callback <Function> invoke to return info back to caller
error <Error> an optional parameter that you can use to provide results of the failed Lambda function execution. When a Lambda function succeeds, you can pass null as the first parameter.
result <Object> an optional parameter that you can use to provide the result of a successful function execution. The result provided must be JSON.stringify compatible. If an error is provided, this parameter is ignored.
module.exports(environmentVariable, handler)
environmentVariable <String> an optional parameter containing environment variable name used to store the configuration. If not used, a default value of CONFIG is used.
handler <Function> called when the handler is invoked
callback <Function> invoke to return info back to caller
error <Error> an optional parameter that you can use to provide results of the failed Lambda function execution. When a Lambda function succeeds, you can pass null as the first parameter.
result <Object> an optional parameter that you can use to provide the result of a successful function execution. The result provided must be JSON.stringify compatible. If an error is provided, this parameter is ignored.