Property testing for JavaScript

Quick and dirty CSS property testing

Oxlint rules enforcing the property-testing contract: it.prop / it.effect.prop predicates return a boolean on every path, never assert/expect, and never run through raw fc.assert.

Property testing for JavaScript

TEA-faithful state machine substrate — one package, every host adapter. Core + subs + testing, plus React, Durable Object, Chrome extension, Node, in-memory, work-queue, devtools, and property-testing modules as subpaths.

Complete oxlint preset for Effect and cell architecture: bundles all custom rule plugins (workflow, schema, entrypoint, property testing, test placement, hygiene) with type-aware correctness settings in a single config.

Property testing for JavaScript

MeTTa-native property testing, shrinking, state-machine testing, and bounded verification for MeTTaScript.

One-shot oxlint plugin bundle: registers the surviving architecture rules in the DMMF family (property testing, test hygiene, test placement, effect-schema, effect-workflow) under a single entrypoint, excluding the core junk drawer.

Property testing for JavaScript

Property testing for JavaScript

Property testing for JavaScript

Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.

`Object.defineProperty`, but not IE 8's broken one.

Define a data property on an object. Will fall back to assignment in an engine without descriptors.

Dead simple chaos/property testing

Match a Unicode property or property alias to its canonical property name per the algorithm used for RegExp Unicode property escapes in ECMAScript.

Property testing for Tap using fast-check

Property based testing for Vitest based on fast-check

Match a Unicode property or property alias to its canonical property name per the algorithm used for RegExp Unicode property escapes in ECMAScript.