How to put multiple singletons in one qmldir file?

Question

I want to use multiple singletons in one qmldir file but it doesn't seem to work, I don't have an error but the program doesn't launch.

qmldir:

singleton File1 1.0 File.qml
singleton File2 1.0 File2.qml

main:

import QtQuick 2.7
import QtQuick.Controls 2.1

Window {
    visible: true
    width: 640
    height: 480
    title: qstr("hello world!")

    Button {    
        onCliked: File2.test();
    }
}

File2.qml:

pragma Singleton
import QtQuick 2.7
Item {
    signal test;
    onTest: console.log("File2 received signal");
}

File1.qml:

pragma Singleton
import QtQuick 2.7
Item {
    signal test;
    onTest: console.log("File1 received signal");
}

The code works if I delete the second line in qmldir, but then File2 will be undefined.

Answer 1

If your qmldir file is exactly as you have written:

Singleton File1 1.0 File.qml
Singleton File2 1.0 File2.qml

The error might reside within that, as the keyword is singleton, not Singleton.

Try that:

singleton File1 1.0 File.qml
singleton File2 1.0 File2.qml

But that error should not fail silently. There should be some errors:

[main.qml] a component declaration requires two or three arguments, but 4 were provided
[qmldir] a component declaration requires two or three arguments, but 4 were provided

main.qml:

import QtQuick 2.7
import QtQuick.Controls 2.0
import '.'

ApplicationWindow {
    id: window    
    width: 800
    height: 600
    visible: true    
    Row {
        spacing: 3
        Button {
            text: 'single1'
            onClicked: Single.sig()
        }

        Button {
            text: 'signle2'
            onClicked: Single2.sig()
        }
    }    
}

singleton.qml

pragma Singleton
import QtQuick 2.0
QtObject {
    signal sig
    onSig: console.log('Singleton1 Received')
}

singleton2.qml

pragma Singleton
import QtQuick 2.0
QtObject {
    signal sig
    onSig: console.log('Singelton2 Received')
}

qmldir

singleton Single 1.0 singleton.qml
singleton Single2 1.0 singleton2.qml

---

Works like a charm.