I am seeing this same issue with an ionic 4 build. The problem is Angular 5 relies on the crypto library from node (and a couple other child dependencies). The solution @ymphyow linked to above in Stack Overflow resolves the crypto error, but then you have an error with Stream missing from the browser. The correct solution is auth0 needs to update their cordova package to depend on browser based crypto functions, or include the necessary node modules as dependencies in the package.
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