I’m doing this as a workaround. and it works. (I don’t know if .d.ts also go in the cdn?)
I share it in case someone wants to do the same.
'when this code is executed, it creates or updates the local javascript file from the remote file
PS: It is necessary if the server is local (easyphp, wamp) to activate extention : extension=php_openssl.dll
<?php
$arrContextOptions = array("ssl" => array("verify_peer"=>false, "verify_peer_name"=>false));
$babylonFile = file_get_contents("https://preview.babylonjs.com/babylon.js", false, stream_context_create($arrContextOptions));
$localProjet = "../my_project/libs/babylon/";
file_put_contents($localProjet."babylon.js", "".$babylonFile."");
?>
Do the same with the other files gui, materials, inspector…