I’m not able to get js files to work when using the Node 20 environment.

I’m just trying to run this script:

export const handler = async (event) => {
  // TODO implement
  const response = {
    statusCode: 200,
    body: JSON.stringify('Hello from Lambda!'),
  };
  return response;
};

I get this response:

{
  "errorType": "Runtime.UserCodeSyntaxError",
  "errorMessage": "SyntaxError: Unexpected token 'export'",
  "trace": [
    "Runtime.UserCodeSyntaxError: SyntaxError: Unexpected token 'export'",
    "    at _loadUserApp (file:///var/runtime/index.mjs:1084:17)",
    "    at async UserFunction.js.module.exports.load (file:///var/runtime/index.mjs:1119:21)",
    "    at async start (file:///var/runtime/index.mjs:1282:23)",
    "    at async file:///var/runtime/index.mjs:1288:1"
  ]
}

If I rename the file to index.mjs it works… but I need to run js files. Is this not possible with Node 20 aws? Appreciate any help. Thanks.