chore(deps): update dependency imposter to 0.2.0

[thomhurst]

This PR contains the following updates:

Package	Type	Update	Change
Imposter	nuget	minor	0.1.11 → 0.2.0

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Release Notes

themidnightgospel/Imposter (Imposter)

v0.2.0: Generator performance, deterministic file names, indexer and async fixes

Compare Source

Fixes

• Generic method calls no longer slow down over time (#​61, closes #​60). An unconfigured call to a generic method stored a new imposter that could never match, and every later call scanned all of them. After a few thousand calls, each call cost about 0.5 ms. A miss now returns an imposter that is not stored, and the lookup is a plain loop instead of a LINQ chain.

• Indexer keys are compared with EqualityComparer<T>.Default (#​63, closes #​62). The generated indexer arguments compared keys with ==. That caused two problems:

  • It did not compile for unconstrained generic keys or for structs without == (CS0019).
  • It used reference equality for classes that override Equals, so the default indexer behaviour could not read back a value stored under an equal key.

• Async methods are recognised on netstandard2.0 and .NET Framework (#​65, closes #​64). Task, Task<T> and ValueTask<T> were only recognised when they came from System.Runtime, System.Private.CoreLib or mscorlib. On netstandard2.0, and for ValueTask<T> on .NET Framework, the builders lacked ReturnsAsync/ThrowsAsync. Task types are now detected by name and namespace.

• Cancelled builds no longer report a generator crash (#​75, closes #​74). A build cancelled while an imposter was being generated reported IMP005. The IDE then kept a result without the imposter until the next edit. Cancellation now propagates.

• Generated file names no longer depend on attribute order (#​77, closes #​76). Two targets with the same name in different namespaces got IFooImposter.g.cs and IFooImposter_1.g.cs in processing order, so reordering the attributes swapped the files. Each file is now named after its fully qualified target, e.g. Sample.IFooImposter.g.cs, or Imposters.Sample.IFooImposter.g.cs for the dedicated namespace.

Performance

• Faster generator with lower memory use (#​67, #​69, #​71):
  • Symbol-derived syntax is cached in metadata.
  • Method metadata is no longer boxed.
  • Generated code is written in a single pass over its tokens instead of through NormalizeWhitespace.
  • For the 21 imposters in our sample set, generation went from about 1.2 s and 452 MB allocated to about 0.33 s and 168 MB.
• Smaller generated code (#​73). Members that were never used are no longer emitted, including:
  • stored imposter references in method builders;
  • an unused invocation behaviour field;
  • indexer getter invocation counters;
  • accessor members that the indexer or property does not have.

Changes to generated output

• Generated files use tab indentation and LF line endings (#​71). The layout is otherwise unchanged.
• Generated file names include the target's namespace (#​77). If you inspect the files through EmitCompilerGeneratedFiles, they now appear under the new names.

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-06T22:15:55.184375Z	7e460f0	PR opened

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• Directory.Packages.props

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📝 Walkthrough

Walkthrough

The centrally managed Imposter package version changes from 0.1.11 to 0.2.0.

Changes

Package version update

Layer / File(s)	Summary
Update the Imposter package version Directory.Packages.props	The centrally managed Imposter package version changes from 0.1.11 to 0.2.0.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~2 minutes

Change: Other

Suggested reviewers: quattordici

Merge Risk: ⚪ Minimal · up to 7e460

No concrete compatibility issue is established for this version update, so no material merge risk remains.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the change: updating the Imposter dependency to version 0.2.0.

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_{A rabbit checks the version line,
And sees the package change in time.
From eleven to two-oh,
A tidy update starts to show.
Then hops away beneath the moon.}

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[greptile-apps]

Confidence Score: 5/5

[High risk] Updates a test mocking dependency to a new minor version.

This dependency update appears safe to merge.

What we checked:

• Indexer changes do not affect benchmarks: The four interfaces registered with GenerateImposter have no indexers.

Summary

Updates Imposter from 0.1.11 to 0.2.0 in Directory.Packages.props.

• The package is used by TUnit.Mocks.Benchmarks.
• No actionable issues were found. Builds and benchmarks were not run.

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