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Open Source NewsSeptember 4, 20252 min read

Safer Multi-Option Inputs with @oneOf

By BIOS Founding Team

Safer Multi-Option Inputs with @oneOf

OneOf Input Objects officially landed in the GraphQL specification, giving schema authors a standard way to express 'exactly one of several possible options' as input, a long-requested feature that closes a common type-safety gap in GraphQL API design.

Full details: https://graphql.org/blog/2025-09-04-multioption-inputs-with-oneof/