util-dynamodb throws "Error: Unsupported type passed: [object Map]" for Map object

[trivikr]

Describe the bug

@aws-sdk/util-dynamodb throws "Error: Unsupported type passed: [object Map]" for Map object

Your environment

SDK version number

@aws-sdk/[email protected]

Is the issue in the browser/Node.js/ReactNative?

All

Details of the browser/Node.js/ReactNative version

N/A

Steps to reproduce

Code

const { marshall } = require("@aws-sdk/util-dynamodb");

(async () => {
  const input = new Map();
  input.set("a", 1);
  input.set("b", 2);

  console.log(JSON.stringify(marshall(input)));
})();

Observed behavior

Running the code throws the following error:

(node:11653) UnhandledPromiseRejectionWarning: Error: Unsupported type passed: [object Map]. Pass options.convertClassInstanceToMap=true to marshall typeof object as map attribute.

On passing convertClassInstanceToMap=true, it returns {}

Expected behavior

util-dynamodb converts JavaScript Map into DynamoDB Attribute Map

Additional context

Noticed while working on #1974

[github-actions]

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