VS Code Extension Guide

Create, develop, and publish VS Code extensions.

When to Use

• VS Code extension, extension development, vscode plugin
• Creating a new VS Code extension from scratch
• Adding commands, keybindings, or settings to an extension
• Publishing to VS Code Marketplace

Quick Start

# Scaffold new extension (recommended)
npm install -g yo generator-code
yo code

# Or minimal manual setup
mkdir my-extension && cd my-extension
npm init -y && npm install -D typescript @types/vscode

Project Structure

my-extension/
├── package.json          # Extension manifest (CRITICAL)
├── src/extension.ts      # Entry point
├── out/                  # Compiled JS (gitignore)
├── images/icon.png       # 128x128 PNG for Marketplace
└── .vscodeignore         # Exclude files from VSIX

Building & Packaging

npm run compile      # Build once
npm run watch        # Watch mode (F5 to launch debug)
npx @vscode/vsce package   # Creates .vsix

Done Criteria

• [ ] Extension activates without errors
• [ ] All commands registered and working
• [ ] Package size < 5MB (use .vscodeignore)
• [ ] README.md includes Marketplace/GitHub links

Quick Troubleshooting

| Symptom | Fix | | --------------------- | -------------------------------------- | | Extension not loading | Add activationEvents to package.json | | Command not found | Match command ID in package.json/code | | Shortcut not working | Remove when clause, check conflicts |

| Topic | Reference | | ------------------- | -------------------------------------------------------------------- | | AI Customization | references/ai-customization.md | | Code Review Prompts | references/code-review-prompts.md | | Code Samples | references/code-samples.md | | TreeView | references/treeview.md | | Webview | references/webview.md | | Testing | references/testing.md | | Publishing | references/publishing.md | | Troubleshooting | references/troubleshooting.md |

Best Practices

命名の一貫性

公開前にパッケージ名・設定キー・コマンド名を統一：

| 項目 | 例 | |------|-----| | パッケージ名 | copilot-scheduler | | 設定キー | copilotScheduler.enabled | | コマンドID | copilotScheduler.createTask | | ビューID | copilotSchedulerTasks |

通知の一元管理

type NotificationMode = "sound" | "silentToast" | "silentStatus";

function getNotificationMode(): NotificationMode {
  const config = vscode.workspace.getConfiguration("myExtension");
  return config.get<NotificationMode>("notificationMode", "sound");
}

function notifyInfo(message: string, timeoutMs = 4000): void {
  const mode = getNotificationMode();
  switch (mode) {
    case "silentStatus":
      vscode.window.setStatusBarMessage(message, timeoutMs);
      break;
    case "silentToast":
      void vscode.window.withProgress(
        { location: vscode.ProgressLocation.Notification, title: message },
        async () => {},
      );
      break;
    default:
      void vscode.window.showInformationMessage(message);
  }
}

function notifyError(message: string, timeoutMs = 6000): void {
  const mode = getNotificationMode();
  if (mode === "silentStatus") {
    vscode.window.setStatusBarMessage(`⚠ ${message}`, timeoutMs);
    console.error(message);
    return;
  }
  void vscode.window.showErrorMessage(message);
}

設定で notificationMode を選べるようにすることで、ユーザーが通知音を制御可能。