Effect brings typed errors and explicit dependencies to TypeScript projects

Effect is a TypeScript framework designed to close a well-known gap in the language: functions do not declare in their type signature that they can fail. With Effect, a function's return type explicitly encodes success values, expected typed errors, and required dependencies, making failure modes visible at compile time rather than hidden in documentation. The library also provides a dependency injection model where services are declared as part of the type, so missing dependencies surface as type mismatches during program composition rather than as silent runtime bugs. Beyond error handling and DI, Effect ships a dedicated toolchain that can enforce architectural rules, turning certain anti-patterns into compiler errors. The overall goal is to make TypeScript codebases more robust and predictable by embedding design decisions directly into the type system.