<!--
{
  "availability" : [
    "iOS: 27.0.0 -",
    "iPadOS: 27.0.0 -",
    "tvOS: 27.0.0 -",
    "visionOS: 27.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "RealityKit",
  "identifier" : "/documentation/RealityKit/ShaderGraph/NodeDefinition/availability-swift.property",
  "metadataVersion" : "0.1.0",
  "role" : "Instance Property",
  "symbol" : {
    "kind" : "Instance Property",
    "modules" : [
      "RealityKit"
    ],
    "preciseIdentifier" : "s:11ShaderGraphAAC14NodeDefinitionV12availabilitySDyAD8PlatformOAD12AvailabilityOGvp"
  },
  "title" : "availability"
}
-->

# availability

The availability of this node definition on each platform.

```
var availability: [ShaderGraph.NodeDefinition.Platform : ShaderGraph.NodeDefinition.Availability] { get }
```

## Discussion

Prefer [`isAvailable(on:version:)`](/documentation/RealityKit/ShaderGraph/NodeDefinition/isAvailable(on:version:)) for point-in-time availability checks.
Use this property when you need the full version range — for example, to display
availability annotations in a node library UI.

---

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