difference between olcs and ol-cesium about ol-cesium HOT 2 OPEN

The olcs package was introduced when we switched to ES6 modules.
Nowadays people should use the olcs package.

I am keeping this issue open so that we do some cleanup around these packages.

from ol-cesium.

Well, here is the full story:

• ol-cesium
  This npm package contains 1 file in UMD format (in dist) and the src (in src).
  UMD is obsolete stuff, you certainly don't want that and I think we should remove it in the future.
  You can also directly reference the sources like this: import OLCesium from 'ol-cesium/src/olcs/OLCesium.js';.
  That works and it is what I am currently using in projects actually.

• olcs
  This npm package only contains the source code, put directly at the root (not in a src directory).
  I think we did that package so that it looks nicer when you use it: import OLCesium from 'olcs/OLCesium.js';.
  If I remember correctly, OpenLayers was doing something similar with their "ol" npm package.
  I have not tested but I suppose this still works (and is the recommended way in the Readme).
  Note that import OLCesium from 'olcs'; will not work, which, I suppose, is what you tried in #1062.
  It has never worked but I completly agree that it should.

from ol-cesium.