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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\page qmllint-warnings-and-errors-alias-cycle.html
\ingroup qmllint-warnings-and-errors
\title Alias Cycle
\brief Alias property is part of an alias cycle.
\section1 Alias Property Is Part Of An Alias Cycle
\section2 What happened?
A \l{QML Object Attributes#property-aliases}{property alias} resolves to itself or to another
alias resolving to itself.
Usually, \l{QML Object Attributes#property-aliases}{a property alias} should reference another
property either directly, or indirectly by passing through another alias property.
If a property alias directly or indirectly references itself, then it forms an alias cycle.
The warning indicates that the current alias property is inside or references
an alias cycle, see \l{#example}{Example}.
\section2 Why is this bad?
Instances of components with alias cycles will not be created at runtime: they will be null instead.
\section2 Example
\qml
import QtQuick
Item {
id: someId
property alias myself: someId.myself // not ok: referring to itself
property alias cycle: someId.cycle2 // not ok: indirectly referring to itself
property alias cycle2: someId.cycle
property alias indirect: someId.cycle // not ok: referring to alias indirectly referring to itself
}
\endqml
You can fix this warning by breaking up the alias cycles:
\qml
import QtQuick
Item {
id: someId
Item {
id: anotherId
property string myself
property int cycle
}
property alias myself: anotherId.myself // ok: referring to a property
property alias cycle: someId.cycle2 // ok: does not refer to itself anymore
property alias cycle2: anotherId.cycle // ok: not a cycle anymore
property alias indirect: someId.cycle // ok: cycle does not form an alias cycle anymore
}
\endqml
*/
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