Server variables are available only on the server. Client variables must use
clientPrefix when provided. Validation is synchronous, empty strings are
treated as undefined by default, and client access to server-only keys throws
through the returned proxy.
Create a server/client split env object.
Server variables are available only on the server. Client variables must use
clientPrefixwhen provided. Validation is synchronous, empty strings are treated as undefined by default, and client access to server-only keys throws through the returned proxy.