Launch iTerm 2 with a predefined tab & split configuration using Apple's "Javascript for Automation"

iterm-launcher.js

/**
 * AppleScript to launch iterm2 terminals/tabs with configurable:
 * ~ Name <name>
 * ~ List of commands <cmds>
 * ~ Split behavior horizontal(h) or vertical(v) <split> :: (h, v)
 *
 * Run from terminal with `osascript iterm-launcher.js`.
 * Don't unfocus with the mouse/keyboard while executing the script.
 *
 * JS port of https://github.com/luismartingil/scripts/blob/master/iterm_launcher02.applescript
 */
var layout = [
  [{
    name: 'Pane 1',
    cmds: ['echo 1', 'ls'],
    split: 'v'
  }, {
    name: 'Pane 2',
    cmds: ['echo 2', 'ls']
  }],
  [{
    name: 'Pane A',
    cmds: ['echo A', 'ls'],
    split: 'h'
  }, {
    name: 'Pane B',
    cmds: ['echo B', 'ls']
  }]
];

/****************************************************************/

var SystemEvents = Application('System Events');
var iTerm = Application('iTerm');

// Returns the last pane that was created in iTerm
function lastPane() {
  var len = iTerm.currentTerminal.sessions.length;
  return iTerm.currentTerminal.sessions[len - 1];
}

for (var i = 0; i < layout.length; i++) {
  var tabItem = layout[i];

  // Create a new tab
  iTerm.currentTerminal.launch({session: i + ''});

  for (var j = 0; j < tabItem.length; j++) {
    var paneItem = tabItem[j];

    // Initialize a new pane
    var pane = lastPane();
    pane.name = paneItem.name;

    // Run the commands
    for (var k = 0; k < paneItem.cmds.length; k++) {
      pane.write({text: paneItem.cmds[k]});
    }

    // Execute the split
    if ('split' in paneItem) {
      var splitChar = 'd';
      if (paneItem.split == 'h') {
        splitChar = 'D';
      }
      SystemEvents.keystroke(splitChar, {using: 'command down'});
    }
  }
}

@TomAnthony your project looks great. Seems you've figured out the timing issues, I'm having all sorts of problems with that!

Thank you so much. Spent an hour trying to figure this out!