skills.rest
whatiskadudoing
whatiskadudoingCOMMUNITY
Explore all skills by this author →
WebsiteGitHub

Practical Error Handling with fp-ts

Transform fp-ts Either and TaskEither runtime failures into explicit, chainable error-handling values for TypeScript projects.

11|3|Updated Jan 30, 2026
Search Tags:#error handling#TypeScript#validation#functional programming#fp-ts#TaskEither#Either
One-click install
npx skills add https://github.com/whatiskadudoing/fp-ts-skills --skill practical-error-handling-with-fp-ts
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: Practical Error Handling with fp-ts
Source: https://github.com/whatiskadudoing/fp-ts-skills/tree/main/skills/fp-errors
Command: npx skills add https://github.com/whatiskadudoing/fp-ts-skills --skill practical-error-handling-with-fp-ts

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

This Skill helps developers stop throwing exceptions and instead represent failures as explicit data using fp-ts's Either and TaskEither, enabling more predictable and testable code.

Core Features & Use Cases

  • Return errors as values with Either and TaskEither to model failures in synchronous and asynchronous steps.
  • Chain multiple operations safely with E.chain / E.chainW and TE.chain, enabling clean, composable error handling.
  • Validate inputs and optionally accumulate multiple errors using an applicative style for forms and complex validations.

Quick Start

Install and activate this skill, then invoke its examples or apply it directly in your TypeScript projects. The Quick Start below demonstrates enabling the skill from the repository.

Frequently Asked Questions about Practical Error Handling with fp-ts

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I handle errors as values in TypeScript instead of throwing exceptions?▼

Chain multiple asynchronous operations safely in TypeScript by using fp-ts TE.chain and E.chainW to compose TaskEither workflows, propagating errors as values through each step without nested try-catch blocks.

What is the best way to accumulate multiple validation errors in TypeScript?▼

Accumulate multiple validation errors in TypeScript by applying an fp-ts applicative style with Either, collecting all failures for forms and complex inputs instead of stopping at the first encountered error.

How do I wrap throwing code at API boundaries in TypeScript?▼

Wrap throwing code at API boundaries in TypeScript by adopting fp-ts TaskEither to capture runtime failures from external calls, transforming thrown exceptions into explicit Either values for reliable error handling.

Can I use fp-ts TaskEither for asynchronous data validation and API calls?▼

Use fp-ts TaskEither for asynchronous data validation and API calls in TypeScript to represent runtime failures as explicit values, enabling reliable error handling across asynchronous workflows without try-catch.

When should I not use fp-ts Either for error handling in TypeScript?▼

Avoid using fp-ts Either for error handling in TypeScript when your project cannot adopt functional programming patterns or when simple try-catch blocks suffice, as Either requires wrapping throwing code and composing with chain.

Related Skills

Explore More Software Engineering Skills→
whatiskadudoingwhatiskadudoing
11

fp-refactor

Migrates imperative TypeScript codebases to fp-ts patterns like Either, TaskEither, and Reader.

Community
Advanced
managedcodemanagedcode
466

dotnet-managedcode-communication

Implement explicit result objects and structured errors in .NET service boundaries.

Official
Intermediate
whatiskadudoingwhatiskadudoing
11

fp-ts Option and Either

Convert nullables to Option and propagate typed errors with fp-ts Either.

Community
Intermediate
manutejmanutej
1

typescript-fp

Enforce strict typing and functional patterns in TypeScript with fp-ts.

Community
Advanced