effect-layer-design

Designing Effect layers with clear dependency requirements involves defining services with explicit input requirements and construction errors using Effect layer types. This approach ensures predictable service wiring and prevents tangled dependency graphs in production layer stacks.

Managing resource lifecycles during Effect service construction requires using Layer.effect with scoped lifecycle patterns, including acquireRelease-style cleanup. This ensures resources are safely allocated and released during service construction without leaks.

Use merge to combine independent layers, provide to satisfy a layer's dependencies, and provideMerge to both satisfy dependencies and merge the results. Choosing the right composition operator builds production and test layer stacks cleanly.

Structuring test compositions for Effect context services involves applying appropriate composition operators like merge and provide to build test layer stacks. This cleanly satisfies dependencies and isolates services under test from production wiring.

Effect layer wiring becomes error-prone and brittle when dependencies, resource lifecycles, and composition semantics are handled inconsistently. Using correct Context.Service patterns and consistent composition operators prevents tangled wiring and brittle services.