I tried to contact Matt as npm package author but maybe someone else can also help.
I am using Cesium with jspm. So far with some quirks it was working fine. However with Cesium 1.33, jspm started complain about ThirdParty/pako_inflate on GoogleEnterpriseServerMetadata module. In order to debug the problem I built cesium from git repo, and after replacing the build with jspm package, I realized if I configure format as "global" it is working without pako_inflate error. (with npm package before 1.33, I did not need to state format of the package, cjs format of package was ok).
So it seems like my problem is caused by npm package's build. I compared the version in npm package, and the one I built, and npm version do not look identical.
The way I build from git is using "gulp release". I hope there is a similar gulp task for npm.
Does anyone know where I can see the build configuration for npm package? There seems like one define is missing some place for npm package build to work with jspm, but as I can not reproduce similar build I can not debug it.