I am trying to create a Lambda that when triggered by an S3 object being created, will read the contents of the file (which is JSON). When I tried that out with this code:

... (other code omitted) ...

bucket.onObjectCreated('on_created', async e => {
  if (e.Records) {
    for (const rec of e.Records) {
      const file = aws.s3.getBucketObject({
        bucket: bucketName.get(),
        key: rec.s3.object.key
      });

      console.log('body', (await file).body);
    }
  }
});

I get this error message in CloudWatch:

{
  "errorType": "Runtime.ImportModuleError",
  "errorMessage": "Error: Cannot find module '@pulumi/aws/s3/index.js'\nRequire stack:\n- /var/task/__index.js\n- /var/runtime/UserFunction.js\n- /var/runtime/index.js",
  "stack": [
    "Runtime.ImportModuleError: Error: Cannot find module '@pulumi/aws/s3/index.js'",
    "Require stack:",
    "- /var/task/__index.js",
    "- /var/runtime/UserFunction.js",
    "- /var/runtime/index.js",
    "    at _loadUserApp (/var/runtime/UserFunction.js:100:13)",
    "    at Object.module.exports.load (/var/runtime/UserFunction.js:140:17)",
    "    at Object.<anonymous> (/var/runtime/index.js:43:30)",
    "    at Module._compile (internal/modules/cjs/loader.js:955:30)",
    "    at Object.Module._extensions..js (internal/modules/cjs/loader.js:991:10)",
    "    at Module.load (internal/modules/cjs/loader.js:811:32)",
    "    at Function.Module._load (internal/modules/cjs/loader.js:723:14)",
    "    at Function.Module.runMain (internal/modules/cjs/loader.js:1043:10)",
    "    at internal/main/run_main_module.js:17:11"
  ]
}

This is the line that is causing the issue:

const file = aws.s3.getBucketObject({

I have this import at the top of my TypeScript file:

import * as aws from '@pulumi/aws';

So what am I doing wrong?

For code running at runtime (not deployment time) you need to use the AWS sdk instead of the Pulumi SDKs. Pulumi makes the AWS sdk absolve for you at

aws.sdk

. See for example: https://github.com/pulumi/examples/blob/11d7bb90bf5b7b2df7fb59c6fe48cca971faefc5/aws-ts-scheduled-function/index.ts#L14

thanks @white-balloon-205!