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UMB.FYI
2025-10-15

🚨 [Breaking change]: Removal of `BackOfficeDevelopment` runtime mode and `InModelsBuilder` models builder mode due to deprecation of Razor runtime compilation support in .NET

Andy Butland announces that Razor run-time compilation is now obsolete, urging against its use in production. This change affects Umbraco features like the BackOfficeDevelopment runtime mode and InMemoryAuto models builder, which will be removed in Umbraco 19. Users are advised to edit templates as .cshtml views and utilize dotnet watch for hot reload.

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