[Feature]: Encode and Decode for Lamda calls

[pjosols]

Self-service

• I'd be willing to implement this feature

Template name

v2-to-v3

Input code

const AWS = require("aws-sdk");

const lambda = new AWS.Lambda({ region: util_1.requireEnvironmentVariable('AWS_REGION') });
        const sns = new AWS.SNS({ region: util_1.requireEnvironmentVariable('AWS_REGION') });

function getSnsPublishFunction(sns) {
    return (input) => sns.publish(input).promise();
}


const params = {
            FunctionName: lambdaName,
            InvocationType: 'RequestResponse',
            Payload: JSON.stringify(dbEvent),
        };


 const response = await lambda.invoke(params).promise();
        const payload = JSON.parse(_.get(response, ['Payload']));

Expected Output

const {
          Lambda
      } = require("@aws-sdk/client-lambda"),
      {
          SNS, PublishCommand
      } = require("@aws-sdk/client-sns");


const lambda = new Lambda({ region: util_1.requireEnvironmentVariable('AWS_REGION') });
const sns = new SNS({ region: util_1.requireEnvironmentVariable('AWS_REGION') });

function getSnsPublishFunction(sns) {
    return (input) => {
        const command = new PublishCommand(input);
        sns.send(command);
    }
}


const params = {
            FunctionName: lambdaName,
            InvocationType: 'RequestResponse',
            Payload: new TextEncoder().encode(JSON.stringify(dbEvent)),
        };

const response = await lambda.invoke(params);
const payload = JSON.parse(new TextDecoder('utf-8').decode(_.get(response, ['Payload'])));

Additional context

No response

[trivikr]

We don't plan to convert client.operation() to client.send(new OperationCommand()) in v2-to-v3 transformer.
We may add a future transformer, say api-to-command, if there's a requirement which multiple users ask for.

About Encoder/Decoder, some mixin type support could be provided in JS SDK v3 which transformer can support, instead of using TextEncoder/TextDecoder. Can you create a feature request on v3 repo, or upvote an existing one, if present?

[trivikr]

We may add a future transformer, say api-to-command, if there's a requirement which multiple users ask for.

This will be tracked in #497