editing the message (animation)

const CONFIG = {
        TEXT_OF_MESSAGE: "Hello, world!",
        PEER_IDENTIFIER: 0,
        MESSAGE_IDENTIFIER: 0,
        TIMEOUT_EDIT_MESSAGE: 1000
    }
    let index = 0;
    let timeoutIdentifier = 0;

    let editTheMessage = (message) => {
        // editing a message function
        console.log(message);
    }

    // stop script function
    let stopScript = () => clearTimeout(timeoutIdentifier);

    let main = () => {
        let currentMessage = CONFIG.TEXT_OF_MESSAGE.slice(0, index);
        editTheMessage(currentMessage);

        index = (index + 1) % CONFIG.TEXT_OF_MESSAGE.length;
        timeoutIdentifier = setTimeout(main, CONFIG.TIMEOUT_EDIT_MESSAGE);
    }

    main();