"errorMessage": "require is not defined in ES module scope, you can use import instea-CodePudding

When I use the aws-sdk module Node.js 18.x:

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

exports.handler = async (event) => {
    console.log('Hello!');
    // some code
};

I got this error:

{
  "errorType": "ReferenceError",
  "errorMessage": "require is not defined in ES module scope, you can use import instead",
  "trace": [
    "ReferenceError: require is not defined in ES module scope, you can use import instead",
    "    at file:///var/task/index.mjs:1:13",
    "    at ModuleJob.run (node:internal/modules/esm/module_job:193:25)",
    "    at async Promise.all (index 0)",
    "    at async ESMLoader.import (node:internal/modules/esm/loader:530:24)",
    "    at async _tryAwaitImport (file:///var/runtime/index.mjs:921:16)",
    "    at async _tryRequire (file:///var/runtime/index.mjs:970:86)",
    "    at async _loadUserApp (file:///var/runtime/index.mjs:994:16)",
    "    at async UserFunction.js.module.exports.load (file:///var/runtime/index.mjs:1035:21)",
    "    at async start (file:///var/runtime/index.mjs:1200:23)",
    "    at async file:///var/runtime/index.mjs:1206:1"
  ]
}

The same code works fine with late versions for example Node.js 16.x.

What is the reason of this error, and how can we avoid it.

CodePudding user response：

Node18 for Lambda uses JavaScript SDK V3 .

AWS SDK for Javascript v2 publishes a single npm package that supports all the AWS services. This makes it easy to use multiple services in a project at the cost of a large dependency when only using a handful of services or operations.

In resource constrained environment such as mobile devices, having separate packages for each service client allows optimizing the dependency. The AWS SDK for Javascript v3 provides such modular packages. We have also split up the core parts of the SDK so that service clients only pull in what they need. For example, a service that sends responses in JSON will no longer need to also have an XML parser as a dependency.

As you only import modules that you need, you can do so like below:

const { S3 } = require("@aws-sdk/client-s3");

SDK V2

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

const s3Client = new AWS.S3({});
await s3Client.createBucket(params).promise();

SDK V3

const { S3 } = require("@aws-sdk/client-s3");

const s3Client = new S3({});
await s3Client.createBucket(params)