diff --git a/src/cli/export.ts b/src/cli/export.ts
index 95a155d..9618c70 100644
--- a/src/cli/export.ts
+++ b/src/cli/export.ts
@@ -25,6 +25,10 @@ export async function exporter(export_dir: string, { basepath = '' }) {
 		sander.copyFileSync(build_dir, 'service-worker.js').to(export_dir, 'service-worker.js');
 	}
 
+	if (sander.existsSync(build_dir, 'service-worker.js.map')) {
+		sander.copyFileSync(build_dir, 'service-worker.js.map').to(export_dir, 'service-worker.js.map');
+	}
+
 	const port = await ports.find(3000);
 
 	const origin = `http://localhost:${port}`;
diff --git a/src/middleware.ts b/src/middleware.ts
index 3fc9da0..8f0f06e 100644
--- a/src/middleware.ts
+++ b/src/middleware.ts
@@ -77,6 +77,11 @@ export default function middleware({ routes, store }: {
 			cache_control: 'max-age=600'
 		}),
 
+		fs.existsSync(path.join(output, 'service-worker.js.map')) && serve({
+			pathname: '/service-worker.js.map',
+			cache_control: 'max-age=600'
+		}),
+
 		serve({
 			prefix: '/client/',
 			cache_control: 'max-age=31536000'
diff --git a/src/middleware/mime-types.md b/src/middleware/mime-types.md
index 06d6c9c..f0ec9dc 100644
--- a/src/middleware/mime-types.md
+++ b/src/middleware/mime-types.md
@@ -29,7 +29,7 @@ application/java-archive			jar
 application/java-serialized-object		ser
 application/java-vm				class
 application/javascript				js
-application/json				json
+application/json				json map
 application/jsonml+json				jsonml
 application/lost+xml				lostxml
 application/mac-binhex40			hqx