When passing a variable from a render array to JavaScript how do you reach that variable in your Javascript

I add a variable in the backend to a render array like so (removed superfluous code):

$some_var = 'Hello World';
return [
  '#attached' => [
    'drupalSettings' => ['someVar' => $some_var],
  ],
  '#theme' => 'core_portal_customer_subscription_edit',
  '#data' => [
    'namespace_something' => $some_var,
  ]
];

I would then like to use that variable in my JavaScript but I can’t seem to access the drupalSettings.

I tried doing the following but that console.logs undefined.

(function($, Druapl, drupalSettings) {
  Drupal.behaviors.escrowPortalCore = {
    ...
    console.log(druaplSettings.someVar);
  }
}());

(function($, Drupal, drupalSettings) {
  Drupal.behaviors.portalCore = {
    ...
    console.log(druaplSettings.someVar); // "Hello World"
  }
}(jQuery, Drupal, drupalSettings));