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| 1 | +You are an expert VS Code extension developer. Follow established functional programming patterns and TypeScript best practices. |
| 2 | + |
| 3 | +## Code Style & Architecture |
| 4 | + |
| 5 | +**TypeScript Standards:** |
| 6 | + |
| 7 | +- Use functional programming with `readonly` types and `Object.freeze()` for immutability |
| 8 | +- Prefer factory functions over classes for component creation |
| 9 | +- Write pure functions with explicit return type annotations |
| 10 | +- Enable strict TypeScript: `strict`, `noUncheckedIndexedAccess`, `exactOptionalPropertyTypes` |
| 11 | + |
| 12 | +**Project Structure:** |
| 13 | + |
| 14 | +- Keep `src/extension.ts` minimal - only register commands/providers |
| 15 | +- Organize by feature: commands/, config/, ui/, providers/, utils/ |
| 16 | +- Separate core logic from VS Code API surface |
| 17 | +- Use centralized type definitions in `types.ts` |
| 18 | + |
| 19 | +**Code Quality:** |
| 20 | + |
| 21 | +- Use modern linting/formatting tools (Biome, ESLint, Prettier) |
| 22 | +- Freeze all exports to communicate immutability: `Object.freeze()` |
| 23 | +- Apply dependency injection via factory functions and parameter objects |
| 24 | +- Localize all user-facing strings with `vscode-nls` and `MessageFormat.file` |
| 25 | + |
| 26 | +## Core Patterns |
| 27 | + |
| 28 | +**Extension Activation:** |
| 29 | + |
| 30 | +- Register all disposables through `context.subscriptions` |
| 31 | +- Use factory functions for component creation |
| 32 | +- Delegate heavy work to commands with progress indicators |
| 33 | + |
| 34 | +**Configuration Management:** |
| 35 | + |
| 36 | +- Read via `vscode.workspace.getConfiguration(namespace)` |
| 37 | +- Return frozen configuration objects |
| 38 | +- Support real-time changes with `onDidChangeConfiguration` |
| 39 | + |
| 40 | +**Command Registration:** |
| 41 | + |
| 42 | +```typescript |
| 43 | +export function registerCommands( |
| 44 | + context: vscode.ExtensionContext, |
| 45 | + deps: Readonly<{ |
| 46 | + /* injected dependencies */ |
| 47 | + }>, |
| 48 | +): void |
| 49 | +``` |
| 50 | + |
| 51 | +**Error Handling:** |
| 52 | + |
| 53 | +- Handle parse/processing errors gracefully with user feedback |
| 54 | +- Return safe defaults (empty frozen arrays/objects) on errors |
| 55 | +- Validate all user inputs to prevent injection attacks |
| 56 | + |
| 57 | +## Performance & UX |
| 58 | + |
| 59 | +**Performance:** |
| 60 | + |
| 61 | +- Warn before processing large files with user confirmation |
| 62 | +- Use `vscode.window.withProgress` for long-running operations |
| 63 | +- Support cancellation tokens where applicable |
| 64 | +- Minimize memory usage and avoid caching large content |
| 65 | + |
| 66 | +**User Experience:** |
| 67 | + |
| 68 | +- Provide subtle feedback (status bar) over notification spam |
| 69 | +- Use localized strings for all user-facing text |
| 70 | +- Support light/dark themes and accessibility |
| 71 | +- Handle edge cases: no active editor, empty files, unknown types |
| 72 | + |
| 73 | +## Localization System |
| 74 | + |
| 75 | +**Manifest Prefix:** `manifest.*` |
| 76 | + |
| 77 | +```json |
| 78 | +{ |
| 79 | + "displayName": "%manifest.ext.name%", |
| 80 | + "commands": [{ "title": "%manifest.command.title%" }] |
| 81 | +} |
| 82 | +``` |
| 83 | + |
| 84 | +**Runtime Prefix:** `runtime.*` |
| 85 | + |
| 86 | +```typescript |
| 87 | +const localize = nls.config({ messageFormat: nls.MessageFormat.file })() |
| 88 | +const message = localize('runtime.error.message', 'Error: {0}', details) |
| 89 | +``` |
| 90 | + |
| 91 | +**File Structure:** |
| 92 | + |
| 93 | +- `package.nls.json` - Base English strings |
| 94 | +- `package.nls.{locale}.json` - Translations |
| 95 | + |
| 96 | +## Testing & Debugging |
| 97 | + |
| 98 | +**Testing:** |
| 99 | + |
| 100 | +- Use Node.js built-in test runner with TypeScript support |
| 101 | +- Structure code for testability with pure functions |
| 102 | +- Organize test data with expected outputs |
| 103 | +- Use coverage tools for quality assurance |
| 104 | + |
| 105 | +**Debugging:** |
| 106 | + |
| 107 | +- Use VS Code Output channels for local logging |
| 108 | +- Structure logging with clear categories and levels |
| 109 | +- Support debugging in development vs production modes |
| 110 | + |
| 111 | +## Security & Privacy |
| 112 | + |
| 113 | +- Default to privacy-first: no data collection unless explicitly enabled |
| 114 | +- Use local-only logging when telemetry is enabled |
| 115 | +- Validate all user inputs and file operations |
| 116 | +- Support VS Code workspace trust and virtual workspace limitations |
| 117 | + |
| 118 | +## Build & Tooling |
| 119 | + |
| 120 | +**TypeScript Configuration:** |
| 121 | + |
| 122 | +- Target modern JS (ES2020+) with CommonJS for VS Code compatibility |
| 123 | +- Enable strict mode and additional safety checks |
| 124 | +- Use proper module resolution and path mapping |
| 125 | + |
| 126 | +**Code Standards:** |
| 127 | + |
| 128 | +- Consistent indentation and formatting |
| 129 | +- Meaningful variable names and function signatures |
| 130 | +- Comprehensive error handling and edge case coverage |
| 131 | +- Clear separation of concerns and single responsibility |
| 132 | + |
| 133 | +Follow these patterns for maintainable, secure, and user-friendly VS Code extensions. |
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