21-add-external-dependencies-to-an-aws-lambda-function-deployed-with-cdk.md

Add external dependencies to an AWS Lambda function deployed with CDK

📹 Video

Let's figure out how to add unique, random ids (a.k.a. the Partition Key) to our todos.

👍 We'll add the uuid dependency to our lambda function.

Navigate to the lambda directory and run:

• npm init -y

This will initialize a new package.json. Then run:

• yarn add uuid
• yarn add @types/uuid

(since we are using typescript)

Then in our lambda function, import uuid:

• import { v4 as uuid} from "uuid"

Now change the addTodoItem:

Item: {
    // use either an id provided through the UI, or get a randomly generated id with uuid
    id: id || uuid(),
    todo
}

👍 Test that uuid is working by adding a new todo via a REST client.