Effect-TS Concurrency

Overview

Effect-TS provides lightweight fibers for high-performance concurrency. The core principle is explicit control: always bound parallelism to prevent resource exhaustion.

When to Use

• Processing large arrays of effects (e.g., Effect.all, Effect.forEach)
• Rate limiting external API calls or database connections
• Coordinating work between background processes (fibers)
• Signaling completion or state changes across different parts of the app

When NOT to use:

• Simple sequential operations
• When standard Promise.all is sufficient (though Effect is usually preferred for consistency)

Core Pattern: Bounded Parallelism

Unbounded parallelism is the most common source of "Too many open files" or "Connection timeout" errors.