AWS Lambda Function: Cannot find package imported

Question

I added the knex module (for example) to my function lambda (Node.js 14.x) from a lambda layer. When I deploy my function in AWS Lambda and I use require in my lambda function works but with import not works.

Note: Locally works with require and import with modules installeds in node_modules in my lambda function.

require (It works)

index.js

const knex = require('knex')(myConfig);

package.json

{
  "name": "my-function",
  "version": "1.0.0",
  "main": "index.js",
  "dependencies": {}
}

import (Not works)

index.js

import knexModule from 'knex';

const {knex} = knexModule;
const db = knex(configKnex);

package.json

{
  "name": "my-function",
  "version": "1.0.0",
  "main": "index.js",
  "type": "module",
  "dependencies": {}
}

Error

Response
{
  "errorType": "Error",
  "errorMessage": "Cannot find package 'knex' imported from /var/task/index.js\nDid you mean to import knex/knex.js?",
  "trace": [
    "Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'knex' imported from /var/task/index.js",
    "Did you mean to import knex/knex.js?",
    "    at new NodeError (internal/errors.js:322:7)",
    "    at packageResolve (internal/modules/esm/resolve.js:732:9)",
    "    at moduleResolve (internal/modules/esm/resolve.js:773:18)",
    "    at Loader.defaultResolve [as _resolve] (internal/modules/esm/resolve.js:887:11)",
    "    at Loader.resolve (internal/modules/esm/loader.js:89:40)",
    "    at Loader.getModuleJob (internal/modules/esm/loader.js:242:28)",
    "    at ModuleWrap.<anonymous> (internal/modules/esm/module_job.js:76:40)",
    "    at link (internal/modules/esm/module_job.js:75:36)",
    "    at process.runNextTicks [as _tickCallback] (internal/process/task_queues.js:60:5)",
    "    at /var/runtime/deasync.js:23:15"
  ]
}

How can I use import in AWS Lambda?

My layer downloaded from AWS Lambda looks like this:

@ApoorvaChikara I followed the instructions but without success. Thanks. — alditis
– alditis, Commented May 4, 2022 at 23:54

Soppro · Accepted Answer · 2022-06-22 04:44:51Z

1

This is because Lambda layers do not support ES modules yet, there are workarounds, however:

Symlink the node_modules folder in your layer to node_modules in your Lambda function (https://github.com/vibe/aws-esm-modules-layer-support)
Dynamic imports: https://github.com/coderbyheart/aws-lambda-esm-with-layer

edited Jun 22, 2022 at 4:44

answered Jun 21, 2022 at 16:14

Soppro

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