帮我写一个Visual Studio Code的难度中等的题加答案

题目：编写一个简单的VSCode插件

任务：编写一个Visual Studio Code (VSCode) 插件，该插件的功能是在用户按下特定键（如 `Ctrl+Shift+A`）时，在当前编辑器光标所在行的正上方插入一行注释。插件应该支持跨语言，并且能识别常见的注释语法。

**答案示例**（使用TypeScript编写，假设使用的是vscode API）：

1. 创建一个新的VSCode插件项目：

mkdir my-comment-extension
cd my-comment-extension
npm init -y
npm install --save vscode

2. 编写`extension.ts`文件：

import * as vscode from 'vscode';

export function activate(context: vscode.ExtensionContext) {
    const disposable = vscode.commands.registerCommand('extension.insertComment', async () => {
        const editor = vscode.window.activeTextEditor;
        if (!editor) return;

        const line = editor.selection.start.line;
        const text = await editor.document.getText(rangeOfLine(line));
        let commentStart = '';
        
        // 检查语言并选择适当的注释开始符
        const languageId = editor.document.languageId;
        switch (languageId) {
            case 'javascript':
                commentStart = '//';
                break;
            case 'python':
                commentStart = '#';
                break;
            // 添加更多语言判断...
            default:
                throw new Error(`Unsupported language: ${languageId}`);
        }

        const commentRange = new vscode.Range(line, 0, line + 1, 0);
        editor.edit(editBuilder => {
            editBuilder.insert(commentRange, `${commentStart} ${text}\n`);
        });
    });

    context.subscriptions.push(disposable);
}

function rangeOfLine(line: number): vscode.Range {
    return new vscode.Range(line, 0, line + 1, 0);
}

3. 更新`package.json`配置：

{
  "name": "my-comment-extension",
  "version": "0.0.1",
  "publisher": "your_username_here",
  "description": "A simple VSCode extension to insert comments",
  "main": "extension.ts",
  "scripts": {
    "build": "tsc",
    "watch": "tsc -w"
  },
  "contributes": {
    "commands": [
      {
        "command": "extension.insertComment",
        "title": "Insert Comment",
        "when": "editorTextFocus && vimMode == false"
      }
    ]
  },
  "devDependencies": {
    "typescript": "^4.7.2",
    "vscode": "^1.68.0"
  }
}

4. 使用`npm run watch`启动开发模式，然后在VSCode内尝试`Ctrl+Shift+A`快捷键。