constructor

constructor<
  RunInput extends Record<string, any> = Record<string, any>,
  RunOutput extends Record<string, any> = Record<string, any>,
  CallOptions extends RunnableConfig<Record<string, any>> = RunnableConfig<Record<string, any>>
>(
  fields: RunnableAssignFields<RunInput> | RunnableMap<RunInput, Record<string, any>>
): RunnableAssign<RunInput, RunOutput, CallOptions>