Required region in IAM Client

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

In aws-sdk v2, the IAM region was not required, but in v3, an error occurs "Error: Region is missing" if there is no region.
same issue #1995, but I think it isn't fixed.

SDK version number

@aws-sdk/client-iam@3.620.0

Which JavaScript Runtime is this issue in?

Node.js

Details of the browser/Node.js/ReactNative version

v18.18.2

Reproduction Steps

execute source code

async function iam_summary_test() {
    const iam = new IAMClient({ credentials: makeCredentials() })
    const command = new GetAccountAuthorizationDetailsCommand({});
    const data = await iam.send(command);

    return data
}

Observed Behavior

Throw error Region is missing

Expected Behavior

Work properly

Possible Solution

No response

Additional Information/Context

No response

[zshzbh]

Hey @anhnh131 ,

Sorry this this experience, I confirm that I can reproduce this issue.

SDK version : @aws-sdk/client-iam 3.621.0

Code I have :

import {IAMClient,GetAccountAuthorizationDetailsCommand} from '@aws-sdk/client-iam'
async function iam_summary_test() {
	const iam = new IAMClient()
	const command = new GetAccountAuthorizationDetailsCommand({});
	const data = await iam.send(command);
	console.log(data);
	return data
	}

	await iam_summary_test()

Error message:

/Users/zshzbh/Desktop/newProj/node_modules/@smithy/config-resolver/dist-cjs/index.js:117
    throw new Error("Region is missing");
          ^

I will report this issue to the JS SDK SDE team. I will let you know if we have any updates!

Thanks!
Maggie

[zshzbh]

Hey @anhnh131 ,

Thank you for bringing this up! We have put this issue in the queue.

While waiting for the fix in the pkg, there's some workarounds to unblock your work for now. I'm sharing 2 ways to configure the region:

1. You can put the service region(eg: us-west-1) in the client config input for now

const iam = new IAMClient({region: 'us-east-1'});

2. You can add region in the aws config file.

Thanks!
Maggie