http-multipart-body-parser fails to parse form-data created in node

[flubber2077]

Form data created in Node has the boundary key set to boundary=----formadata-undici-[numbers] This format fails the middleware, as the regexp does not include the - character.

How to reproduce the behaviour:

To check the boundary of FormData created by Node:

const form = new Formdata() form.append('foo', 'bar') const req = new Request(new URL('http://to/'), { method: 'POST', body: form }) const contentType = req.headers.get('content-type')

This throws the error Unsupported Media Type

Expected behaviour The middleware is able to handle multipart/form-data from Node.

Environment:

• Node.js: 22
• Middy: 6.1.6
• AWS SDK: 3.617.0

Additional context For unit testing my project's upload controller. I would like to not have to enable disableContentTypeError as it should only accept form-data. If there is a better way to create a mock event with FormData, please let me know.

I can resolve it by adding a - character to the mimePattern regexp in /http-multipart-body-parser/index.js, not sure if this is the best path forward but can create a pull request if needed with this change.