- Qt 6.9
- Qt Qml
- QML Lint Warning and Errors
- Unresolved alias
- Qt 6.9.3 Reference Documentation

# Unresolved alias

This warning category is spelled `[unresolved-alias]` by qmllint.

## Unresolved alias

### What happened?

A property alias should hold a reference to another property, see also QML Object Attributes - Property Aliases. In this case, it holds a reference to a property that was not found.

### Why is this bad?

Instances of components with unresolved alias will not be created at runtime: they will be null instead.

### Example

     import QtQuick

     Item {
         id: someId
         property int helloWorld

         property alias helloWorldAlias: helloWorld      // not ok: aliases have to refer by id
         property alias helloWorldAlias2: someId.helloWorlddd    // not ok: no helloWorlddd in someId
         property alias helloWorldAlias3: someIddd.helloWorld    // not ok: someIddd does not exist
     }

To fix this warning, make sure that the id and the property of the alias property really do exist:

     import QtQuick

     Item {
         id: someId
         property int helloWorld

         property alias helloWorldAlias: someId.helloWorld   // ok: alias refers by id
         property alias helloWorldAlias2: someId.helloWorld  // ok: helloWorld does exist in someId
         property alias helloWorldAlias3: someId.helloWorld  // ok: someId does exist
     }