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Use fp-refactor to refactor [target TypeScript module] toward appropriate fp-ts patterns for its error handling, nullable values, async flows, or dependencies; preserve its external behavior, add or update focused tests, and report the migration tradeoffs and any code that should remain imperative. Success criteria: [acceptance criteria].
Required inputs
[target TypeScript module]
[acceptance criteria]
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This skill provides comprehensive patterns and strategies for migrating existing imperative TypeScript code to fp-ts functional programming patterns.
Detailed Guide
Read the detailed guide before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.
When to Use
You are refactoring an existing imperative TypeScript codebase toward fp-ts patterns.
The task involves converting try/catch, null checks, callbacks, DI, or loops into functional equivalents.
You need migration guidance and tradeoffs, not just isolated fp-ts examples.
Limitations
Use this skill only when the task clearly matches the scope described above.
Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.