nodatime

C#/.NET conventions for this user's projects — multi-targeting for libraries, NUnit/xUnit testing, warnings-as-errors, immutability, exception-based error handling, and dependency injection used selectively. Use when writing or reviewing C# code, .csproj/Directory.Packages.props files, or test suites in a .NET project.

GitHub workflow conventions: writing clear conventional commits, opening detailed issues and PRs via the `gh` CLI, and choosing trunk-based vs short-lived branch flow based on the size of the change. Use whenever the user wants to commit, branch, push, open an issue, open a PR, or asks how to structure any of those. Keep it light — direct, detailed messages, no ceremony.

Gang of Four design patterns reference for TypeScript projects. Use when choosing or implementing a design pattern, refactoring toward a known pattern, reviewing code for pattern misuse, or answering "which pattern fits here" questions. Covers all 23 creational, structural, and behavioral patterns with idiomatic TypeScript examples and guidance on when (and when not) to use each.

Unit-testing conventions specific to src/NodaTime.Test (and sibling .Test projects) in this repo — partial test classes split by concern, TestHelper contract testers for equality/comparison/operators, CultureSaver, TestCase/TestCaseSource data patterns, XML round-trip assertions. Use when writing or reviewing tests under src/NodaTime.Test, src/NodaTime.TzdbCompiler.Test, or src/NodaTime.Test.Console.