effect-oxlint

Effect-first library for writing oxlint custom lint rules. Current stable version: 0.2.0. Release cadence: irregular, with initial releases in early 2025. Key differentiators: provides typed errors, composable visitors, Option-safe AST matching, and Ref-based state without mutable variables, wrapping @oxlint/plugins in Effect idioms. Requires effect@^4.0.0-beta.57 as a peer dependency. Ideal for Effect ecosystem developers who want to write lint rules with Effect's effectful computation model.