Nested JSON objects dont seem to work along with file uploads (multipart from request)

[mikkelam]

What version of Elysia is running?

1.1.26

What platform is your computer?

Darwin 23.6.0 arm64 arm

What steps can reproduce the bug?

Having an endpoint that allows nested JSON structure doesn't seem to work. In this example i create an endpoint and use it with eden. Im not quite sure if it's eden that has the issue or Elysia. Please direct the issue accordingly.

test.ts:

import { Elysia, t } from "elysia";
import { treaty } from "@elysiajs/eden";

const app = new Elysia().post(
  "/image",
  ({ body: { image, nested } }) => nested,
  {
    type: "multipart/form-data",
    body: t.Object({
      nested: t.Object({
        key: t.String(),
      }),
      image: t.File(),
    }),
  },
);
const eden = treaty(app);

try {
  const resp = await eden.image.post({
    nested: { key: "value" },
    image: Bun.file("./test.ts"),
  });
  console.log(JSON.stringify(resp, null, 2));
} catch (error: any) {
  console.log("Error:", error.value);
}

What is the expected behavior?

200 status code, properly validating the nested object

What do you see instead?

Output:

❯ bun test.ts
{
  "data": null,
  "error": {
    "status": 422,
    "value": {
      "type": "validation",
      "on": "body",
      "summary": "Expected object",
      "property": "/nested",
      "message": "Expected object",
      "expected": {
        "nested": {
          "key": ""
        },
        "image": "File"
      },
      "found": {
        "image": {},
        "nested": "[object Object]"
      },
      "errors": [
        {
          "summary": "Expected object",
          "type": 46,
          "schema": {
            "type": "object",
            "properties": {
              "key": {
                "type": "string"
              }
            },
            "required": [
              "key"
            ]
          },
          "path": "/nested",
          "value": "[object Object]",
          "message": "Expected object"
        }
      ]
    }
  },
  "response": {},
  "status": 422,
  "headers": {
    "content-type": "application/json"
  }
}

Additional information

No response

Have you try removing the node_modules and bun.lockb and try again yet?

yep