Makes the left sidebar expand on mouse over. THIS CODE IS OUT OF DATE! For latest go to https://github.com/oschmid/roam-plugins

roam-left-sidebar-expander.js

var leftExpander = document.querySelector('#left-expander');
if (leftExpander != null) {
  leftExpander.parentNode.removeChild(leftExpander);
}
function getEventHandlers(element) {
  for (var prop in element) {
    if (prop.includes('reactEventHandlers')) {
      return element[prop];
    }
  }
}
leftExpander = document.createElement('span');
leftExpander.id = 'left-expander';
leftExpander.style.height = '100%';
leftExpander.style.width = '1em';
leftExpander.style.position = 'absolute';
leftExpander.addEventListener('mouseenter', function(e) {
  const leftMenu = document.querySelector('.bp3-icon-menu');
  if (!leftMenu) { return; }
  getEventHandlers(leftMenu).onMouseEnter();
});
document.querySelector('.roam-body-main').prepend(leftExpander);