responses: add size/quality/background/output_format to partial image…

src/resources/responses/responses.ts

@@ -2066,6 +2066,28 @@ export interface ResponseImageGenCallPartialImageEvent {
    */
   sequence_number: number;
 
+  /**
+   * The size of the generated image. One of `1024x1024`, `1024x1536`, `1536x1024`,
+   * or `auto`.
+   */
+  size?: '1024x1024' | '1024x1536' | '1536x1024' | 'auto';
+
+  /**
+   * The quality of the generated image. One of `low`, `medium`, `high`, or `auto`.
+   */
+  quality?: 'low' | 'medium' | 'high' | 'auto';
+
+  /**
+   * Background type for the generated image. One of `transparent`, `opaque`, or
+   * `auto`.
+   */
+  background?: 'transparent' | 'opaque' | 'auto';
+
+  /**
+   * The output format of the generated image. One of `png`, `webp`, or `jpeg`.
+   */
+  output_format?: 'png' | 'webp' | 'jpeg';
+
   /**
    * The type of the event. Always 'response.image_generation_call.partial_image'.
    */

tests/typing/response-partial-image-event.test.ts

@@ -0,0 +1,43 @@
+import type { ResponseImageGenCallPartialImageEvent } from 'openai/resources/responses/responses';
+
+// This test is intentionally simple: it verifies the SDK exposes the right
+// fields on the streaming partial image event by constructing a value that
+// matches the observed payload shape. If this ever stops compiling, the
+// typings regressed.
+
+describe('ResponseImageGenCallPartialImageEvent typing', () => {
+  test('accepts full payload with image options', () => {
+    const evt: ResponseImageGenCallPartialImageEvent = {
+      type: 'response.image_generation_call.partial_image',
+      sequence_number: 7,
+      output_index: 0,
+      item_id: 'ig_123',
+      partial_image_index: 2,
+      partial_image_b64: '...base64...',
+      size: '1024x1536',
+      quality: 'high',
+      background: 'opaque',
+      output_format: 'png',
+    };
+
+    expect(evt).toHaveProperty('type', 'response.image_generation_call.partial_image');
+    expect(evt).toHaveProperty('size', '1024x1536');
+    expect(evt).toHaveProperty('quality', 'high');
+    expect(evt).toHaveProperty('background', 'opaque');
+    expect(evt).toHaveProperty('output_format', 'png');
+  });
+
+  test('optional fields can be omitted', () => {
+    const evt: ResponseImageGenCallPartialImageEvent = {
+      type: 'response.image_generation_call.partial_image',
+      sequence_number: 1,
+      output_index: 0,
+      item_id: 'ig_omit',
+      partial_image_index: 0,
+      partial_image_b64: 'AAA',
+      // size, quality, background, output_format are optional
+    };
+
+    expect(evt.item_id).toBe('ig_omit');
+  });
+});