From ab390305fba1d9bd99da46537f28763f7d5df8df Mon Sep 17 00:00:00 2001
From: Jonathan Haines <jonno.haines@gmail.com>
Date: Mon, 9 Jun 2025 19:16:01 +1000
Subject: [PATCH] refactor(graphql-server): enable isolated declarations
 (#1197)

---
 .changeset/huge-clocks-behave.md            | 5 +++++
 packages/graphql-server/src/index.ts        | 6 ++++--
 packages/graphql-server/tsconfig.build.json | 3 ++-
 3 files changed, 11 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/huge-clocks-behave.md

diff --git a/.changeset/huge-clocks-behave.md b/.changeset/huge-clocks-behave.md
new file mode 100644
index 00000000..f203f6a6
--- /dev/null
+++ b/.changeset/huge-clocks-behave.md
@@ -0,0 +1,5 @@
+---
+'@hono/graphql-server': patch
+---
+
+Add explicit `Response` return type
diff --git a/packages/graphql-server/src/index.ts b/packages/graphql-server/src/index.ts
index b91911c8..3e14dd7c 100644
--- a/packages/graphql-server/src/index.ts
+++ b/packages/graphql-server/src/index.ts
@@ -216,7 +216,9 @@ export const getGraphQLParams = async (request: Request): Promise<GraphQLParams>
 export const errorMessages = (
   messages: string[],
   graphqlErrors?: readonly GraphQLError[] | readonly GraphQLFormattedError[]
-) => {
+): {
+  errors: readonly GraphQLError[] | readonly GraphQLFormattedError[]
+} => {
   if (graphqlErrors) {
     return {
       errors: graphqlErrors,
@@ -232,7 +234,7 @@ export const errorMessages = (
   }
 }
 
-export const respondWithGraphiQL = (c: Context) => {
+export const respondWithGraphiQL = (c: Context): Response => {
   // https://github.com/graphql/graphiql/blob/03171d5614c61fb345763636d120da2b536d54a0/examples/graphiql-cdn/index.html
   return c.html(`<!--
  *  Copyright (c) 2021 GraphQL Contributors
diff --git a/packages/graphql-server/tsconfig.build.json b/packages/graphql-server/tsconfig.build.json
index ccc2f65a..a82a1266 100644
--- a/packages/graphql-server/tsconfig.build.json
+++ b/packages/graphql-server/tsconfig.build.json
@@ -4,7 +4,8 @@
     "rootDir": "src",
     "outDir": "dist",
     "tsBuildInfoFile": "dist/tsconfig.build.tsbuildinfo",
-    "emitDeclarationOnly": false
+    "emitDeclarationOnly": false,
+    "isolatedDeclarations": true
   },
   "include": ["src/**/*.ts"],
   "exclude": ["**/*.test.ts"],