extension.js

// The module 'vscode' contains the VS Code extensibility API
// Import the module and reference it with the alias vscode in your code below
const vscode = require('vscode');
const csb = require('codesandboxer-fs');

// this method is called when your extension is activated
// your extension is activated the very first time the command is executed
function activate(context) {
  // The command has been defined in the package.json file
  // Now provide the implementation of the command with  registerCommand
  // The commandId parameter must match the command field in package.json
  let disposable = vscode.commands.registerCommand(
    'extension.vs-codesandboxer',
    function() {
      // The code you place here will be executed every time your command is executed
      // Display a message box to the user
      let filePath = vscode.window.activeTextEditor.document.fileName;

      vscode.window.showInformationMessage('uploading to codesandbox...');

      csb
        .assembleFilesAndPost(filePath)
        .then(sandboxInfo => {
          vscode.window.showInformationMessage(
            `[Open file in codesandbox](${sandboxInfo.sandboxUrl})`
          );
        })
        .catch(e => {
          vscode.window.showErrorMessage(
            `Error deploying to codesandbox: ${e}`
          );
          console.log('an error was thrown', e);
        });
    }
  );

  context.subscriptions.push(disposable);
}
exports.activate = activate;