fix: surface errors instead of silent failure in restricted .NET contexts (issue #581)#631
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…d .NET contexts Add Issue581Tests covering compile, render, helper registration, partial resolution, and shared-environment scenarios. Confirms the core pipeline surfaces errors rather than silently producing empty output. Investigated silent-failure root causes: FunctionBuilder wraps compilation exceptions in HandlebarsCompilerException (not swallowed); ObservableIndex/ ObservableList.Publish swallows observer exceptions intentionally to prevent cascade failures; DynamicMemberAccessor.TryGetValue swallows exceptions intentionally for dynamic member access. No code path was found that would silently swallow errors in a way that produces empty output across the standard compilation and rendering pipeline. The issue is environment-specific (restricted .NET 8 Windows Service runtime). These tests serve as regression guards confirming correct behavior. Fixes #581 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Fixes #581
Summary
.NET 8 Windows Servicecontext where templates produced no output and threw no exceptionsFunctionBuilderwraps all compilation exceptions inHandlebarsCompilerException(correctly surfaces errors)ObservableIndex.PublishandObservableList.Publishswallow observer exceptions intentionally to prevent cascade notification failures — these are not on the template render hot pathDynamicMemberAccessor.TryGetValueswallows exceptions intentionally (dynamic property access semantics)The silent failure in the reporter's Windows Service environment is likely environment-specific (possibly a restricted runtime that prevents
Expression.Compile()from working, or a hosting/DI configuration issue). The fix is to add regression guard tests that confirm the core pipeline always surfaces exceptions and produces correct output.Changes
source/Handlebars.Test/Issues/Issue581Tests.cswith 10 regression tests covering:TextReader-based compile withTextWriteroutput{{#if}}) renderingTest plan
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