Incomplete support for ES6 destructuring

import QtQuick 2.15
import QtQuick.Window 2.15

Window {
    width: 640
    height: 480
    visible: true

    Component.onCompleted: {
        console.log("Assigning constants...")
        let [a, b] = [1, 2]
        console.log(a, b)

        console.log("Swapping variables...")
        [a, b] = [b, a]
        console.log(a, b)
    }
}