Headers not correctly passed to fetch client

[dakivara]

I noticed that my headers were missing when I call myFun({ headers }). The myFun was generated with orval. In my case, headers has type Headers. I looked into the generated code and found this line of code which causes the problem:

headers: { 'Content-Type': 'application/json', ...options?.headers }

The problem is that {...headers} is always an empty object.

[soartec-lab]

@dakivara
Thank you for reporting this issue.
It would be helpful for us to investigate further if you could provide us with some source code and clarify the expected behavior and the actual behavior.
Could you please share it with us?

[dakivara]

const headers = new Headers()
headers.set('my-header', 'my-value')

expected:
{...headers} is equal to {my-header: 'my-value'}

actual:
{...headers} is equal to {}

-> don't use {...headers} in the code generator. This is the problematic line of code:

orval/packages/fetch/src/index.ts

Line 255 in cb06139

? `headers: { ${headersToAdd.join(',')}, ...options?.headers }`