Dev Undo Redo

FlowState Undo/Redo Unification

Instructions

MANDATORY: Use VueUse + Pinia System Only

ALWAYS use this exact pattern for FlowState undo/redo:

import { useManualRefHistory } from '@vueuse/core'

const {
  history,
  undo,
  redo,
  canUndo,
  canRedo,
  commit
} = useManualRefHistory(unifiedState, {
  capacity: 50,
  deep: true,
  clone: true
})

// Pattern: Save state before and after every change
const saveState = (description: string) => {
  commit() // VueUse handles everything
}

Implementation Rules

1. NEVER create custom undo/redo implementations
2. NEVER use manual JSON serialization
3. NEVER create multiple history managers
4. ALWAYS call saveState() before and after state changes
5. ALWAYS use the unified composable useUnifiedUndoRedo()
6. ALWAYS handle both stores (tasks, canvas, timer) in one system

Store Action Pattern

actions: {
  createTask(taskData: Partial<Task>) {
    const undoRedo = useUnifiedUndoRedo()
    undoRedo.saveState('Before task creation')

    // Your logic here
    this.tasks.push(newTask)

    undoRedo.saveState('After task creation')
    return newTask
  }
}

Component Pattern

<script setup>
const { canUndo, canRedo, undo, redo } = useUnifiedUndoRedo()

// Keyboard shortcuts handled automatically
// UI shows correct button states
</script>

<template>
  <button @click="undo" :disabled="!canUndo">↶ Undo</button>
  <button @click="redo" :disabled="!canRedo">↷ Redo</button>
</template>

This skill ensures ONE consistent undo/redo system across FlowState, eliminating all conflicts and providing reliable functionality.

Advanced Architecture Patterns

For complex applications requiring enhanced undo/redo capabilities, consider these advanced patterns:

Command Pattern Implementation

Use the Command Pattern for complex operations requiring granular control:

interface Command {
  execute(): void | Promise<void>
  undo(): void | Promise<void>
  getDescription(): string
  canExecute(): boolean
}

class OptimizedHistory {
  private undoStack: HistoryEntry[] = []
  private redoStack: HistoryEntry[] = []

  async execute(command: Command): Promise<void> {
    await command.execute()
    this.undoStack.push({ command, timestamp: Date.now() })
    this.redoStack = []
    this.optimizeMemory()
  }
}

Application-Specific Commands

Create domain-specific commands for all mutable operations:

// Task Management Commands
class CreateTaskCommand extends BaseCommand {
  constructor(private taskStore: any, private taskData: any) {
    super(`Create task: ${taskData.title}`)
  }

  async execute(): Promise<void> {
    this.generatedId = await this.taskStore.createTask(this.taskData)
  }

  async undo(): Promise<void> {
    if (this.generatedId) {
      await this.taskStore.deleteTask(this.generatedId)
    }
  }
}

// Canvas Interaction Commands
class MoveNodeCommand extends BaseCommand {
  constructor(
    private canvasStore: any,
    private nodeId: string,
    private fromPos: Position,
    private toPos: Position
  ) {
    super(`Move node ${nodeId}`)
  }

  async execute(): Promise<void> {
    await this.canvasStore.updateNodePosition(this.nodeId, this.toPos)
  }

  async undo(): Promise<void> {
    await this.canvasStore.updateNodePosition(this.nodeId, this.fromPos)
  }
}

Performance Optimizations

For large-scale applications, implement these optimizations:

Memory Management

• Automatic cleanup of old history entries
• Delta compression for state changes
• Circular buffer for fixed-size history

Batch Operations

• Group related operations into single commands
• Transaction-like behavior for complex changes
• Rollback capability for failed operations

Asynchronous Operations

• Support for async/await in command execution
• Progress tracking for long-running operations
• Error recovery and retry mechanisms

Key Requirements for Advanced Systems

• Always implement both execute() and undo() methods
• Use async/await for operations that might be slow
• Include descriptive messages for debugging and user feedback
• Handle circular references in state serialization
• Implement memory management for large histories
• Use delta compression for performance optimization

Common Advanced Patterns

• Batch Commands: Group related operations together
• Checkpoint Commands: Create application state snapshots
• Delta Storage: Store only changes, not full state
• Memory Management: Automatic cleanup and compression
• Error Recovery: Graceful handling of failed operations

When to Use Advanced Patterns

Use Command Pattern and advanced architecture when:

• Building new undo/redo systems from scratch
• Need granular control over individual operations
• Working with complex state changes across multiple stores
• Implementing transaction-like behavior
• Requiring advanced memory management and optimization

When to Use VueUse + Pinia

Use the VueUse approach (from primary section above) when:

• Fixing existing FlowState undo/redo issues
• Working with Vue 3 + Pinia stack
• Need rapid implementation with proven patterns
• Managing state within single store or related stores
• Prioritizing development speed over architectural complexity

This comprehensive approach ensures robust, scalable undo/redo systems that maintain consistency across complex applications while optimizing performance and memory usage.

MANDATORY USER VERIFICATION REQUIREMENT

Policy: No Fix Claims Without User Confirmation

CRITICAL: Before claiming ANY issue, bug, or problem is "fixed", "resolved", "working", or "complete", the following verification protocol is MANDATORY:

Step 1: Technical Verification

• Run all relevant tests (build, type-check, unit tests)
• Verify no console errors
• Take screenshots/evidence of the fix

Step 2: User Verification Request

REQUIRED: Use the AskUserQuestion tool to explicitly ask the user to verify the fix:

"I've implemented [description of fix]. Before I mark this as complete, please verify:
1. [Specific thing to check #1]
2. [Specific thing to check #2]
3. Does this fix the issue you were experiencing?

Please confirm the fix works as expected, or let me know what's still not working."

Step 3: Wait for User Confirmation

• DO NOT proceed with claims of success until user responds
• DO NOT mark tasks as "completed" without user confirmation
• DO NOT use phrases like "fixed", "resolved", "working" without user verification

Step 4: Handle User Feedback

• If user confirms: Document the fix and mark as complete
• If user reports issues: Continue debugging, repeat verification cycle

Prohibited Actions (Without User Verification)

• Claiming a bug is "fixed"
• Stating functionality is "working"
• Marking issues as "resolved"
• Declaring features as "complete"
• Any success claims about fixes

Required Evidence Before User Verification Request

1. Technical tests passing
2. Visual confirmation via Playwright/screenshots
3. Specific test scenarios executed
4. Clear description of what was changed

Remember: The user is the final authority on whether something is fixed. No exceptions.