No AWS.Signers.V4 in aws-sdk

[wong2]

Describe the bug

const signer = new AWS.Signers.V4(req, "managedblockchain")

Gives Property 'Signers' does not exist on type 'typeof import

Expected Behavior

Should just work.

Current Behavior

Property 'Signers' does not exist on type 'typeof import

Reproduction Steps

Code above

Possible Solution

Add missing types.

Additional Information/Context

No response

SDK version used

2.1221.0

Environment details (OS name and version, etc.)

Node.js 16