Migration Guide - March 2026 Updates

This guide covers breaking changes and migration steps for updates pushed to main in March 2026.

Three.js 0.183.2 Upgrade

Breaking Changes

TSL API Change: atan2 has been renamed to atan in Three.js TSL exports.

Migration Steps

Update Three.js imports in custom shader code:

// ❌ Old (0.182.0)
import { atan2 } from 'three/tsl';

const angle = atan2(y, x);

// ✅ New (0.183.2)
import { atan } from 'three/tsl';

const angle = atan(y, x);

Update package.json if you have Three.js version pinned:

{
  "dependencies": {
    "three": "0.183.2"
  },
  "overrides": {
    "three": "0.183.2"
  }
}

Rebuild your project:

bun run clean
bun install
bun run build

Files Affected

packages/procgen/src/geometry/LeafMaterialTSL.ts - Updated atan2 → atan
All packages with Three.js dependency upgraded to 0.183.2

New Features

TSL Typed Node Aliases: New type exports for better TypeScript support:

import type { TSLNodeFloat, TSLNodeVec2, TSLNodeVec3, TSLNodeVec4 } from '@hyperscape/shared';

Environment Variable Changes

Removed Variables

The following environment variables have been removed and are no longer supported:

Streaming Configuration (Removed)

STREAM_CAPTURE_DISABLE_WEBGPU - WebGPU is now required, no fallback
DUEL_FORCE_WEBGL_FALLBACK - WebGL fallback removed (WebGPU-only)
DUEL_CAPTURE_USE_XVFB - Xvfb is now auto-detected on Linux
DUEL_DISABLE_BRIDGE_CAPTURE - Bridge capture is now always enabled

Development Mode (Removed)

SERVER_DEV_LEAN_MODE - Lean mode system removed entirely
SERVER_DEV_LEAN_ALLOW_DUEL_BETTING - No longer needed
SERVER_DEV_LEAN_ALLOW_STREAMING_DUEL - No longer needed
SERVER_DEV_LEAN_ALLOW_STREAMING_CAPTURE - No longer needed
SERVER_DEV_LEAN_ALLOW_DUEL_SCHEDULER - No longer needed
SERVER_DEV_LEAN_ALLOW_MODEL_AGENTS - No longer needed
SERVER_DEV_LEAN_ALLOW_AUTO_AGENTS - No longer needed
SERVER_DEV_LEAN_ALLOW_TERRAIN_MESH_COLLISION - No longer needed
SERVER_DEV_LEAN_ALLOW_DUEL_ARENA_VISUALS - No longer needed

Betting/Market Maker (Removed)

BOT_KEYPAIR - Moved to hyperbet repository
ORACLE_AUTHORITY_KEYPAIR - Moved to hyperbet repository
MARKET_MAKER_KEYPAIR - Moved to hyperbet repository
DUEL_MARKET_MAKER_ENABLED - Moved to hyperbet repository
ARENA_SERVICE_ENABLED - Moved to hyperbet repository
DUEL_SKIP_CHAIN_SETUP - Moved to hyperbet repository

Runtime Health (Removed)

GAME_STATE_POLL_TIMEOUT_MS - No longer used
GAME_STATE_POLL_INTERVAL_MS - No longer used
DUEL_RUNTIME_HEALTH_INTERVAL_MS - No longer used
DUEL_RUNTIME_HEALTH_MAX_FAILURES - No longer used

Changed Variables

CDN Configuration (Unified)

# ❌ Old (deprecated)
DUEL_PUBLIC_CDN_URL=https://assets.hyperscape.club
DUEL_ALLOW_INHERITED_CDN_URL=true

# ✅ New (unified)
PUBLIC_CDN_URL=https://assets.hyperscape.club

Migration: Replace all instances of DUEL_PUBLIC_CDN_URL with PUBLIC_CDN_URL in your .env files.

Streaming Configuration (Updated Defaults)

# Updated defaults (March 2026)
STREAM_CAPTURE_MODE=cdp                    # Was: mediarecorder on Linux
STREAM_CAPTURE_CHANNEL=chrome-beta         # Was: chrome-unstable
STREAM_CAPTURE_ANGLE=vulkan                # Was: default (Linux NVIDIA)
STREAM_CAPTURE_WIDTH=1280                  # Was: 1920
STREAM_CAPTURE_HEIGHT=720                  # Was: 1080
FFMPEG_PATH=ffmpeg                         # Was: /usr/bin/ffmpeg (now auto-resolved)

Migration: Remove explicit overrides if you were using defaults. The new defaults are optimized for production streaming.

HLS Configuration (Updated Defaults)

# Updated defaults (March 2026)
HLS_TIME_SECONDS=1                         # Was: 2
HLS_LIST_SIZE=30                           # Was: 24
HLS_DELETE_THRESHOLD=120                   # Was: 96

Migration: No action needed unless you explicitly set these values. New defaults provide better segment alignment and replay buffer.

Streaming Pipeline Changes

ANGLE Backend Selection

Change: Default ANGLE backend changed from explicit vulkan to default for automatic best-backend selection. Migration:

# ❌ Old (explicit Vulkan)
STREAM_CAPTURE_ANGLE=vulkan
--use-angle=vulkan --enable-features=DefaultANGLEVulkan,Vulkan,VulkanFromANGLE

# ✅ New (auto-select)
STREAM_CAPTURE_ANGLE=default
--use-angle=default

# ✅ macOS (explicit Metal)
STREAM_CAPTURE_ANGLE=metal
--use-angle=metal

Rationale: Auto-selection provides better compatibility across different GPU configurations and driver versions.

FFmpeg Resolution Order

Change: System FFmpeg is now preferred over ffmpeg-static to avoid segfaults. Resolution Order:

/usr/bin/ffmpeg (system package manager)
/usr/local/bin/ffmpeg (Homebrew, manual install)
ffmpeg on PATH
ffmpeg-static npm package (fallback)

Migration: Install system FFmpeg for best reliability:

# macOS
brew install ffmpeg

# Ubuntu/Debian
sudo apt install ffmpeg

# Vast.ai (auto-installed by deploy script)
# No action needed

Chrome Channel

Change: Switched from Chrome Unstable to Chrome Beta for better stability. Migration:

# ❌ Old
STREAM_CAPTURE_CHANNEL=chrome-unstable

# ✅ New
STREAM_CAPTURE_CHANNEL=chrome-beta

Installation:

# macOS
brew install --cask google-chrome-beta

# Linux (auto-installed by deploy script)
wget -q -O - https://dl.google.com/linux/linux_signing_key.pub | sudo apt-key add -
sudo sh -c 'echo "deb [arch=amd64] http://dl.google.com/linux/chrome/deb/ stable main" >> /etc/apt/sources.list.d/google-chrome.list'
sudo apt update
sudo apt install google-chrome-beta

Frame Pacing (March 11, 2026)

Change: Enforced 30fps frame pacing to eliminate stream buffering. New Behavior:

CDP everyNthFrame changed from 1→2 (halves compositor delivery from ~60fps to ~30fps)
Frame pacing skips frames arriving faster than 85% of 33.3ms target interval
Output resolution default changed from 1920x1080→1280x720

Migration: No action needed. New defaults eliminate buffering and reduce bandwidth. Override (if you need higher resolution):

STREAM_CAPTURE_WIDTH=1920
STREAM_CAPTURE_HEIGHT=1080

Service Worker Changes

Cache Strategy

Change: Switched from CacheFirst to NetworkFirst for JS/CSS. Impact: Eliminates stale module errors after rebuilds. Migration: Clear browser cache after updating:

# Chrome DevTools
1. Open DevTools (F12)
2. Application tab → Storage → Clear site data
3. Hard reload (Ctrl+Shift+R / Cmd+Shift+R)

# Or use incognito mode for testing

Cache Clearing (Development)

Change: Aggressive cache clearing added for local development. Behavior: Service worker and cache buckets are automatically cleared on localhost/127.0.0.1 to prevent stale module errors. Migration: No action needed. Development experience is now smoother.

Test Infrastructure Changes

WebGPU Test Exclusions

Change: @hyperscape/impostor excluded from headless CI test runs. Rationale: WebGPU is unavailable on GitHub Actions runners. Package requires GPU-enabled browsers. Migration: Run impostor tests locally:

# Local testing (requires GPU)
cd packages/impostors
bun test

# CI testing (excluded automatically)
# No action needed

Test Timeouts

Change: Increased sim-engine guarded MEV fee sweep test timeout from 60s to 120s. Rationale: Prevents flaky CI failures on slower runners. Migration: No action needed. Tests are now more reliable.

Deployment Changes

SSH Session Timeout Fix

Change: Background processes now use disown to prevent SSH session timeout. Impact: Vast.ai deployments complete in ~1 minute instead of hanging for 30 minutes. Migration: Update scripts/deploy-vast.sh if you have custom deployment scripts:

# ❌ Old (hangs SSH)
Xvfb :99 -screen 0 1280x720x24 &

# ✅ New (detaches from shell)
Xvfb :99 -screen 0 1280x720x24 & disown

Database Changes

Connection Pool

Change: PostgreSQL connection pool increased from 10 to 20 connections. Rationale: Prevents timeout errors under load. Migration: No action needed. Pool size is auto-configured. Override (if needed):

POSTGRES_POOL_MAX=20
POSTGRES_POOL_MIN=2

Physics Optimization

Streaming/Spectator Viewports

Change: Client-side PhysX initialization skipped for streaming/spectator viewports. Rationale: Streaming clients don’t need physics simulation - they only render world state. Impact: Faster startup, reduced memory footprint for spectator views. Migration: No action needed. Optimization is automatic based on URL parameters (?page=stream, ?mode=spectator).

Dependency Updates

Major Version Bumps

Capacitor: 7.6.0 → 8.2.0 (Android, iOS, Core)
lucide-react: → 0.577.0
three-mesh-bvh: 0.8.3 → 0.9.9
eslint: → 10.0.3
jsdom: → 28.1.0

Migration: Run bun install to update dependencies. No code changes required.

Verification Checklist

After migrating, verify the following:

Local Development

bun install completes without errors
bun run build succeeds
bun run dev starts all services
Game loads at http://localhost:3333
No console errors related to Three.js or TSL
Service worker clears cache on localhost

Streaming (if applicable)

bun run dev:duel starts streaming pipeline
Chrome Beta is installed and detected
FFmpeg is system-installed (not ffmpeg-static)
ANGLE backend is set to default (or metal on macOS)
Stream resolution is 1280x720 (or custom override)
No buffering or frame drops on stream output
Playwright doesn’t inject --enable-unsafe-swiftshader

Production Deployment

PUBLIC_CDN_URL is set (not DUEL_PUBLIC_CDN_URL)
Database connection pool is 20 (or custom override)
Removed environment variables are not set
Service worker uses NetworkFirst strategy
Xvfb starts before PM2 on Linux
Background processes use disown in deploy scripts

Rollback Instructions

If you encounter issues after migrating:

Three.js Rollback

# Revert to 0.182.0
cd packages/shared
npm install three@0.182.0 @types/three@0.182.0
cd ../client
npm install three@0.182.0
cd ../..
bun run build

Environment Variable Rollback

# Restore old CDN variable (temporary)
DUEL_PUBLIC_CDN_URL=https://assets.hyperscape.club
PUBLIC_CDN_URL=https://assets.hyperscape.club  # Keep both during transition

Streaming Rollback

# Revert to old streaming defaults
STREAM_CAPTURE_MODE=mediarecorder
STREAM_CAPTURE_CHANNEL=chrome-unstable
STREAM_CAPTURE_ANGLE=vulkan
STREAM_CAPTURE_WIDTH=1920
STREAM_CAPTURE_HEIGHT=1080

Support

If you encounter migration issues:

Check AGENTS.md for recent changes documentation
Review CLAUDE.md for detailed architecture notes
Search closed issues: https://github.com/HyperscapeAI/hyperscape/issues
Open a new issue with migration context and error logs

Timeline

March 10, 2026: Three.js 0.183.2 upgrade, streaming pipeline overhaul
March 11, 2026: Frame pacing fix, deployment timeout fix, test infrastructure updates

​Migration Guide - March 2026 Updates

​Three.js 0.183.2 Upgrade

​Breaking Changes

​Migration Steps

​Files Affected

​New Features

​Environment Variable Changes

​Removed Variables

​Streaming Configuration (Removed)

​Development Mode (Removed)

​Betting/Market Maker (Removed)

​Runtime Health (Removed)

​Changed Variables

​CDN Configuration (Unified)

​Streaming Configuration (Updated Defaults)

​HLS Configuration (Updated Defaults)

​Streaming Pipeline Changes

​ANGLE Backend Selection

​FFmpeg Resolution Order

​Chrome Channel

​Frame Pacing (March 11, 2026)

​Service Worker Changes

​Cache Strategy

​Cache Clearing (Development)

​Test Infrastructure Changes

​WebGPU Test Exclusions

​Test Timeouts

​Deployment Changes

​SSH Session Timeout Fix

​Database Changes

​Connection Pool

​Physics Optimization

​Streaming/Spectator Viewports

​Dependency Updates

​Major Version Bumps

​Verification Checklist

​Local Development

​Streaming (if applicable)

​Production Deployment

​Rollback Instructions

​Three.js Rollback

​Environment Variable Rollback

​Streaming Rollback

​Support

​Timeline