salix/client/core/src/lib/key-codes.js

function validKey(key) {
    let keycode = key.keyCode || key;

    let valid =
        (keycode > 47 && keycode < 58) || // number keys
        (keycode > 64 && keycode < 91) || // letter keys
        (keycode > 95 && keycode < 112) || // numpad keys
        (keycode > 185 && keycode < 193) || // ;=,-./` (in order)
        (keycode > 218 && keycode < 223);   // [\]' (in order)

    return valid;
}

export default validKey;