TaskEither Quick Reference

TaskEither = async operation that can fail. Like Promise<Either<E, A>>.

When to Use

• You need a quick fp-ts reference for async operations that can fail.
• The task involves API calls, Promise wrapping, or composing asynchronous error-handling pipelines.
• You want a concise cheat sheet for TaskEither operators and patterns.

Create

import * as TE from 'fp-ts/TaskEither'

TE.right(value)          // Async success
TE.left(error)           // Async failure
TE.tryCatch(asyncFn, toError)  // Promise → TaskEither
TE.fromEither(either)    // Either → TaskEither