TypeScript Mutually Exclusive Unions: From `?: never` to `ExclusifyUnion`

DEV CommunityThursday, November 6, 2025 at 10:02:35 PM

TypeScript Mutually Exclusive Unions: From `?: never` to `ExclusifyUnion`

The article discusses the concept of mutually exclusive unions in TypeScript, highlighting the advantages of using the ExclusifyUnion pattern. This approach allows developers to model data more effectively by ensuring that only one shape can be accessed at a time, eliminating the need for constant defensive checks. This is particularly important for improving code readability and maintainability, making it a valuable technique for TypeScript users.
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