This question references the method examples in AWS SDK for Javascript documentation.
The examples on the page (ie. Describing a table) splits up the code into modules:
- ddbClient.js (has configuration settings).
- ddb_describetable.js (has code that actually runs the method).
In ddb_describetable.js, why is there an export in front of the "const params..." and the "const run = async"? Can you explain the purpose with a high level example/best practices in relation to AWS or nodejs (if examples/best practices apply)?
ddbClient.js
// Create service client module using ES6 syntax.
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
// Set the AWS Region.
const REGION = "REGION"; //e.g. "us-east-1"
// Create an Amazon DynamoDB service client object.
const ddbClient = new DynamoDBClient({ region: REGION });
export { ddbClient };
ddb_describetable.js
// Import required AWS SDK clients and commands for Node.js
import { DescribeTableCommand } from "@aws-sdk/client-dynamodb";
import { ddbClient } from "./libs/ddbClient.js";
// Set the parameters
export const params = { TableName: "TABLE_NAME" }; //TABLE_NAME
export const run = async () => {
try {
const data = await ddbClient.send(new DescribeTableCommand(params));
console.log("Success", data);
// console.log("Success", data.Table.KeySchema);
return data;
} catch (err) {
console.log("Error", err);
}
};
run();
The actual DescribeTableCommand code documentation (which doesn't show an example) doesn't imply that this structure should be used.
