Multipart uploads strips date values in the request body about needle

[tomas]

Hi, can you provide a small snippet so I can reproduce at my end?

[jcorscadden]

const endpoint = https://test-api.test.devenv/`;
const data = {
'title' : 'Test Title',
'createdDate' : new Date(),
file : {
file : 'test/fixtures/local/neil-warnock-warnock.gif',
content_type : 'image/gif'
}
};

const options = {
    headers: {
        'Token': 'xyz'
    },
    responseType: 'json',
    multipart: true
};

const result = await needle( 'post', endpoint, data, options );`

Have anonymised it quite a bit, but that's the gist of how it's working. If I log out the parameters I receive in the API side the createdDate isn't there. If I change it so that I do .toISOString() instead it works fine, so looks like the issue is due to the date type. If I don't provide 'multipart: true' in the options it will also work.