Invalid property assignment: unknown enumeration

qrc:/qt/qml/untitled12/Main.qml:10:25: Invalid property assignment: unknown enumeration

import QtQuick

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Item {
        layer.wrapMode: 0 // ShaderEffectSource.ClampToEdge
        Component.onCompleted: console.log(ShaderEffectSource.ClampToEdge)
    }
}

import QtQuick

Window {
    id: root
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    property int test: 1 // Qt.LeftButton

    MouseArea {
        acceptedButtons: root.test
        Component.onCompleted: console.log(Qt.LeftButton)
    }
}