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Core
5d 1h ago
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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.

.agents/skills/fp-types-ref TypeScript
TY
MA
2+ layers Tracked stack
Capabilities
0
Signals
0
Related
3
0
Capabilities
Actionable behaviors documented in the skill body.
0
Phases
Operational steps available for guided execution.
0
References
Support files available for deeper usage and onboarding.
0
Scripts
Runnable or reusable automation artifacts discovered locally.

Architectural Overview

Skill Reading

"This module is grounded in ai engineering patterns and exposes 1 core capabilities across 1 execution phases."

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

// 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

// Option
pipe(maybe, O.match(
  () => 'nothing',
  (val) => `got ${val}`
))

// Either
pipe(result, E.match(
  (err) => `error: ${err}`,
  (val) => `success: ${val}`
))

Primary Stack

TypeScript

Tooling Surface

Guide only

Workspace Path

.agents/skills/fp-types-ref

Operational Ecosystem

The complete hardware and software toolchain required.

This skill is mostly documentation-driven and does not expose extra scripts, references, examples, or templates.

Module Topology

Skill File
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Antigravity Core

Antigravity Core

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A high-performance agentic architecture developed by Deepmind for autonomous coding tasks.
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3
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