Generate service method request body types as model types when not references

[rcbevans]

The generated client service methods declare request body types inline as part of the method definition:

    public static patchUserMe({
        requestBody,
    }: {
        requestBody: {
            /**
             * The new name of the user
             */
            name?: string | null;
            ...
        },
    }): CancelablePromise<DetailedUser> {
        return __request(OpenAPI, {
            method: 'PATCH',
            url: '/user/me',
            body: requestBody,
            mediaType: 'application/json',
        });
    }

I am utilizing openapi-typescript-codgen to have a single source of truth for API definition, and so would like to pass the defined request body type to express as ReqBody generic params.

I am able to extract the types I was using some more typescript generics, but it would be great if the request bodies were declared as separately usable types for direct access with a naming convention like UserServicePatchUserMeRequestBody.

export type ClassMethodType<T, M extends keyof T> = T[M] extends Function
  ? T[M]
  : never;

export type RequestBody<T extends { requestBody: unknown }> = T['requestBody'];

export type PatchUserMeRequestBody = RequestBody<Params<ClassMethodType<UserService, 'patchUserMe'>[0]>

As a work around I think I could also declare the request body schema as a component then reference it, but since these bodies are typically only used for one path, I prefer having them declared in place.

[smarlhens]

Hey @rcbevans, not sure if it fit your needs, but I've tried this #1700 . adding a new option to export each operation options as type.