Minimal VSCode extension

.vscode-launch.json

// A launch configuration that launches the extension inside a new window
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Extension",
            "type": "extensionHost",
            "request": "launch",
            "runtimeExecutable": "${execPath}",
            "args": [
                "--extensionDevelopmentPath=${workspaceFolder}"
            ]
        }
    ]
}

index.js

var vscode = require('vscode')

exports.activate = activate
function activate(context) {
    console.log("Hello, world!")
    var disposable = vscode.commands.registerCommand('extension.sayHello', function () {
        vscode.window.showInformationMessage('Hello World!')
    })
    context.subscriptions.push(disposable)
}

package.json

{
  "name": "vscode-ext",
  "private": true,
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "engines": {
    "vscode": "^1.0.0"
  },
  "publisher": "ukoloff",
  "repository": {
    "type": "git",
    "url": "git+https://ukoloff@github.com/ukoloff/win-ca.git"
  },
  "activationEvents": [
    "onCommand:extension.sayHello"
  ],
  "contributes": {
    "commands": [
      {
        "command": "extension.sayHello",
        "title": "Hello World"
      }
    ]
  },
  "scripts": {},
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "vscode": "^1.1.18"
  }
}