Use the Type field to determine which variant is active, then access the corresponding field:
switch customToolCallOutputItemOutputUnion2.Type { case components.CustomToolCallOutputItemOutputUnion2TypeStr: // customToolCallOutputItemOutputUnion2.Str is populated case components.CustomToolCallOutputItemOutputUnion2TypeArrayOfCustomToolCallOutputItemOutputUnion1: // customToolCallOutputItemOutputUnion2.ArrayOfCustomToolCallOutputItemOutputUnion1 is populated}
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