Effect Has a Free TypeScript Standard Library — Here's How to Use It

TypeScript has no standard library for errors, retries, concurrency, or scheduling. Effect fills that gap — typed errors, resource management, dependency injection, and more. What Is Effect? Effect is a comprehensive TypeScript library that provides tools for managing errors, async operations, concurrency, and application architecture. Think of it as "what TypeScript's standard library should be." Quick Start npm install effect import { Effect , Console } from ' effect ' ; const program = Effect . gen ( function * () { yield * Console . log ( ' Hello from Effect! ' ); const result = yield * Effect . succeed ( 42 ); yield * Console . log ( `Result: ${ result } ` ); return result ; }); Effect . runPromise ( program ); Typed Errors (The Killer Feature) class UserNotFoundError { readonly _tag = ' UserNotFoundError ' ; constructor ( readonly userId : string ) {} } class DatabaseError { readonly _tag = ' DatabaseError ' ; constructor ( readonly message : string ) {} } // TypeScript KNOWS whi