fix: headers field name and type for OpenAPI schema (#101)

* fix: fix headers field name and type for openapi schema

Fixes #98

* refactor: prefer `Record` type

---------

Co-authored-by: Johann Schopplich <mail@johannschopplich.com>

Author: mattmess1221

playground/pages/petStore.vue

@@ -15,6 +15,10 @@ const status = ref<typeof availableStatus[number] | undefined>()
 const { data: user, execute } = await usePetStoreData('/user/{username}', {
   path: { username: 'user1' },
   cache: true,
+  headers: {
+    'api_key': 'special',
+    'x-test-header': 'test',
+  },
 })
 
 const { data, error } = await usePetStoreData('/pet/findByStatus', {
@@ -91,6 +95,22 @@ async function abandonGarfield() {
     console.error('Response body:', (error as NuxtError).data)
   }
 }
+
+async function removePet(petId: number) {
+  try {
+    await $petStore('/pet/{petId}', {
+      method: 'DELETE',
+      path: { petId },
+      headers: {
+        'api_key': 'special-key',
+        'x-test-header': 'test',
+      },
+    })
+  }
+  catch (error) {
+    console.error(error)
+  }
+}
 </script>
 
 <template>

src/runtime/openapi.ts

@@ -16,7 +16,9 @@ export type FetchResponseError<T extends Record<PropertyKey, any>> = NuxtError<E
 export type MethodOption<M, P> = 'get' extends keyof P ? { method?: M } : { method: M }
 
 export type ParamsOption<T> = T extends { parameters?: any, query?: any }
-  ? T['parameters']
+  ? Omit<T['parameters'], 'cookie' | 'header'> & {
+    headers?: T['parameters']['header'] | Record<string, unknown>
+  }
   : Record<string, unknown>
 
 export type RequestBodyOption<T> = OperationRequestBodyContent<T> extends never