How to properly call AWS bedrock using JavaScript SDK?

I am a newbie to using JavaScript SDK to connect to AWS Bedrock service, below is my code:

const { BedrockAgentRuntimeClient, RetrieveCommand } = require("@aws-sdk/client-bedrock-agent-runtime");


const client = new BedrockAgentRuntimeClient({
// fake credentials
    credentials: {
      accessKeyId: 'accesskey',
      secretAccessKey: 'secret',
    },
    region: "us-east-1"
});
  
const params = {
/** input parameters */
};

const command = new RetrieveCommand(params);

async function send() {
    const data = await client.send(command);

}

send();
  

In this code, what do I need to pass in params section? And, am I missing something from the code?

I searched the documentation a lot but found nothing.

Any help will be appreciated.