Effect-TS Has a Free TypeScript Standard Library — Production-Grade Error Handling and Concurrency

A TypeScript developer tried to handle errors properly. Try/catch everywhere, forgotten error cases, no way to know what a function can throw from its type signature.

Effect is a TypeScript library that makes errors, async, and concurrency type-safe. Think of it as a production-grade standard library for TypeScript.

What Effect Offers for Free

• Typed Errors - Errors in the type signature, not hidden in throws
• Concurrency - Structured concurrency with fibers
• Dependency Injection - Built-in DI without frameworks
• Retries - Configurable retry policies
• Scheduling - Cron, intervals, delays
• Streaming - Backpressured streaming
• Tracing - OpenTelemetry integration
• Schema - Runtime validation with type inference (like Zod but more powerful)

Quick Start

import { Effect, pipe } from 'effect'

const fetchUser = (id: string) =>
  Effect.tryPromise({
    try: () => fetch(\`/api/users/\${id}\`).then(r => r.json()),
    catch: () => new Error('NetworkError'),
  })

const program = pipe(
  fetchUser('1'),
  Effect.retry({ times: 3 }),
  Effect.timeout('5 seconds'),
)

Effect.runPromise(program)

GitHub: Effect-TS/effect - 8K+ stars

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