t\n\r]*\{/;
 
 // Read and parse a request body.
-async function readBody(req, typeInfo) {
+async function readBody(
+ req: $Request,
+ // TODO: Import the appropriate TS type and use it here instead
+ typeInfo: {| type: string, parameters: { [param: string]: string, ... } |},
+): Promise<string> {
  const charset = (typeInfo.parameters.charset ?? 'utf-8').toLowerCase();
 
  // Assert charset encoding per JSON RFC 7159 sec 8.1
@@ -105,7 +109,10 @@ async function readBody(req, typeInfo) {
 }
 
 // Return a decompressed stream, given an encoding.
-function decompressed(req, encoding) {
+function decompressed(
+ req: $Request,
+ encoding: string,
+): $Request | Inflate | Gunzip {
  switch (encoding) {
  case 'identity':
  return req;

src/renderGraphiQL.js

@@ -19,7 +19,7 @@ export type GraphiQLOptions = {|
 |};
 
 // Ensures string values are safe to be used within a <script> tag.
-function safeSerialize(data) {
+function safeSerialize(data: ?string): string {
  return data != null
  ? JSON.stringify(data).replace(/\//g, '\\/')
  : 'undefined';