mvp dynamic loading

[supervoidcoder]

as you know omniblocks loads the entire project into ram before running it which if you've coded in any other language, you know its...

questionable...

as an mvp we could make it just an extension that lets you load and unload sprites at will (pretty sure there's a vm call for that probably) and man this would immediately make projects more performant and more importantly NOT destroy the player's RAM

[supervoidcoder]

@coderabbitai look in OmniBlocks/scratch-vm to get a hang of how extensions work and then maybe say what you think?

[traycerai]

Plan

Observations

The OmniBlocks codebase is built on Scratch VM and currently loads entire projects into RAM via vm.loadProject(). The VM provides vm.addSprite() and vm.deleteSprite() methods for sprite management. Extensions are registered using Scratch.extensions.register() and can access the VM through window.vm. The sprite data structure includes costumes, sounds, blocks, and metadata. Existing addons like initialise-sprite-position and remove-sprite-confirm demonstrate how to hook into VM sprite operations.

Approach

Create an MVP extension that provides blocks for dynamically loading and unloading sprites at runtime. The extension will serialize sprite data to browser storage (IndexedDB or localStorage), remove sprites from memory when unloaded, and restore them when needed. This approach reduces RAM usage by keeping only active sprites in memory while preserving sprite data for later restoration. The extension will integrate with the existing VM API and follow the established extension pattern used in OmniBlocks.

Implementation Steps

1. Create Extension File Structure

Create a new extension file at file:src/lib/libraries/extensions/dynamic-sprite-loader.js following the pattern in file:src/examples/extensions/example-extension.js.

2. Define Extension Metadata

Implement the getInfo() method with:

• Extension ID: dynamicSpriteLoader
• Extension name: "Dynamic Sprite Loader"
• Icon and documentation URI
• Block definitions for the core functionality

3. Implement Core Blocks

Define the following blocks in the extension:

Command Blocks:

• unloadSprite [SPRITE_NAME] - Serializes sprite data to storage and removes from VM
• loadSprite [SPRITE_NAME] - Restores sprite from storage back to VM
• unloadAllExcept [SPRITE_NAME] - Unloads all sprites except the specified one

Reporter Blocks:

• isLoaded [SPRITE_NAME] - Returns boolean indicating if sprite is currently loaded
• unloadedSpritesList - Returns list of unloaded sprite names
• loadedSpritesList - Returns list of currently loaded sprite names

Boolean Blocks:

• spriteIsUnloaded [SPRITE_NAME] - Boolean check for unloaded state

4. Implement Storage Layer

Create storage management functions:

Serialization:

• Extract sprite data from vm.runtime.targets by sprite name
• Serialize sprite object including: blocks, costumes, sounds, variables, position, direction, visibility, and all other properties
• Store serialized data in IndexedDB with key format: dynamicSprite_${spriteName}

Deserialization:

• Retrieve sprite data from IndexedDB by name
• Reconstruct sprite object in the format expected by vm.addSprite()
• Handle missing or corrupted data gracefully

5. Implement Unload Functionality

In the unloadSprite block implementation:

• Validate sprite exists in vm.runtime.targets
• Serialize sprite data using the storage layer
• Call vm.deleteSprite(targetId) to remove from VM
• Maintain internal registry of unloaded sprites (in-memory Map)
• Handle edge cases: stage cannot be unloaded, currently editing sprite

6. Implement Load Functionality

In the loadSprite block implementation:

• Check if sprite is already loaded (exists in vm.runtime.targets)
• Retrieve serialized data from storage
• Call vm.addSprite(spriteData) to restore sprite
• Update internal registry
• Handle errors: sprite not found in storage, invalid data

7. Implement Utility Functions

Helper Functions:

• getSpriteByName(name) - Find target in vm.runtime.targets by name
• getAllSpriteNames() - Get list of all sprite names from targets
• isStage(target) - Check if target is the stage
• validateSpriteName(name) - Ensure sprite name is valid

State Management:

• Maintain a Map of unloaded sprites: unloadedSprites = new Map()
• Track sprite metadata: name, unload timestamp, storage key

8. Add Menu Definitions

Create dynamic menus for sprite selection:

• spriteMenu - Returns list of currently loaded sprites
• unloadedSpriteMenu - Returns list of unloaded sprites
• Use these menus in block arguments for sprite name selection

9. Implement Error Handling

Add robust error handling for:

• Storage quota exceeded
• Sprite not found
• Invalid sprite data
• VM operation failures
• Concurrent load/unload operations

Return meaningful error messages through console warnings or alerts.

10. Add Extension to Library

Register the extension in file:src/lib/libraries/extensions/index.jsx:

• Add extension metadata entry
• Include icon, name, description
• Set appropriate tags (e.g., 'tw', 'utility')
• Mark as featured if desired

11. Test Integration Points

Verify the extension works with:

• vm.addSprite() - Ensure restored sprites function correctly
• vm.deleteSprite() - Confirm proper cleanup
• vm.runtime.targets - Validate target list updates
• Redux state updates via vm.emitTargetsUpdate()

12. Optimize for Performance

Memory Management:

• Clear sprite references after unload
• Implement garbage collection hints
• Monitor storage usage

Lazy Loading:

• Only deserialize sprite data when needed
• Cache frequently accessed sprites
• Implement LRU eviction if storage fills

13. Add User Feedback

Implement visual indicators:

• Console logs for load/unload operations
• Success/failure notifications
• Storage usage statistics (optional reporter block)

Architecture Diagram

sequenceDiagram
    participant User
    participant Extension
    participant VM
    participant Storage
    participant Runtime

    User->>Extension: unloadSprite("Sprite1")
    Extension->>Runtime: Find sprite in vm.runtime.targets
    Runtime-->>Extension: Return target object
    Extension->>Storage: Serialize and store sprite data
    Storage-->>Extension: Confirm stored
    Extension->>VM: vm.deleteSprite(targetId)
    VM->>Runtime: Remove from targets array
    Extension-->>User: Sprite unloaded

    User->>Extension: loadSprite("Sprite1")
    Extension->>Storage: Retrieve sprite data
    Storage-->>Extension: Return serialized data
    Extension->>VM: vm.addSprite(spriteData)
    VM->>Runtime: Add to targets array
    Extension-->>User: Sprite loaded

Loading

Data Flow

Operation	Input	Processing	Output
Unload	Sprite name	Serialize → Store → Delete from VM	Success/Error
Load	Sprite name	Retrieve → Deserialize → Add to VM	Success/Error
Check Status	Sprite name	Query targets array	Boolean
List Unloaded	None	Query storage keys	Array of names

Key Considerations

• Stage Protection: Never allow unloading the stage sprite
• Active Sprite: Prevent unloading the currently editing sprite
• Clone Handling: Only unload original sprites, not clones
• Variable Scope: Preserve sprite-local variables during unload/load cycle
• Asset Management: Ensure costumes and sounds are properly handled by VM's asset system
• Broadcast Messages: Maintain broadcast message references
• Custom Blocks: Preserve custom block definitions

Import In IDE

🤖 Prompt for AI Agents

## Observations

The OmniBlocks codebase is built on Scratch VM and currently loads entire projects into RAM via `vm.loadProject()`. The VM provides `vm.addSprite()` and `vm.deleteSprite()` methods for sprite management. Extensions are registered using `Scratch.extensions.register()` and can access the VM through `window.vm`. The sprite data structure includes costumes, sounds, blocks, and metadata. Existing addons like `initialise-sprite-position` and `remove-sprite-confirm` demonstrate how to hook into VM sprite operations.

## Approach

Create an MVP extension that provides blocks for dynamically loading and unloading sprites at runtime. The extension will serialize sprite data to browser storage (IndexedDB or localStorage), remove sprites from memory when unloaded, and restore them when needed. This approach reduces RAM usage by keeping only active sprites in memory while preserving sprite data for later restoration. The extension will integrate with the existing VM API and follow the established extension pattern used in OmniBlocks.

## Implementation Steps

### 1. Create Extension File Structure

Create a new extension file at `file:src/lib/libraries/extensions/dynamic-sprite-loader.js` following the pattern in `file:src/examples/extensions/example-extension.js`.

### 2. Define Extension Metadata

Implement the `getInfo()` method with:
- Extension ID: `dynamicSpriteLoader`
- Extension name: "Dynamic Sprite Loader"
- Icon and documentation URI
- Block definitions for the core functionality

### 3. Implement Core Blocks

Define the following blocks in the extension:

**Command Blocks:**
- `unloadSprite [SPRITE_NAME]` - Serializes sprite data to storage and removes from VM
- `loadSprite [SPRITE_NAME]` - Restores sprite from storage back to VM
- `unloadAllExcept [SPRITE_NAME]` - Unloads all sprites except the specified one

**Reporter Blocks:**
- `isLoaded [SPRITE_NAME]` - Returns boolean indicating if sprite is currently loaded
- `unloadedSpritesList` - Returns list of unloaded sprite names
- `loadedSpritesList` - Returns list of currently loaded sprite names

**Boolean Blocks:**
- `spriteIsUnloaded [SPRITE_NAME]` - Boolean check for unloaded state

### 4. Implement Storage Layer

Create storage management functions:

**Serialization:**
- Extract sprite data from `vm.runtime.targets` by sprite name
- Serialize sprite object including: blocks, costumes, sounds, variables, position, direction, visibility, and all other properties
- Store serialized data in IndexedDB with key format: `dynamicSprite_${spriteName}`

**Deserialization:**
- Retrieve sprite data from IndexedDB by name
- Reconstruct sprite object in the format expected by `vm.addSprite()`
- Handle missing or corrupted data gracefully

### 5. Implement Unload Functionality

In the `unloadSprite` block implementation:
- Validate sprite exists in `vm.runtime.targets`
- Serialize sprite data using the storage layer
- Call `vm.deleteSprite(targetId)` to remove from VM
- Maintain internal registry of unloaded sprites (in-memory Map)
- Handle edge cases: stage cannot be unloaded, currently editing sprite

### 6. Implement Load Functionality

In the `loadSprite` block implementation:
- Check if sprite is already loaded (exists in `vm.runtime.targets`)
- Retrieve serialized data from storage
- Call `vm.addSprite(spriteData)` to restore sprite
- Update internal registry
- Handle errors: sprite not found in storage, invalid data

### 7. Implement Utility Functions

**Helper Functions:**
- `getSpriteByName(name)` - Find target in `vm.runtime.targets` by name
- `getAllSpriteNames()` - Get list of all sprite names from targets
- `isStage(target)` - Check if target is the stage
- `validateSpriteName(name)` - Ensure sprite name is valid

**State Management:**
- Maintain a Map of unloaded sprites: `unloadedSprites = new Map()`
- Track sprite metadata: name, unload timestamp, storage key

### 8. Add Menu Definitions

Create dynamic menus for sprite selection:
- `spriteMenu` - Returns list of currently loaded sprites
- `unloadedSpriteMenu` - Returns list of unloaded sprites
- Use these menus in block arguments for sprite name selection

### 9. Implement Error Handling

Add robust error handling for:
- Storage quota exceeded
- Sprite not found
- Invalid sprite data
- VM operation failures
- Concurrent load/unload operations

Return meaningful error messages through console warnings or alerts.

### 10. Add Extension to Library

Register the extension in `file:src/lib/libraries/extensions/index.jsx`:
- Add extension metadata entry
- Include icon, name, description
- Set appropriate tags (e.g., 'tw', 'utility')
- Mark as featured if desired

### 11. Test Integration Points

Verify the extension works with:
- `vm.addSprite()` - Ensure restored sprites function correctly
- `vm.deleteSprite()` - Confirm proper cleanup
- `vm.runtime.targets` - Validate target list updates
- Redux state updates via `vm.emitTargetsUpdate()`

### 12. Optimize for Performance

**Memory Management:**
- Clear sprite references after unload
- Implement garbage collection hints
- Monitor storage usage

**Lazy Loading:**
- Only deserialize sprite data when needed
- Cache frequently accessed sprites
- Implement LRU eviction if storage fills

### 13. Add User Feedback

Implement visual indicators:
- Console logs for load/unload operations
- Success/failure notifications
- Storage usage statistics (optional reporter block)

### Architecture Diagram

```mermaid
sequenceDiagram
    participant User
    participant Extension
    participant VM
    participant Storage
    participant Runtime

    User->>Extension: unloadSprite("Sprite1")
    Extension->>Runtime: Find sprite in vm.runtime.targets
    Runtime-->>Extension: Return target object
    Extension->>Storage: Serialize and store sprite data
    Storage-->>Extension: Confirm stored
    Extension->>VM: vm.deleteSprite(targetId)
    VM->>Runtime: Remove from targets array
    Extension-->>User: Sprite unloaded

    User->>Extension: loadSprite("Sprite1")
    Extension->>Storage: Retrieve sprite data
    Storage-->>Extension: Return serialized data
    Extension->>VM: vm.addSprite(spriteData)
    VM->>Runtime: Add to targets array
    Extension-->>User: Sprite loaded
```

### Data Flow

| Operation | Input | Processing | Output |
|-----------|-------|------------|--------|
| Unload | Sprite name | Serialize → Store → Delete from VM | Success/Error |
| Load | Sprite name | Retrieve → Deserialize → Add to VM | Success/Error |
| Check Status | Sprite name | Query targets array | Boolean |
| List Unloaded | None | Query storage keys | Array of names |

### Key Considerations

- **Stage Protection**: Never allow unloading the stage sprite
- **Active Sprite**: Prevent unloading the currently editing sprite
- **Clone Handling**: Only unload original sprites, not clones
- **Variable Scope**: Preserve sprite-local variables during unload/load cycle
- **Asset Management**: Ensure costumes and sounds are properly handled by VM's asset system
- **Broadcast Messages**: Maintain broadcast message references
- **Custom Blocks**: Preserve custom block definitions

---

Execution Information

Branch: main
Commit: a2ba540

---

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[github-actions]

Hi @supervoidcoder! Thanks for opening this issue.

You bring up a great point about the current approach of loading the entire project into RAM, which can indeed be performance-intensive for larger projects. Your MVP suggestion of developing an extension to dynamically load and unload sprites is an interesting and practical idea—especially for optimizing performance and reducing memory usage. Leveraging the existing VM calls for this could streamline implementation, and you're right that it would be a huge quality-of-life improvement for creators who handle more complex projects.

I'll take a deeper dive into OmniBlocks/scratch-vm to better understand how existing extensions are structured and provide more input. Great thinking here! Let me know if you have specific ideas or concerns you'd like to emphasize!

[github-actions]

🎭 Issue Poem

In the land of OmniBlocks, sprites galore,
But loading them all? Oh, we can't ignore!
A dance through RAM, what a sight to see,
Yet players' patience fades, as you might agree.

So let’s dream of loading, a sprinkle of glee,
Sprites on the fly, like magic, whee! ✨
An MVP extension, swift and bright,
More performant coding, let’s take flight!

---

Generated with ❤️ by the OmniBlocks Poetry Bot

[coderabbitai]

Tip

For best results, initiate chat on the files or code changes.

🧩 Analysis chain

@supervoidcoder Let me explore the scratch-vm repository to understand the extension system and sprite management.

---

🏁 Script executed:

#!/bin/bash
# Clone the scratch-vm repository
git clone https://github.com/OmniBlocks/scratch-vm.git /tmp/scratch-vm
cd /tmp/scratch-vm

# Find extension files and structure
echo "=== Extension Directory Structure ==="
fd -t d extension src/

echo -e "\n=== Extension Files ==="
fd -e js . src/extensions/ | head -20

echo -e "\n=== Looking for extension examples ==="
ls -la src/extensions/ | head -20

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
cd /tmp/scratch-vm

# Look at a sample extension to understand the structure
echo "=== Sample Extension Structure ==="
fd -e js . src/extensions/ -x head -50 {} \; | head -100

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
cd /tmp/scratch-vm

# Search for sprite-related methods in the VM
echo "=== Sprite Management Methods ==="
rg -n "addSprite|removeSprite|loadSprite|unloadSprite|deleteSprite" --type js -C 2

echo -e "\n=== Runtime Sprite Methods ==="
rg -n "class Runtime" --type js -A 50 | head -100

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
cd /tmp/scratch-vm

# Look for target (sprite) management
echo "=== Target Management ==="
rg -n "addTarget|removeTarget|deleteTarget" --type js -C 2 | head -80

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
cd /tmp/scratch-vm

# Look at extension manager to understand how extensions are loaded
echo "=== Extension Manager ==="
cat src/extension-support/extension-manager.js | head -150

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Use gh to browse the scratch-vm repository
echo "=== Checking scratch-vm repository structure ==="
gh api repos/OmniBlocks/scratch-vm/contents/src/extensions --jq '.[] | select(.type=="file") | .name' | head -20

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Get a sample extension file
echo "=== Fetching a sample extension ==="
gh api repos/OmniBlocks/scratch-vm/contents/src/extensions/scratch3_pen/index.js --jq '.content' | base64 -d | head -100

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Search for sprite/target management in the VM
echo "=== Looking for Runtime class and methods ==="
gh api /search/code?q=repo:OmniBlocks/scratch-vm+addTarget+in:file --jq '.items[] | "\(.path):\(.repository.full_name)"' | head -10

echo -e "\n=== Looking for sprite management ==="
gh api /search/code?q=repo:OmniBlocks/scratch-vm+deleteSprite+in:file --jq '.items[] | "\(.path):\(.repository.full_name)"' | head -10

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Get the runtime.js file to see sprite/target methods
echo "=== Fetching runtime.js ==="
gh api repos/OmniBlocks/scratch-vm/contents/src/engine/runtime.js --jq '.content' | base64 -d | grep -A 5 -B 5 "addTarget\|deleteTarget\|removeTarget" | head -80

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Get extension manager
echo "=== Fetching extension-manager.js ==="
gh api repos/OmniBlocks/scratch-vm/contents/src/extension-support/extension-manager.js --jq '.content' | base64 -d | head -200

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Check if the repository exists and get basic info
echo "=== Repository Info ==="
gh repo view OmniBlocks/scratch-vm --json name,description,url

echo -e "\n=== List extensions directory ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/extensions --jq '.[] | select(.type=="file" or .type=="dir") | .name'

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Get a sample extension - try the pen extension
echo "=== Pen Extension Sample ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/extensions/scratch3_pen/index.js --jq -r '.content' | base64 -d | head -150

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Search for runtime methods related to targets/sprites
echo "=== Searching for target management methods ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/engine/runtime.js --jq -r '.content' | base64 -d | grep -n "^\s*[a-zA-Z_]*Target\|^\s*[a-zA-Z_]*Sprite" | head -30

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Get the full runtime.js to analyze sprite/target methods
echo "=== Runtime.js - Target Methods ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/engine/runtime.js --jq -r '.content' | base64 -d > /tmp/runtime.js
grep -A 10 "addTarget\|deleteTarget\|duplicateSprite" /tmp/runtime.js | head -100

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Look at extension manager structure
echo "=== Extension Manager Structure ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/extension-support/extension-manager.js --jq -r '.content' | base64 -d | head -250

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Check gh auth status
echo "=== GH Auth Status ==="
gh auth status

echo -e "\n=== Testing basic gh api ==="
gh api /repos/OmniBlocks/scratch-vm | jq -r '.name, .description'

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# Try a simpler approach - just check if repo exists
echo "=== Basic repo check ==="
gh api /repos/OmniBlocks/scratch-vm --jq '{name, private, default_branch}'

Unrecoverable error: Failed to clone repository

---

🏁 Script executed:

#!/bin/bash
# List top-level contents
echo "=== Repository root contents ==="
gh api /repos/OmniBlocks/scratch-vm/contents --jq '.[] | {name, type}'

Unrecoverable error: Failed to clone repository

---

@supervoidcoder I'm running into access issues with the sandbox environment - can't pull the scratch-vm repo right now. However, I can still share some thoughts on your MVP dynamic loading approach based on general Scratch VM architecture:

The Concept ✨

Your idea is solid - creating an extension that adds blocks like:

• load sprite [name]
• unload sprite [name]
• is sprite [name] loaded?

What to Look For in Your VM

In a typical Scratch VM (and likely OmniBlocks):

1. runtime.addTarget() - Adds sprites/targets to the runtime
2. runtime.disposeTarget() - Removes sprites and cleans up
3. runtime.targets - Array of active targets/sprites

The extension would essentially:

class DynamicLoadingExtension {
  loadSprite({SPRITE_NAME}, util) {
    // Load sprite data from storage/URL
    // Call runtime.addTarget() with the sprite data
  }
  
  unloadSprite({SPRITE_NAME}, util) {
    // Find the target by name
    // Call runtime.disposeTarget() to remove it
  }
}

Key Considerations 💭

Storage: Where do you keep the sprite data when unloaded?

• IndexedDB for large sprites?
• Compressed JSON in memory?
• External files?

State Management: Do you preserve:

• Variable values when unloading?
• Position/costume/effects?
• Clone state?

Performance: This aligns with your learning about moving to web workers - the loading/serialization could block the main thread for huge sprites.

MVP Scope 🎯

Start simple:

• Load/unload by sprite name
• Store serialized sprite data somewhere accessible
• Don't worry about preserving state initially
• Focus on RAM reduction first, optimize later

Want me to sketch out what the extension structure should look like once you share some example extension code from your VM?

---

🧠 Learnings used

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-28T03:09:05.973Z
Learning: In the OmniBlocks/scratch-gui repository, supervoidcoder (void) is planning to add a 3D mode and is excited about using PlayCanvas as a full 3D game engine for OmniBlocks.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T01:45:53.675Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder is planning to expand OmniBlocks from a Scratch mod into a full IDE, requiring support for multiple file types beyond just block-based projects. The primary project format will use the `.omb` extension, with potential for additional extensions in the `omb` namespace (e.g., `.ombc`, `.ombs`) as IDE features are added.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-01T12:10:19.386Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder prefers a division of labor where Amazon Q handles fast review for ethics and project vision concerns, while CodeRabbit performs deep technical review of code quality, security, architecture, and implementation details.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-01T21:36:30.624Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder clarified that "OmniBlocks" is the name of the overall multi-language IDE, while the block-based editing mode should be called "Visual editor" (not "Visual IDE"). The project is one unified IDE with specialized editors for different languages (Visual editor for blocks, NanoScript for text-based code, etc.), not multiple separate IDEs.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-02T15:49:57.724Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder wants to improve the tutorials system (not remove it) by making tutorials interactive with features like dynamic button highlighting, automatic step validation, and animated transitions, rather than just static image/video popups.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 519
File: src/playground/index.ejs:176-176
Timestamp: 2025-12-05T17:47:27.981Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder's Scratch username is scratchcode1_2_3.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:01:57.123Z
Learning: In the OmniBlocks/scratch-gui repository, team member supervoidcoder can be called "void" in reviews and conversations.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-10T17:57:45.191Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder envisions OmniBlocks/desktop as a complete "live in it" creative environment that integrates all creative tools (code, paint, sound, DAW) with a built-in browser, terminal, file manager, and more - essentially creating a creative operating system where users can spend their entire workflow without switching to external applications. This "creative habitat" concept is a key justification for the Electron desktop app.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-04T16:32:04.480Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder wants to maintain OmniBlocks-specific UltraBox modifications by forking ultrabox_typescript into a separate OmniBlocks/ultrabox repository with clean TypeScript source code, then using GitHub Actions to automatically build and deploy the minified beepbox_editor.min.js to scratch-gui's static/ folder on every push.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-18T22:18:13.164Z
Learning: For OmniBlocks/scratch-gui small features, supervoidcoder prefers GUI-only changes that avoid modifying scratch-blocks; deliver as a single, self-contained PR.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-09T21:20:10.083Z
Learning: OmniBlocks scratch-vm must initialize runtime.extensionRuntimeOptions before loading extensions (e.g., in VM constructor or Runtime constructor) to avoid crashes when the extension reads .javascriptUnsandboxed, matching PenguinMod/TurboWarp behavior.

---

Learnt from: ampelectrecuted
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-01T21:36:53.313Z
Learning: In OmniBlocks/scratch-gui, the project naming convention is: "Visual IDE" refers to the Scratch mod containing both blocks and NanoScript editors; "PyS" refers to the Python-in-blocks feature; "OmniPython" refers to the full Python IDE. The "Omni[Language]" prefix is reserved for full-featured language-specific IDEs within the OmniBlocks multi-language IDE project.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:25:31.991Z
Learning: In the OmniBlocks/scratch-gui repository, the team prefers detailed feedback for pull requests, bugs, and issues to provide as much context as possible.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:25:31.991Z
Learning: In the OmniBlocks/scratch-gui repository, when adding features to existing code, follow the surrounding naming patterns (camelCase, snake_case, or kebab-case) rather than introducing new conventions.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-28T03:54:03.336Z
Learning: OmniBlocks/scratch-gui preference: supervoidcoder wants energetic, playful tone in CI sticky comments (emojis, fun copy), while preserving single-comment strategy and not @-mentioning bots.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-13T22:43:34.163Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder prefers React over Svelte for UI development (React is the framework they know and want to use consistently).

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-02T20:01:55.528Z
Learning: In OmniBlocks/scratch-gui, when a thread gets noisy, supervoidcoder prefers deleting CodeRabbit auto-generated plan/log comments on that thread (issue/PR) while keeping human/chatty replies; for Amazon Q boilerplate, prefer minimizing rather than deleting unless told otherwise.

---

Learnt from: 8to16
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T16:41:25.038Z
Learning: In OmniBlocks/scratch-gui, user 8to16 (ampelectrecuted) does not want CodeRabbit to use [plan_code_changes] mode or agent features, similar to supervoidcoder's preference. Only use normal chat responses unless explicitly requested otherwise.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T02:32:52.161Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder does not want CodeRabbit to use [plan_code_changes] mode unless explicitly requested. Plan mode should only be activated when the user specifically asks for code changes or PR creation.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T23:09:09.556Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder explicitly wants CodeRabbit to never use [plan_code_changes] or "plan mode" unless they ask for it; when they request code, paste the full file or diff directly in the comment without invoking plan mode.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T21:20:08.837Z
Learning: In the OmniBlocks/scratch-gui repository, supervoidcoder (“void”) prefers single, complete PRs over multi-part (“Part 1/2”) submissions. If a split is unavoidable, they want explicit linkage and gating before approval.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-29T02:07:23.513Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder has identified that moving save/load logic and potentially VM operations to web workers is a priority to prevent main thread blocking, especially for large 1GB+ projects and infinite clone scenarios that can freeze the GUI.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T18:13:12.365Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder expressed concern that using a single .omb file format with metadata to distinguish between single-language and multi-language projects might be confusing for users, despite being more robust technically.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:25:31.991Z
Learning: In the OmniBlocks/scratch-gui repository, performance should be reasonable and not cause lag or slowdowns, but code doesn't need to be hyper-optimized to squeeze out every nanosecond.

---

Learnt from: Graison-P
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-03T20:43:51.190Z
Learning: In OmniBlocks/scratch-gui, the team has decided to use multiple project file formats (.omb for blocks-only, .omml for multi-language, .ompy for Python, .omjs for JavaScript, .omc for C, etc.) rather than a single .omb format with metadata. Each language will have its own project extension, with format detection and migration handling when users add/remove languages from projects.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T01:50:09.301Z
Learning: In OmniBlocks/scratch-gui, for the IDE expansion supporting multiple programming languages (Python, JavaScript, C, etc.), the project will use a single `.omb` format for full project bundles that contains metadata specifying languages, project structure, and assets. Individual code files will use standard language extensions (.py, .js, .c) rather than custom extensions like `.pyboxy`. The `.omb` format is a zip archive containing code/, assets/, blocks/ directories plus project.json metadata.

[supervoidcoder]

@coderabbitai ccould ou try again

[coderabbitai]

Tip

For best results, initiate chat on the files or code changes.

🧩 Analysis chain

@supervoidcoder Let me try a different approach to access the scratch-vm repo!

---

🏁 Script executed:

#!/bin/bash
# First, verify we can access the repo at all
echo "=== Checking repository accessibility ==="
gh api /repos/OmniBlocks/scratch-vm --jq '{name: .name, private: .private, default_branch: .default_branch}' 2>&1

echo -e "\n=== Listing src/extensions directory ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/extensions 2>&1 | jq -r '.[] | select(.type=="file" or .type=="dir") | "\(.type): \(.name)"' | head -30

echo -e "\n=== Fetching extension-manager.js ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/extension-support/extension-manager.js 2>&1 | jq -r '.content' | base64 -d > /tmp/ext-manager.js
head -300 /tmp/ext-manager.js

echo -e "\n=== Fetching runtime.js for target methods ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/engine/runtime.js 2>&1 | jq -r '.content' | base64 -d > /tmp/runtime.js
# Look for target/sprite management methods
grep -n "^\s*\(addTarget\|disposeTarget\|deleteTarget\|duplicateSprite\)" /tmp/runtime.js | head -20

echo -e "\n=== Target management method implementations ==="
grep -A 30 "^\s*addTarget\s*(" /tmp/runtime.js | head -40
grep -A 30 "^\s*disposeTarget\s*(" /tmp/runtime.js | head -40

echo -e "\n=== Sample Extension (Pen) ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/extensions/scratch3_pen/index.js 2>&1 | jq -r '.content' | base64 -d | head -200

Length of output: 23863

---

@supervoidcoder Perfect! 🎉 Got into the VM this time. Here's what I found:

🔍 Extension System Architecture

Your VM uses a pretty standard Scratch extension pattern. Looking at the Pen extension as a reference:

class Scratch3PenBlocks {
    constructor(runtime) {
        this.runtime = runtime;
        // Setup event listeners, initialize state
        runtime.on('targetWasCreated', this._onTargetCreated);
    }

    getInfo() {
        return {
            id: 'pen',
            name: 'Pen',
            blocks: [/* block definitions */],
            menus: {/* menu definitions */}
        };
    }
    
    // Block implementations...
}

🎯 Key VM Methods for Sprite Management

Found exactly what you need in runtime.js:

Adding sprites:

addTarget(target) {
    this.targets.push(target);
    this.executableTargets.push(target);
    if (target.isStage && !this._stageTarget) {
        this._stageTarget = target;
    }
}

Removing sprites:

disposeTarget(disposingTarget) {
    this.targets = this.targets.filter(target => {
        if (disposingTarget !== target) return true;
        // Allow target to do dispose actions.
        target.dispose();
        // Remove from list of targets.
        return false;
    });
    if (this._stageTarget === disposingTarget) {
        this._stageTarget = null;
    }
}

💡 Your Dynamic Loading Extension (MVP Sketch)

class DynamicSpriteLoader {
    constructor(runtime) {
        this.runtime = runtime;
        // Store serialized sprites here (in-memory for MVP)
        this.spriteStorage = {};
    }

    getInfo() {
        return {
            id: 'dynamicloader',
            name: 'Dynamic Loading',
            color1: '#FF6680',
            color2: '#FF4D6A',
            blocks: [
                {
                    opcode: 'unloadSprite',
                    blockType: 'command',
                    text: 'unload sprite [SPRITE]',
                    arguments: {
                        SPRITE: {
                            type: 'string',
                            menu: 'sprites'
                        }
                    }
                },
                {
                    opcode: 'loadSprite',
                    blockType: 'command',
                    text: 'load sprite [NAME]',
                    arguments: {
                        NAME: {
                            type: 'string',
                            defaultValue: 'Sprite1'
                        }
                    }
                },
                {
                    opcode: 'isSpriteLoaded',
                    blockType: 'Boolean',
                    text: 'is sprite [NAME] loaded?',
                    arguments: {
                        NAME: {
                            type: 'string',
                            defaultValue: 'Sprite1'
                        }
                    }
                }
            ],
            menus: {
                sprites: {
                    acceptReporters: true,
                    items: '_getSprites'
                }
            }
        };
    }

    _getSprites() {
        return this.runtime.targets
            .filter(t => !t.isStage)
            .map(t => t.getName());
    }

    unloadSprite(args, util) {
        const spriteName = args.SPRITE;
        const target = this.runtime.getSpriteTargetByName(spriteName);
        
        if (!target) {
            console.warn(`Sprite ${spriteName} not found`);
            return;
        }

        // Serialize the sprite before disposing
        // This is the key part - you'll need to serialize costumes, sounds, variables, etc.
        this.spriteStorage[spriteName] = target.toJSON();
        
        // Remove from runtime
        this.runtime.disposeTarget(target);
        
        console.log(`✅ Unloaded ${spriteName}, freed RAM`);
    }

    loadSprite(args, util) {
        const spriteName = args.NAME;
        
        if (!this.spriteStorage[spriteName]) {
            console.warn(`No stored data for sprite ${spriteName}`);
            return;
        }

        // Deserialize and add back to runtime
        const spriteData = this.spriteStorage[spriteName];
        const sprite = this.runtime.deserializeTarget(spriteData);
        this.runtime.addTarget(sprite);
        
        console.log(`✅ Loaded ${spriteName} back into RAM`);
    }

    isSpriteLoaded(args, util) {
        const spriteName = args.NAME;
        return this.runtime.getSpriteTargetByName(spriteName) !== null;
    }
}

🗄️ Storage Strategy Considerations

For MVP (simplest):

• In-memory storage (this.spriteStorage = {})
• Lost on page refresh, but immediate RAM savings
• No persistence, but proves the concept

For production:

• IndexedDB: Best for large sprites (handles blobs well)
• localStorage: Quick but 5-10MB limit
• External files: .omb could store "inactive" sprites separately

⚠️ Things to Figure Out

1. Serialization: Does target.toJSON() exist in your VM? You might need to write a custom serializer that captures:

   • Costumes/sounds (binary data!)
   • Variables and lists
   • Block state
   • Position, size, effects

2. Deserialization: Reverse process - probably need to look at how VM loads sprites from .sb3 files

3. Clone handling: What happens to clones when parent sprite unloads?

4. Script execution: Stop all threads for that sprite before unloading

🚀 Next Steps

Want me to:

1. Search for toJSON / serialization methods in your VM?
2. Look at how .sb3 loading works to understand sprite deserialization?
3. Sketch out a full implementation with proper serialization?

This aligns perfectly with your web worker plans - serialize/deserialize can happen off main thread! 🎊

((\
( -.-)
o_(")(")
curious rabbit analyzing code

---

🧠 Learnings used

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T01:45:53.675Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder is planning to expand OmniBlocks from a Scratch mod into a full IDE, requiring support for multiple file types beyond just block-based projects. The primary project format will use the `.omb` extension, with potential for additional extensions in the `omb` namespace (e.g., `.ombc`, `.ombs`) as IDE features are added.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-29T02:07:23.513Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder has identified that moving save/load logic and potentially VM operations to web workers is a priority to prevent main thread blocking, especially for large 1GB+ projects and infinite clone scenarios that can freeze the GUI.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T23:09:09.556Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder explicitly wants CodeRabbit to never use [plan_code_changes] or "plan mode" unless they ask for it; when they request code, paste the full file or diff directly in the comment without invoking plan mode.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T02:32:52.161Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder does not want CodeRabbit to use [plan_code_changes] mode unless explicitly requested. Plan mode should only be activated when the user specifically asks for code changes or PR creation.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-01T12:10:19.386Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder prefers a division of labor where Amazon Q handles fast review for ethics and project vision concerns, while CodeRabbit performs deep technical review of code quality, security, architecture, and implementation details.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T18:13:12.365Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder expressed concern that using a single .omb file format with metadata to distinguish between single-language and multi-language projects might be confusing for users, despite being more robust technically.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-28T03:54:03.336Z
Learning: OmniBlocks/scratch-gui preference: supervoidcoder wants energetic, playful tone in CI sticky comments (emojis, fun copy), while preserving single-comment strategy and not @-mentioning bots.

---

Learnt from: 8to16
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T16:41:25.038Z
Learning: In OmniBlocks/scratch-gui, user 8to16 (ampelectrecuted) does not want CodeRabbit to use [plan_code_changes] mode or agent features, similar to supervoidcoder's preference. Only use normal chat responses unless explicitly requested otherwise.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-11T21:39:58.878Z
Learning: In OmniBlocks/scratch-gui, CodeRabbit must not claim to have edited repository files or committed changes. Scripts run in a sandbox environment and can read/analyze code, but file modifications are not persisted to the repository. Only provide manual steps or code/diff when asked, never imply repository changes occurred.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-05T01:48:23.435Z
Learning: OmniBlocks/scratch-gui workflow preference: Open tracking issues for CI/automation behavior changes; assign to supervoidcoder; include backlinks to the PR and the exact comment requesting the change.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:01:57.123Z
Learning: In the OmniBlocks/scratch-gui repository, team member supervoidcoder can be called "void" in reviews and conversations.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-13T22:43:34.163Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder prefers React over Svelte for UI development (React is the framework they know and want to use consistently).

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 519
File: src/playground/index.ejs:176-176
Timestamp: 2025-12-05T17:47:27.981Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder's Scratch username is scratchcode1_2_3.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-02T20:01:55.528Z
Learning: In OmniBlocks/scratch-gui, when a thread gets noisy, supervoidcoder prefers deleting CodeRabbit auto-generated plan/log comments on that thread (issue/PR) while keeping human/chatty replies; for Amazon Q boilerplate, prefer minimizing rather than deleting unless told otherwise.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T21:20:08.837Z
Learning: In the OmniBlocks/scratch-gui repository, supervoidcoder (“void”) prefers single, complete PRs over multi-part (“Part 1/2”) submissions. If a split is unavoidable, they want explicit linkage and gating before approval.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-09T21:20:10.083Z
Learning: OmniBlocks scratch-vm must initialize runtime.extensionRuntimeOptions before loading extensions (e.g., in VM constructor or Runtime constructor) to avoid crashes when the extension reads .javascriptUnsandboxed, matching PenguinMod/TurboWarp behavior.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:25:31.991Z
Learning: In the OmniBlocks/scratch-gui repository, performance should be reasonable and not cause lag or slowdowns, but code doesn't need to be hyper-optimized to squeeze out every nanosecond.

---

Learnt from: Graison-P
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-03T20:43:51.190Z
Learning: In OmniBlocks/scratch-gui, the team has decided to use multiple project file formats (.omb for blocks-only, .omml for multi-language, .ompy for Python, .omjs for JavaScript, .omc for C, etc.) rather than a single .omb format with metadata. Each language will have its own project extension, with format detection and migration handling when users add/remove languages from projects.

---

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T01:50:09.301Z
Learning: In OmniBlocks/scratch-gui, for the IDE expansion supporting multiple programming languages (Python, JavaScript, C, etc.), the project will use a single `.omb` format for full project bundles that contains metadata specifying languages, project structure, and assets. Individual code files will use standard language extensions (.py, .js, .c) rather than custom extensions like `.pyboxy`. The `.omb` format is a zip archive containing code/, assets/, blocks/ directories plus project.json metadata.

[supervoidcoder]

@coderabbitai umn why do you need to sserialize nything? .sprite3 a'ready exists

[coderabbitai]

Tip

For best results, initiate chat on the files or code changes.

🧩 Analysis chain

🏁 Script executed:

#!/bin/bash
# Search for sprite export/import methods in scratch-vm
echo "=== Looking for sprite export methods ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/virtual-machine.js | jq -r '.content' | base64 -d > /tmp/vm.js
grep -n "export.*[Ss]prite\|import.*[Ss]prite\|toJSON\|fromJSON" /tmp/vm.js | head -30

echo -e "\n=== Searching for exportSprite in codebase ==="
gh api "/search/code?q=repo:OmniBlocks/scratch-vm+exportSprite+in:file" | jq -r '.items[] | "\(.path)"' 2>/dev/null | head -10

echo -e "\n=== Searching for sprite serialization ==="
gh api "/search/code?q=repo:OmniBlocks/scratch-vm+sprite.toJSON+in:file" | jq -r '.items[] | "\(.path)"' 2>/dev/null | head -10

echo -e "\n=== Looking at target.js for toJSON method ==="
gh api /repos/OmniBlocks/scratch-vm/contents/src/sprites/target.js | jq -r '.content' | base64 -d > /tmp/target.js
grep -n "toJSON" /tmp/target.js -A 20 | head -50

echo -e "\n=== Checking for sprite import/export in VM ==="
grep -n "exportSprite\|importSprite\|addSprite\|saveSprite" /tmp/vm.js -A 5 | head -50

echo -e "\n=== Looking for sb3 loading/saving logic ==="
gh api "/search/code?q=repo:OmniBlocks/scratch-vm+deserialize+sprite+in:file" | jq -r '.items[] | "\(.path)"' 2>/dev/null | head -10

Length of output: 3076

---

@supervoidcoder You're absolutely right! 🤦 Much simpler approach - the VM already has everything we need:

📦 VM Methods Found

exportSprite(targetId, optZipType) (line 686):

exportSprite (targetId, optZipType) {
    const spriteJson = this.toJSON(targetId);
    const zip = new JSZip();
    zip.file('sprite.json', spriteJson);
    this._addFileDescsToZip(this.serializeAssets(targetId), zip);
    // Returns sprite3 blob
}

addSprite(input) (line 860) / _addSprite3(sprite, zip) (line 930):

_addSprite3 (sprite, zip) {
    const sb3 = require('./serialization/sb3');
    return sb3
        .deserialize(sprite, this.runtime, zip, true)
        .then(({targets, extensions}) => this.installTargets(targets, extensions, false));
}

✨ Simplified Extension (using .sprite3)

class DynamicSpriteLoader {
    constructor(runtime) {
        this.runtime = runtime;
        this.vm = runtime.vm; // Need VM reference
        // Store sprite3 blobs (ArrayBuffers)
        this.spriteStorage = new Map();
    }

    getInfo() {
        return {
            id: 'dynamicloader',
            name: 'Dynamic Loading',
            color1: '#FF6680',
            color2: '#FF4D6A',
            blocks: [
                {
                    opcode: 'unloadSprite',
                    blockType: 'command',
                    text: 'unload sprite [SPRITE]',
                    arguments: {
                        SPRITE: {
                            type: 'string',
                            menu: 'sprites'
                        }
                    }
                },
                {
                    opcode: 'loadSprite',
                    blockType: 'command',
                    text: 'load sprite [NAME]',
                    arguments: {
                        NAME: {
                            type: 'string',
                            defaultValue: 'Sprite1'
                        }
                    }
                },
                {
                    opcode: 'isSpriteLoaded',
                    blockType: 'Boolean',
                    text: 'is sprite [NAME] loaded?',
                    arguments: {
                        NAME: {
                            type: 'string',
                            defaultValue: 'Sprite1'
                        }
                    }
                }
            ],
            menus: {
                sprites: {
                    acceptReporters: true,
                    items: '_getSprites'
                }
            }
        };
    }

    _getSprites() {
        return this.runtime.targets
            .filter(t => !t.isStage)
            .map(t => t.getName());
    }

    async unloadSprite(args, util) {
        const spriteName = args.SPRITE;
        const target = this.runtime.getSpriteTargetByName(spriteName);
        
        if (!target) {
            console.warn(`Sprite ${spriteName} not found`);
            return;
        }

        // Export sprite as .sprite3 (returns Promise<Uint8Array>)
        const spriteBlob = await this.vm.exportSprite(target.id, 'uint8array');
        
        // Store the sprite3 blob
        this.spriteStorage.set(spriteName, spriteBlob);
        
        // Remove from runtime
        this.runtime.disposeTarget(target);
        
        console.log(`✅ Unloaded ${spriteName}, saved as .sprite3`);
    }

    async loadSprite(args, util) {
        const spriteName = args.NAME;
        
        if (!this.spriteStorage.has(spriteName)) {
            console.warn(`No stored .sprite3 for sprite ${spriteName}`);
            return;
        }

        // Get stored sprite3 blob
        const spriteBlob = this.spriteStorage.get(spriteName);
        
        // Import sprite back into VM
        await this.vm.addSprite(spriteBlob);
        
        console.log(`✅ Loaded ${spriteName} from .sprite3`);
    }

    isSpriteLoaded(args, util) {
        const spriteName = args.NAME;
        return this.runtime.getSpriteTargetByName(spriteName) !== null;
    }
}

🗄️ Storage Upgrade Path

MVP (in-memory):

this.spriteStorage = new Map(); // Lost on refresh

Production (IndexedDB persistence):

// Store sprite3 blobs in IndexedDB
const db = await openDB('OmniBlocks-Sprites', 1);
await db.put('sprites', spriteBlob, spriteName);

No custom serialization needed - the VM handles everything! Way cleaner. 🎉

---

✏️ Learnings added

Learnt from: supervoidcoder
URL: https://github.com/OmniBlocks/scratch-gui/issues/709

Timestamp: 2026-01-13T15:34:53.042Z
Learning: In OmniBlocks/scratch-vm, sprite export/import already exists: `vm.exportSprite(targetId, 'uint8array')` exports a sprite as .sprite3 format (ZIP with sprite.json + assets), and `vm.addSprite(blob)` imports it back. No custom serialization needed for dynamic sprite loading - use the built-in .sprite3 format.

Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.

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🧠 Learnings used

Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-09T21:20:10.083Z
Learning: OmniBlocks scratch-vm must initialize runtime.extensionRuntimeOptions before loading extensions (e.g., in VM constructor or Runtime constructor) to avoid crashes when the extension reads .javascriptUnsandboxed, matching PenguinMod/TurboWarp behavior.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-09T13:04:39.893Z
Learning: In OmniBlocks scratch-vm, initialize `this.runtime.extensionRuntimeOptions = {}` in the VM constructor (before loading extensions) to match PM/TW; otherwise SPjavascriptV2 crashes when reading `.javascriptUnsandboxed` during normal (non-packager) runs.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-29T02:07:23.513Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder has identified that moving save/load logic and potentially VM operations to web workers is a priority to prevent main thread blocking, especially for large 1GB+ projects and infinite clone scenarios that can freeze the GUI.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-06T23:37:51.374Z
Learning: In OmniBlocks scratch-gui, custom extension library items must include `extensionURL`; otherwise the loader tries to load `extensionId` as a URL/built-in id and fails.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-06T23:37:51.374Z
Learning: The public SPjavascriptV2 (SharkPool) code found online uses CommonJS `require`, which won’t load via TurboWarp’s `loadExtensionURL`. It must be converted to a browser/TurboWarp extension that registers via `Scratch.extensions.register`.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T18:13:12.365Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder expressed concern that using a single .omb file format with metadata to distinguish between single-language and multi-language projects might be confusing for users, despite being more robust technically.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T01:45:53.675Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder is planning to expand OmniBlocks from a Scratch mod into a full IDE, requiring support for multiple file types beyond just block-based projects. The primary project format will use the `.omb` extension, with potential for additional extensions in the `omb` namespace (e.g., `.ombc`, `.ombs`) as IDE features are added.

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Learnt from: 8to16
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T16:39:43.656Z
Learning: OmniBlocks/scratch-gui PR #607 (January 2026): Amazon Q was asked to "Add Boxy to Sprite Library" but created a complete disaster: (1) rewrote entire app from scratch removing 1,782 net lines, (2) broke build with webpack 4→5 migration and dependency hell, (3) never modified sprites.json to actually register the sprite, (4) created a generic flat 48×48px AI-generated "box with smiley face" instead of using the real detailed 270×280px OmniBlocks Boxy mascot that already existed in src/lib/default-project/Boxy.svg with brand gradient (#0067bb→#00ba87), pixelated yellow eyes, and robot design. Task should have been: add 4 SVG files + one sprites.json entry.
<!-- [add_learning]
In OmniBlocks/scratch-gui, the real Boxy mascot is a detailed 270×280px robot character with OmniBlocks brand gradient (#0067bb blue → #00ba87 aqua), yellow pixelated rectangle eyes (#ffcd00), green rectangular mouth (#00ff2a), two antenna arms, and indicator lights. Located at src/lib/default-project/Boxy.svg with animated variations at src/components/menu-bar/Boxy-advanced*.svg. It's NOT a generic flat smiley-face box.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-11T21:39:58.878Z
Learning: In OmniBlocks/scratch-gui, CodeRabbit must not claim to have edited repository files or committed changes. Scripts run in a sandbox environment and can read/analyze code, but file modifications are not persisted to the repository. Only provide manual steps or code/diff when asked, never imply repository changes occurred.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T23:09:09.556Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder explicitly wants CodeRabbit to never use [plan_code_changes] or "plan mode" unless they ask for it; when they request code, paste the full file or diff directly in the comment without invoking plan mode.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-20T01:50:09.301Z
Learning: In OmniBlocks/scratch-gui, for the IDE expansion supporting multiple programming languages (Python, JavaScript, C, etc.), the project will use a single `.omb` format for full project bundles that contains metadata specifying languages, project structure, and assets. Individual code files will use standard language extensions (.py, .js, .c) rather than custom extensions like `.pyboxy`. The `.omb` format is a zip archive containing code/, assets/, blocks/ directories plus project.json metadata.

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Learnt from: 8to16
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T16:41:25.038Z
Learning: In OmniBlocks/scratch-gui, user 8to16 (ampelectrecuted) does not want CodeRabbit to use [plan_code_changes] mode or agent features, similar to supervoidcoder's preference. Only use normal chat responses unless explicitly requested otherwise.

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Learnt from: Graison-P
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-03T20:43:51.190Z
Learning: In OmniBlocks/scratch-gui, the team has decided to use multiple project file formats (.omb for blocks-only, .omml for multi-language, .ompy for Python, .omjs for JavaScript, .omc for C, etc.) rather than a single .omb format with metadata. Each language will have its own project extension, with format detection and migration handling when users add/remove languages from projects.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-01T12:10:19.386Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder prefers a division of labor where Amazon Q handles fast review for ethics and project vision concerns, while CodeRabbit performs deep technical review of code quality, security, architecture, and implementation details.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:01:57.123Z
Learning: In the OmniBlocks/scratch-gui repository, team member supervoidcoder can be called "void" in reviews and conversations.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-11-28T03:54:03.336Z
Learning: OmniBlocks/scratch-gui preference: supervoidcoder wants energetic, playful tone in CI sticky comments (emojis, fun copy), while preserving single-comment strategy and not @-mentioning bots.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-12-13T22:43:34.163Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder prefers React over Svelte for UI development (React is the framework they know and want to use consistently).

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 519
File: src/playground/index.ejs:176-176
Timestamp: 2025-12-05T17:47:27.981Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder's Scratch username is scratchcode1_2_3.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-02T20:01:55.528Z
Learning: In OmniBlocks/scratch-gui, when a thread gets noisy, supervoidcoder prefers deleting CodeRabbit auto-generated plan/log comments on that thread (issue/PR) while keeping human/chatty replies; for Amazon Q boilerplate, prefer minimizing rather than deleting unless told otherwise.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2026-01-10T02:32:52.161Z
Learning: In OmniBlocks/scratch-gui, supervoidcoder does not want CodeRabbit to use [plan_code_changes] mode unless explicitly requested. Plan mode should only be activated when the user specifically asks for code changes or PR creation.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T21:20:08.837Z
Learning: In the OmniBlocks/scratch-gui repository, supervoidcoder (“void”) prefers single, complete PRs over multi-part (“Part 1/2”) submissions. If a split is unavoidable, they want explicit linkage and gating before approval.

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Learnt from: supervoidcoder
Repo: OmniBlocks/scratch-gui PR: 0
File: :0-0
Timestamp: 2025-10-22T19:25:31.991Z
Learning: In the OmniBlocks/scratch-gui repository, performance should be reasonable and not cause lag or slowdowns, but code doesn't need to be hyper-optimized to squeeze out every nanosecond.