Please note: although I mention AWS SAM and DynamoDB here, I think this is more of an AWS JavaScript SDK, or possibly even just a Node/NPM question at heart, and as such, is probably answerable by anyone with experience writing Node/JavaScript apps on AWS Lambda.

I used AWS SAM to initialize a "Hello World"-style JavaScript Lambda repo, and used it to deploy that Lambda behind an API Gateway. It was actually pretty cool and very little work to get everything configured correctly.

I am now trying to modify the boilerplate TypeScript code (essentially, the TypeScript Lambda handler) to read/write to a DynamoDB table.

In my Lambda handler, I added:

import { PutCommand } from "@aws-sdk/lib-dynamodb";

...and ran sam build, which amongst other things, invokes EsBuild for compiling/linting. This line of code fails with the following error:

Build Failed
Error: NodejsNpmEsbuildBuilder:EsbuildBundle - Esbuild Failed: ✘ [ERROR] Could not resolve "@aws-sdk/lib-dynamodb"

    app.ts:5:27:
      5 │ import { PutCommand } from "@aws-sdk/lib-dynamodb";
        ╵                            ~~~~~~~~~~~~~~~~~~~~~~~

So I look in my package.json (that AWS SAM generated for me), and I see:

{
  "name": "my-lambda",
  "version": "1.0.0",
  "description": "experimental",
  "main": "app.js",
  "repository": "<redacted>",
  "author": "me myself and i",
  "license": "MIT",
  "scripts": {
    "unit": "jest",
    "lint": "eslint '*.ts' --quiet --fix",
    "compile": "tsc",
    "test": "npm run compile && npm run unit"
  },
  "devDependencies": {
    "@types/aws-lambda": "^8.10.92",
    "@types/jest": "^29.2.0",
    "@types/node": "^18.11.4",
    "@typescript-eslint/eslint-plugin": "^5.10.2",
    "@typescript-eslint/parser": "^5.10.2",
    "esbuild": "^0.14.14",
    "esbuild-jest": "^0.5.0",
    "eslint": "^8.8.0",
    "eslint-config-prettier": "^8.3.0",
    "eslint-plugin-prettier": "^4.0.0",
    "jest": "^29.2.1",
    "prettier": "^2.5.1",
    "ts-node": "^10.9.1",
    "typescript": "^4.8.4"
  }
}

So, I think this makes sense, right? The aws-sdk/lib-dynamodb package is not installed. So, from the root of the repo, I run:

npm i @aws-sdk/lib-dynamodb

And then re-run sam build...only to get the exact same error.

Why am I getting this error and what can I do to fix it so that my Lambda handler call pull in all the necessary components of the AWS DynamdoDB JavaScript client?

CodePudding user response：

The name of the package which holds the client is @aws-sdk/client-dynamodb.

Install and import from that.

https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/clients/client-dynamodb/index.html