AbortSignal type doesn't conform to WHATWG API

[aquark]

Describe the bug
When I attempt to pass an AbortSignal created using the browser's native AbortController to an SDK client, I get a type error:

Argument of type 'AbortSignal' is not assignable to parameter of type 'import("/Volumes/Brazil/IhmCartwheel/src/IhmCartwheel/image/node_modules/.pnpm/amazon.goshawk.aws.a2z.com/@aws-sdk/types/1.0.0-beta.4/node_modules/@aws-sdk/types/build/abort").AbortSignal'.
  Types of property 'onabort' are incompatible.
    Type '((this: AbortSignal, ev: Event) => any) | null' is not assignable to type 'AbortHandler | undefined'.
      Type 'null' is not assignable to type 'AbortHandler | undefined'.ts(2345)

This also prevents using the NodeJS abort-controller package. The WHATWG spec for this API requires that the handler defaults to null, not undefined.

I don't want to use @aws-sdk/abort-controller because I have some library functions which need to interoperate with both the SDK and other AbortSignal consumers using the DOM implementation.

SDK version number 1.0.0-beta.4

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

Details of the browser/Node.js version N/A

To Reproduce (observed behavior)

import { LambdaClient, InvokeCommand } from "@aws-sdk/client-lambda";

const abortSignal = new AbortController().signal;
const client = new LambdaClient({});

client.send(
  new InvokeCommand({
    FunctionName: "GetTermsAndConditions",
    InvocationType: "RequestResponse",
  }),
  { abortSignal }
);

Expected behavior
Should pass type check

Screenshots
N/A

Additional context
Add any other context about the problem here.

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