Checkboxes for prior research

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow.
• I've searched for previous similar issues and didn't find any solution.

Describe the bug

Hi, I have an Angular application that I recently updated to version 19, and during this migration I also updated aws-sdk/client-s3 to version 3.731.1.

Before the migration the following code worked fine allowing me to upload files to S3. However, now the same code throws the exception TypeError: readableStream.getReader is not a function.

store(filename: string, data: Blob, folder: string): Promise<string> {

  const weakThis = this;

  return new Promise<string>(async (resolve, reject) => {

    try {

      const input: PutObjectRequest = {
        ACL: 'public-read',
        Bucket: this.awsBucket,
        Key: `${folder}/${filename}`,
        Body: data,
      }

      const command = new PutObjectCommand(input);
      const resp = await weakThis.client.send(command);

      if (resp.$metadata.httpStatusCode < 200 || resp.$metadata.httpStatusCode > 299) {
        this.logger.error(`[AwsFileService][store] Error storing file at path ${key}`);
        this.logger.error(`[AwsFileService][store] HTTP Status ${resp.$metadata.httpStatusCode}`);
        reject(resp.$metadata.httpStatusCode);
        return;
      }
      resolve(key);

    } catch (error) {
      debugger;
      console.log(`[AwsFileService][store] Error storing file at path ${key}`);
      this.logger.error(`[AwsFileService][store] Error storing file at path ${key}`);
      console.log(`[AwsFileService][store] ${error}`);
      this.logger.error(`[AwsFileService][store] ${error}`);
      reject(error);
    }
  });
}

Interestingly when I run the Angular application via ng serve this code works as expected. However, when I attempt to build a production copy of the application via ng build, and then run as a standard Node JS application that the issue occurs.

Environment:
Node.js: 22.12.0
Angular: 19.1.2
TypeScript: 5.7.3
aws-sdk/client-s3: 3.731.1"

Regression Issue

• Select this option if this issue appears to be a regression.

SDK version number

@aws-sdk/client-s3@3.731.1

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

22.12.0

Reproduction Steps

1. Create a typical Angular 19 application
2. Install aws-sdk/client-s3
3. Add code above in description
4. Test 1: run ng serve
5. Test 2: run ng build

Observed Behavior

Test 1: File uploads successfully
Test 2: Exception is thrown.

Expected Behavior

Test 1: File uploads successfully
Test 2: File uploads successfully

Possible Solution

No response

Additional Information/Context

No response

UPDATE

I am thinking the original Test 1 scenario is not valid. Since posting this I changed the version of aws-sdk/client-s3 back to 3.32.0 (last known working version), and now I'm able to replicate the issue regardless of how the app is built. I have switched back to 3.731.1 and am able to replicate the issue both with ng serve and ng build