400 Invalid type for 'image': expected a file, but got an array instead

[ashbuilds]

Confirm this is a Node library issue and not an underlying OpenAI API issue

• This is an issue with the Node library

Describe the bug

The latest version of the openai-node SDK defines the image parameter in images.edit() as accepting either a single Uploadable or an array of Uploadable files:

export interface ImageEditParams {
  image: Core.Uploadable | Array<Core.Uploadable>;
  ...
}

However, when I try to pass an array of images to the image field while using the gpt-image-1 model (as the type definition seems to allow), the API responds with:

400 Invalid type for 'image': expected a file, but got an array instead.

To Reproduce

import OpenAI from "openai";

const client = new OpenAI();

const images = await Promise.all([
  fetch(`http://localhost:3000${img.image.url_1}`),
  fetch(`http://localhost:3000${img.image.url_2}`),
]);

await client.images.edit({
  model: "gpt-image-1",
  prompt: "Combine these",
  image: images, // 👈 Passes an array as allowed by type definition
});

OS

macOs

Node version

Node v22.10.0

Library version

v4.97.0