TeaWeb/shared/js/crypto/uid.ts

function s4() {
    return Math
        .floor((1 + Math.random()) * 0x10000)
        .toString(16)
        .substring(1);
}

export function guid() {
    return s4() + s4() + '-' + s4() + '-' + s4() + '-' + s4() + '-' + s4() + s4() + s4();
}