effect-incremental-migration

To migrate Promise-based modules to Effect without breaking callers, extract service interfaces returning Effect types, wire dependencies via Layer.effect, and provide temporary async facades using ManagedRuntime with a shared memoMap for backward compatibility.

The best way to convert Promise.all fan-out to Effect is by replacing it with Effect.forEach, which allows you to apply explicit concurrency control over the asynchronous operations while maintaining typed error channels.

To wire dependencies when building an Effect service, use Layer.effect implementations that capture real requirements via the yield* operator, then compose a defaultLayer for the standard runtime execution path.

You should prune ManagedRuntime facades once all internal Effect callers yield the service directly instead of using Effect.promise, eliminating the temporary async bridge and relying fully on typed context services.

When refactoring async functions to typed effects, update error handling by moving away from defect-catching patterns and routing failures through typed channel errors explicitly declared in your Effect service signatures.

Yes, you can incrementally migrate async modules by composing raw and default layers together, allowing your codebase to maintain raw Promise callers while progressively updating call-sites to consume Effect services directly.