hey-api · mrlubos · Aug 21, 2025 · Aug 21, 2025 · Aug 21, 2025 · Aug 21, 2025
diff --git a/.changeset/grumpy-rings-decide.md b/.changeset/grumpy-rings-decide.md
@@ -0,0 +1,5 @@
+---
+"@hey-api/openapi-ts": patch
+---
+
+fix(parser): OpenAPI 3.1 parser handles multiple `type` values
diff --git a/packages/openapi-ts-tests/main/test/3.1.x.test.ts b/packages/openapi-ts-tests/main/test/3.1.x.test.ts
@@ -464,6 +464,14 @@ describe(`OpenAPI ${version}`, () => {
       description:
         'handles various enum names and values (TypeScript, preserve)',
     },
+    {
+      config: createConfig({
+        input: 'union-types.json',
+        output: 'union-types',
+        plugins: ['@hey-api/typescript'],
+      }),
+      description: 'handles union of primitive types',
+    },
     {
       config: createConfig({
         input: 'enum-null.json',

diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/union-types/index.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/union-types/index.ts
@@ -0,0 +1,2 @@
+// This file is auto-generated by @hey-api/openapi-ts
+export * from './types.gen';
diff --git a/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/union-types/types.gen.ts b/packages/openapi-ts-tests/main/test/__snapshots__/3.1.x/union-types/types.gen.ts
@@ -0,0 +1,9 @@
+// This file is auto-generated by @hey-api/openapi-ts
+
+export type Foo = {
+    bar?: number | boolean | string;
+};
+
+export type ClientOptions = {
+    baseUrl: `${string}://${string}` | (string & {});
+};
diff --git a/packages/openapi-ts-tests/specs/3.1.x/union-types.json b/packages/openapi-ts-tests/specs/3.1.x/union-types.json
@@ -0,0 +1,19 @@
+{
+  "openapi": "3.1.0",
+  "info": {
+    "title": "OpenAPI 3.1.0 union types example",
+    "version": "1"
+  },
+  "components": {
+    "schemas": {
+      "Foo": {
+        "type": "object",
+        "properties": {
+          "bar": {
+            "type": ["number", "boolean", "string"]
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/packages/openapi-ts/src/openApi/3.1.x/parser/schema.ts b/packages/openapi-ts/src/openApi/3.1.x/parser/schema.ts
@@ -920,7 +920,7 @@ const parseManyTypes = ({
     } else {
       const irTypeSchema = parseOneType({
         context,
-        irSchema: typeIrSchema,
+        irSchema: { ...typeIrSchema },
         schema: {
           ...schema,
           type,
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		// This file is auto-generated by @hey-api/openapi-ts
		export * from './types.gen';