TS-like syntax for QML types

[KoneTaH]

Hi all! I recently noticed that some parts of the documentation mentioned a new typing syntax (TypeScript-like). For example, here is an old syntax:

// MyItem.qml
import QtQuick 2.0

Item {
    function myQmlFunction(msg) {
        console.log("Got message:", msg)
        return "some return value"
    }
}

// MyItem.qml
import QtQuick 2.0

Item {
    id: item
    width: 100; height: 100

    signal qmlSignal(var anObject)

    MouseArea {
        anchors.fill: parent
        onClicked: item.qmlSignal(item)
    }
}

and here is a new one:

// MyItem.qml
import QtQuick 2.0

Item {
    function myQmlFunction(msg: string) : string {
        console.log("Got message:", msg)
        return "some return value"
    }
}

// MyItem.qml
import QtQuick 2.0

Item {
    id: item
    width: 100; height: 100

    signal qmlSignal(anObject: Item)

    MouseArea {
        anchors.fill: parent
        onClicked: item.qmlSignal(item)
    }
}

Does anyone know when exactly support for the new syntax was added and where is it mentioned? Starting from what version of Qt can it be safely used? I tried to find some traces in changelists, but no luck. Thanks in advance for your help.

[kenneth.fernandez]

@KoneTaH said in TS-like syntax for QML types:

function myQmlFunction(msg: string)

Hi @KoneTaH ,

That feature is supported from version Qt 5.15 / Qt Quick 2.0 ahead. As Qt is doing some changes for QML this will be more common in the future releases.

Here is an example:

https://doc.qt.io/qt-5/qtqml-cppintegration-interactqmlfromcpp.html

I hope this give some overview,

[KoneTaH]

@kenneth-fernandez Thanks!