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dart-migrate-to-checks-package

Replace the usage of `expect` and similar functions from `package:matcher` to `package:checks` equivalents.

skills/dart-migrate-to-checks-package/SKILL.md

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# Migrating Dart Tests to Package Checks

Use this skill when you need to migrate a Dart test suite from the legacy
`package:matcher` (which is exported by default from `package:test/test.dart`)
to the modern, type-safe, and literate `package:checks` assertion library.

## Contents
- [When to Use This Skill](#when-to-use-this-skill)
- [How to Use This Skill (The Workflow)](#how-to-use-this-skill-the-workflow)
- [Key Syntax Differences and Pitfalls](#key-syntax-differences-and-pitfalls)
- [Matcher-to-Checks Mapping Table](#matcher-to-checks-mapping-table)
- [Matchers with No Direct Replacements](#matchers-with-no-direct-replacements)
- [Strategies for Discovery](#strategies-for-discovery)
- [Examples](#examples)