error : StyleDictionary.extend is not a function

[VijaytaWJ]

Hello All,
I am trying to use StyleDictionary as a module, the following is the code.

import StyleDictionary from 'style-dictionary';
// Extend Style Dictionary
const StyleDictionaryExtended = StyleDictionary.extend({
    source: ['tokens/**/*.json'],
    platforms: {
        dart: {
            transformGroup: 'dart',
            buildPath: 'build/dart/',
            files: [
                {
                    destination: 'tokens.dart',
                    format: 'dart/class',
                    className: 'RIBUIT',
                },
            ],
        },
    },
});
StyleDictionaryExtended.buildAllPlatforms();

however i get error as "TypeError: StyleDictionary.extend is not a function " , i checked the path, it is referring to the correct StyleDictonary.js and it does have a extend method, have read many tutorials to double check the configuration but not sure what the issue is

Style dictionary version 4.1.2 and node js version 20.17.0