enum EMyEnum {
    Value = 'value'
}

export {EMyEnum};

import {EMyEnum} from './common.types.js';

function internalFunction(arg: EMyEnum | null): void {
    console.log(arg);
}

export {internalFunction};

declare module 'my-module' {
    import {EMyEnum} from './common.types.js';

    function externalFunction(arg: EMyEnum | null): void;

    export {externalFunction};
}

import {externalFunction} from 'my-module';
import {internalFunction} from './utilities.js';

// INCORRECT: TS DOES NOT HIGHLIGHT THE ERROR
externalFunction('TEST');

// CORRECT: TS HIGHLIGHTS ERROR BECAUSE THE ARGUMENT MUST BE AN ENUM
internalFunction('TEST');