[Typescript] Static block for Class

In recent Typescript, it is possible to define static block

class Car {
    static nextSerialNumber = 100
    static {
        // this is the static field
        fetch('https://get-next-serial-number.com')
            .then(res => res.json())
            .then(data => {this.nextSerialNumber = data.mostRecentInvokedId + 1})
    }
}

When the static block run?

It runs as soon as the Class definition runs. So it runs before we create a new class instances.