fp-types-ref
Quick reference for fp-ts types. Use when user asks which type to use, needs Option/Either/Task decision help, or wants fp-ts imports.
Best use case
fp-types-ref is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Quick reference for fp-ts types. Use when user asks which type to use, needs Option/Either/Task decision help, or wants fp-ts imports.
Teams using fp-types-ref should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/fp-types-ref/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How fp-types-ref Compares
| Feature / Agent | fp-types-ref | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Quick reference for fp-ts types. Use when user asks which type to use, needs Option/Either/Task decision help, or wants fp-ts imports.
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
SKILL.md Source
# fp-ts Quick Reference
## Which Type Should I Use?
```
Is the operation async?
├─ NO: Does it involve errors?
│ ├─ YES → Either<Error, Value>
│ └─ NO: Might value be missing?
│ ├─ YES → Option<Value>
│ └─ NO → Just use the value
└─ YES: Does it involve errors?
├─ YES → TaskEither<Error, Value>
└─ NO: Might value be missing?
├─ YES → TaskOption<Value>
└─ NO → Task<Value>
```
## Common Imports
```typescript
// Core
import { pipe, flow } from 'fp-ts/function'
// Types
import * as O from 'fp-ts/Option' // Maybe exists
import * as E from 'fp-ts/Either' // Success or failure
import * as TE from 'fp-ts/TaskEither' // Async + failure
import * as T from 'fp-ts/Task' // Async (no failure)
import * as A from 'fp-ts/Array' // Array utilities
```
## One-Line Patterns
| Need | Code |
|------|------|
| Wrap nullable | `O.fromNullable(value)` |
| Default value | `O.getOrElse(() => default)` |
| Transform if exists | `O.map(fn)` |
| Chain optionals | `O.flatMap(fn)` |
| Wrap try/catch | `E.tryCatch(() => risky(), toError)` |
| Wrap async | `TE.tryCatch(() => fetch(url), toError)` |
| Run pipe | `pipe(value, fn1, fn2, fn3)` |
## Pattern Match
```typescript
// Option
pipe(maybe, O.match(
() => 'nothing',
(val) => `got ${val}`
))
// Either
pipe(result, E.match(
(err) => `error: ${err}`,
(val) => `success: ${val}`
))
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