Compiler Targets

HoloScript compiles a single .holo source file to multiple platform targets.

Canonical target keys are defined in ExportTarget (packages/core/src/compiler/CircuitBreaker.ts).

# SSOT: inspect registered target enum members
grep -n "export enum ExportTarget" -A 200 packages/core/src/compiler/CircuitBreaker.ts

Common targets (non-exhaustive)

Target Flag	File	Output	Platform
--target unity	unity.md	C# MonoBehaviour	Unity Engine
--target unreal	unreal.md	C++ / Blueprint	Unreal Engine 5
--target godot	godot.md	GDScript	Godot Engine 4.x
--target vrchat	vrchat.md	UdonSharp C#	VRChat SDK3
--target babylon	babylon.md	JavaScript	Babylon.js
--target webgpu	webgpu.md	TypeScript	Modern Browsers
--target ios	ios.md	Swift + ARKit	iOS 15+
--target visionos	vision-os.md	Swift + RealityKit	Apple Vision Pro
--target android	android.md	Kotlin + ARCore	Android SDK 26+
--target androidxr	android-xr.md	Kotlin	Android XR
--target openxr	openxr.md	C++	Cross-platform XR
--target threejs	three-js.md	JavaScript	Three.js / Web
--target gltf	gltf.md	GLB/glTF	Universal 3D
--target wasm	wasm.md	WASM binary	WebAssembly
--target urdf	robotics/urdf.md	URDF XML	ROS 2
--target sdf	robotics/sdf.md	SDF XML	Gazebo
--target dtdl	iot/dtdl.md	DTDL JSON	Azure Digital Twins
--target wot	iot/wot.md	WoT TD JSON	W3C Web of Things
--target playcanvas	playcanvas.md	JavaScript	PlayCanvas Engine
--target ar	ar.md	TypeScript	Browser WebXR AR
--target tsl	tsl.md	WGSL	Trait Shader Language
--target neuromorphic	neuromorphic.md	NIR bytecode	Loihi2 / SpiNNaker
--target a2a	a2a.md	JSON Agent Card	Google A2A Protocol
--target scm	scm.md	Python + dowhy	Causal AI
--target usd-physics	usd-physics.md	USD Physics JSON	visionOS / Omniverse
--target openxr-spatial	openxr-spatial.md	OpenXR JSON	AR/VR Anchoring
--target ai-glasses	ai-glasses.md	Platform SDK	Meta / Snap / Apple Glasses
--target vr-reality	vr-reality.md	Phoenix WebXR	VRR Digital Twins
--target nft-marketplace	nft-marketplace.md	Solidity + JS	NFT / Web3

Common Compiler Options

All compilers support:

Option	Description
--output <path>	Output directory
--verbose	Show detailed compilation info
--watch	Recompile on file changes
--sourcemap	Generate source maps (where applicable)

Usage

# Compile to a specific target
holoscript compile scene.holo --target unity --output ./Assets/Generated/

# Compile to multiple targets
holoscript compile scene.holo --target unity --target godot --output ./builds/

# Watch mode
holoscript compile scene.holo --target webgpu --watch

Groupings

Game Engines

Unity · Unreal · Godot · VRChat

Web & Browser

WebGPU · Three.js · Babylon.js · GLTF · WASM

Mobile & XR

iOS ARKit · visionOS · Android ARCore · Android XR · OpenXR

Robotics

URDF (ROS 2) · SDF (Gazebo)

IoT & Digital Twins

DTDL (Azure) · WoT (W3C)

Utility Surface (beyond rendering)

Not every utility capability is a compiler target. HoloScript also provides:

Capability	Where to look
Data/service pipelines	.hs flows and Node/service-oriented targets (for runtime orchestration)
Agent interoperability	A2A target and protocol docs in docs/agents/
Schema mapping / digital twins	DTDL, WoT, Absorb docs
Observability and tracing	Telemetry/tracing paths in core/runtime + platform docs
Knowledge market and team ops	HoloMesh and orchestrator APIs (not compiler outputs)

Use compiler docs for output artifacts, and use runtime/service docs for orchestration, observability, and marketplace flows.

See Also

• Traits Reference — Trait → platform mapping
• CLI Reference — Full compiler CLI options
• Python Bindings — Compile from Python