Use the Type field to determine which variant is active, then access the corresponding field:
switch messagesMessageParamContentUnion2.Type { case components.MessagesMessageParamContentUnion2TypeStr: // messagesMessageParamContentUnion2.Str is populated case components.MessagesMessageParamContentUnion2TypeArrayOfMessagesMessageParamContentUnion1: // messagesMessageParamContentUnion2.ArrayOfMessagesMessageParamContentUnion1 is populated}
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