id: no-flask-preprocess-request-ignored
valid:
  - |
    @app.before_request
    def before():
        response = preprocess_request()
        if response:
            return response
  - |
    response = preprocess_request()
    return response
invalid:
  - |
    @app.before_request
    def before():
        preprocess_request()  # return value discarded