volumes:
  - ./development:/var/lib/localstack
  - /var/run/docker.sock:/var/run/docker.sock

const endpoint = isDevelopment() ? "http://localhost:4566" : undefined;
export const combine = (...args: any[]) => {
  return args.reduce((acc, obj) => {
    if (!obj) return acc;
    const temp:any = Object.keys(obj).reduce((acc: any, key: string) => obj[key] === undefined ? {...acc} : {...acc, [key] : obj[key]} , {});
    return { ...acc, ...temp };
  }, {});
};
const combineForEnv = (s3InitParams: string, options: any = {}) => {
  if (isDevelopment()) {
    if (options?.region) {
      delete options.region;
    }
    return combine(s3InitParams, { ...options, endpoint, s3ForcePathStyle: true });
  }
  return combine(s3InitParams, options);
};

export const s3ShimGetSignedUrlPromise = async (
  operation: string,
  params: any,
  s3InitParams?: any
) => {
  console.log("s3ShimGetSignedUrlPromise - ENTRY: ", operation, params, combine(s3InitParams));
  try {
    console.log("S3 Init Params: ", s3InitParams);

    const initParams = combineForEnv(s3InitParams);
    console.log("Init Params: ", initParams);
    const s3 = new AWS.S3(initParams);
    const result = await s3.getSignedUrlPromise(operation, params);
    console.group("s3ShimGetSignedUrlPromise - RESULT:", result);
    return result;
  } catch (e) {
    console.log("s3ShimGetSignedUrlPromise error:", e);
    throw e;
  }
};
export async function generateUploads(fileNames: string[]) {
  const uploads = fileNames.map((name) => ({
      fileName: name,
      type: lookup((mime as any).getType(name)) 
    })),
    types = uploads.reduce(
      (memo, u) => {
        memo[u.type.toLowerCase() + "s"]++;
        return memo;
      },
      { images: 0, videos: 0 } as { [k: string]: number }
    );

  // generate counter
  const ids = await getSourceIdsByType(types);

  // associate and set id
  const result = await Promise.all(
    uploads.map(async ({ fileName, type }: { fileName: string; type: string }) => {
      const sourceId = ids[type.toLowerCase() + "s"].shift();
      if (!sourceId) throw new Error("Error generating source id for upload");
      console.log("GENERATED IDs: " + JSON.stringify(ids));
      console.log("GENERATED SOURCE ID: " + sourceId.toString());
      const convertedFileName = sanitizeFileName(fileName);
      const path = `${process.env.SERVICE_ENV}_images/${sourceId}/${convertedFileName}`;
      const location = await s3ShimGetSignedUrlPromise("putObject",
        {
          Bucket: `${process.env.SERVICE_ENV}-${process.env.SERVICE_REGION}-media`,
          Key: path,
          Expires: 8 * 60 * 60 // 8 hours
        },
        {
          region: process.env.AWS_REGION_DEFAULT,
          useAccelerateEndpoint: true,
          signatureVersion: "v4"
        });
      console.log("S3: upload: ", fileName, sourceId, type, location);
      return { fileName, source: "THING", sourceId, type, location };
    })
  );
  console.log("generateUploads - RESULT: ", result);
  return result;
}
export default async function createUpload(
  _: undefined,
  { input }: { input: { fileNames: string[] } },
  // eslint-disable-next-line
  __: Context
): Promise<MutationResponse & { uploads: any[] }> {
  const uploads = await generateUploads(input.fileNames);

  console.log("createUpload - uploads: ", uploads);
  return {
    affectedCount: uploads.length,
    success: true,
    message: "Created Upload Successfully",
    uploads
  };
}
The code runs without error and prints out:
GENERATED IDs: {"images":[]}
GENERATED SOURCE ID: development_images_28710
s3ShimGetSignedUrlPromise - ENTRY:  putObject {
  Bucket: 'development-media,
  Key: 'development_images/development_images_28710/thing.jpg',
  Expires: 28800
} { useAccelerateEndpoint: true, signatureVersion: 'v4' }
S3 Init Params:  {
  region: undefined,
  useAccelerateEndpoint: true,
  signatureVersion: 'v4'
}
Init Params:  {
  useAccelerateEndpoint: true,
  signatureVersion: 'v4',
  endpoint: 'http://localhost:4566',
  s3ForcePathStyle: true
}
s3ShimGetSignedUrlPromise - RESULT: http://localhost:4566/development-media/development_images/development_images_28710/thing.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxxx&X-Amz-Date=20230114T171804Z&X-Amz-Expires=28800&X-Amz-Signature=xxxx&X-Amz-SignedHeaders=host
  S3: upload:  thing.jpg development_images_28710 IMAGE http://localhost:4566/development-media/development_images/development_images_28710/thing.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxx&X-Amz-Date=20230114T171804Z&X-Amz-Expires=28800&X-Amz-Signature=xxxx-Amz-SignedHeaders=host
  generateUploads - RESULT:  [
    {
      fileName: 'thing.jpg',
      source: 'LOCAL',
      sourceId: 'development_images_28710',
      type: 'IMAGE',
      location: 'http://localhost:4566/development-media/development_images/development_images_28710/thing.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxx&X-Amz-Date=20230114T171804Z&X-Amz-Expires=28800&X-Amz-Signature=xxxx-Amz-SignedHeaders=host'
    }
  ]
  createUpload - uploads:  [
    {
      fileName: 'thing.jpg',
      source: 'LOCAL',
      sourceId: 'development_images_28710',
      type: 'IMAGE',
      location: 'http://localhost:4566/development/development_images/development_images_28710/thing.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxx&X-Amz-Date=20230114T171804Z&X-Amz-Expires=28800&X-Amz-Signature=xxxx&X-Amz-SignedHeaders=host'
    }
  ]

localstack_local  | 2023-01-14T19:18:02.679  INFO --- [functhread54] l.services.motoserver      : starting moto server on http://0.0.0.0:54359
localstack_local  | 2023-01-14T19:18:02.681  INFO --- [   asgi_gw_0] localstack.services.infra  : Starting mock S3 service on http port 4566 ...
localstack_local  | 2023-01-14T19:18:02.707  INFO --- [   asgi_gw_0] botocore.credentials       : Found credentials in environment variables.
localstack_local  | 2023-01-14T19:18:03.182  INFO --- [   asgi_gw_0] localstack.utils.bootstrap : Execution of "require" took 746.16ms
localstack_local  | 2023-01-14T19:18:03.186 DEBUG --- [   asgi_gw_0] l.services.s3.s3_utils     : Received presign S3 URL: http://localhost:4566/development-media/development_images/development_images_28715/thing.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=xxxx&X-Amz-Date=20230114T191802Z&X-Amz-Expires=28800&X-Amz-Signature=xxxx&X-Amz-SignedHeaders=host
localstack_local  | 2023-01-14T19:18:03.190  WARN --- [   asgi_gw_0] l.services.s3.s3_utils     : Signatures do not match, but not raising an error, as S3_SKIP_SIGNATURE_VALIDATION=1
localstack_local  | 2023-01-14T19:18:03.193 DEBUG --- [   asgi_gw_0] l.services.s3.s3_utils     : Valid presign url.
localstack_local  | 2023-01-14T19:18:03.334  INFO --- [   asgi_gw_0] localstack.request.aws     : AWS s3.GetObject => 200