node-rdkafka on macOS: Error: Invalid value "sasl_ssl" for configuration property "security.protocol"

Question

I am trying to connect to IBM Event Streams (previously Message Hub) using node-rdkafka and seeing the below error

/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/node_modules/node-rdkafka/lib/client.js:54
  this._client = new SubClientType(globalConf, topicConf);
                 ^

Error: Invalid value "sasl_ssl" for configuration property "security.protocol"
    at Producer.Client (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/node_modules/node-rdkafka/lib/client.js:54:18)
    at new Producer (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/node_modules/node-rdkafka/lib/producer.js:75:10)
    at new Simulator (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/Simulator.js:54:29)
    at /Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/index.js:107:33
    at step (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/index.js:52:23)
    at Object.next (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/index.js:33:53)
    at /Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/index.js:27:71
    at new Promise (<anonymous>)
    at __awaiter (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/index.js:23:12)
    at streamMessages (/Users/VMac/Documents/VMAC/Code/GIT/kafka-log-simulator/dist/index.js:102:12)

I tried other answers on StackOverflow but no luck. I am trying this on macOS 10.15.7 (Catalina)