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GD0103: The exported member is read-only

Rule ID	GD0103
Category	Usage
Fix is breaking or non-breaking	Non-breaking
Enabled by default	Yes

Cause

A read-only member is annotated with the [Export] attribute. Read-only members can't be exported.

Rule description

Godot doesn't allow exporting read-only members.

// Read-only fields can't be exported.
[Export]
public readonly int invalidField;

// This field can be exported because it's not declared 'readonly'.
[Export]
public int validField;

// Read-only properties can't be exported.
[Export]
public int InvalidProperty { get; }

// This property can be exported because it has both a getter and a setter.
[Export]
public int ValidProperty { get; set; }

How to fix violations

To fix a violation of this rule for fields, remove the readonly keyword or remove the [Export] attribute.

To fix a violation of this rule for properties, make sure the property declares both a getter and a setter, or remove the [Export] attribute.

When to suppress warnings

Do not suppress a warning from this rule. Read-only members can't be exported so they will be ignored by Godot, resulting in runtime errors.