A pnpm monorepo of Effect-TS packages — pure functional cores behind thin imperative shells, property-tested and mutation-gated. The oxlint-plugin enforces the System F Software constitution; the monorepo lints itself with it.
| Package | npm | What it does |
|---|---|---|
effect-gherkin-spec |
@systemfsoftware/effect-gherkin-spec |
feature/scenario/outline DSL for Gherkin-style behaviour tests composed as Effects, with Scenario Outline expansion and typed step errors. |
effect-daemon-spec |
@systemfsoftware/effect-daemon-spec |
A typed supervision-tree daemon for Effect — leader election, lock primitives, restart-intensity windows, dynamic children, and health latches. |
oxlint-plugin |
@systemfsoftware/oxlint-plugin |
24 oxlint rules enforcing the constitution: ban classes and string errors, forbid native timers/Promise/Date inside Effect, require pipeable composition, keep tests off the I/O boundary. |
effect-schema-law |
@systemfsoftware/effect-schema-law |
One call asserts the codec laws of any Effect Schema as Vitest property tests — decode∘encode is identity, and encoding is stable under a decode round-trip. |
stryker-plugins |
@systemfsoftware/stryker-plugins |
Stryker mutation-testing plugins for Effect — effect-schema-ignorer skips equivalent mutants on Effect Schema declarations so the score reflects behaviour, not data. |
rx-effect |
@systemfsoftware/rx-effect |
Bridge RxJS and Effect — turn an Observable into a typed Effect Stream with backpressure and proper interruption. |
effect-schema-extensions |
@systemfsoftware/effect-schema-extensions |
Extra Effect Schema codecs — branded hex-string schemas with decode/encode and arbitraries. |
Supporting internal packages (tsconfig, oxlint-config, vitest-config) are not published.
pnpm add @systemfsoftware/effect-gherkin-spec
pnpm add @systemfsoftware/effect-daemon-spec
pnpm add -D @systemfsoftware/oxlint-pluginEach package's README has a usage example and API reference.
effectis a peer dependency of every published package.effect-gherkin-specalso peers@effect/vitestandvitest.
Development setup, build, test, and lint commands: AGENTS.md.
Read the constitution and CONSTITUTION.md before contributing. The constitution is vendored from systemfsoftware/constitution as a subtree.
Licensed under Apache 2.0.