Interactive development mode and shell REPL

[konard]

Goal: Provide the best developer experience for shell scripting

Features No Competitor Has:

1. Interactive Development Mode:

// Auto-restart on file changes
$.dev({
  watch: ['./scripts/*.mjs'],
  repl: true
});

2. Shell REPL:

$ npx command-stream repl
> $`ls`
# Interactive results with autocomplete
> $.register('deploy', deployFn)  
> deploy --env=staging

3. Visual Pipeline Debugger:

• Step-through pipeline execution
• Inspect data between pipeline stages
• Visual stream flow representation

4. Development Tools:

• Hot-reload virtual commands
• Pipeline visualization
• Performance profiling
• Memory usage tracking
• Command execution timeline

5. IDE Integration:

• VSCode extension with syntax highlighting
• Autocomplete for virtual commands
• Inline documentation
• Error highlighting

6. Testing Framework:

• Built-in test utilities
• Mock command system
• Pipeline testing helpers
• Snapshot testing for outputs

Competitive Advantage:

• Interactive development workflow
• Visual debugging tools
• IDE integration
• Built-in testing framework

Success Metrics:

• IDE extension downloads
• Developer feedback on REPL
• Testing framework adoption