fast-check Documentation llms.txt · AI Docs Browser · mdream [llms.txt Tools](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt) # fast-check Documentation llms.txt Browse fast-check Documentation documentation as markdown. Click any page in the sidebar to view it, or copy the full llms.txt for your AI tools. fast-check.dev/llms.txt [Raw llms.txt](https://fast-check.dev/llms.txt) [Raw llms-full.txt](https://fast-check.dev/llms-full.txt) Copy Markdown [](https://fast-check.dev/llms.txt) llms.txt Table of Contents Fake data Fuzzing Advanced Model based testing Race conditions AI-Powered Testing 🧙 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a91404 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a9140 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/packag https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a91404 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a9 Arbitrary Arbitrary Function: assert() Function: asyncDefaultReportMessage() Function: asyncModelRun() IAsyncPropertyWithHooks Function: asyncStringify() Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary RunDetails CloneValue Function: cloneIfNeeded() Arbitrary Arbitrary Arbitrary Function: configureGlobal() Arbitrary Arbitrary ContextValue DepthIdentifier Arbitrary Function: defaultReportMessage() Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary FalsyValue Arbitrary Arbitrary Arbitrary Arbitrary GeneratorValue DepthContext Function: hasAsyncToStringMethod() Function: hasCloneMethod() Function: hasToStringMethod() Function: hash() Stream Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary JsonValue LetrecValue Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Memo Arbitrary Function: modelRun() Arbitrary Arbitrary Arbitrary Arbitrary OneOfValue Arbitrary Function: pre() IPropertyWithHooks GlobalParameters Arbitrary Function: resetConfigureGlobal() Function: sample() Function: scheduledModelRun() Scheduler Scheduler Arbitrary Arbitrary Arbitrary Function: statistics() Stream Arbitrary Arbitrary Function: stringify() Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary Arbitrary API Reference https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pack https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pac https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef58 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pa https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/packa https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pac https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pac https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f7 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pack https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pack https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a91404 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a91404 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef5 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef58 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pa https://github.com/dubzzz/fast-check/blob/740a1476 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pac https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pack https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/packag https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/ https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/packag https://github.com/dubzzz/fast-check/blob/740a https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pac https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a9140 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e47 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/ https://github.com/dubzzz/fast-check/blob/740a14765c10f16e0 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pa https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/packa https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f7 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f7 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pa https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef5 https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pac https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/pack https://github.com/dubzzz/fast-check/blob/740a14765c10f16e00a914047e471ef582a2f71a/packag Type Alias: AsyncPropertyHookFunction Type Alias: BigIntArrayConstraints Type Alias: CloneValue Type Alias: DepthContext DepthContext Size Type Alias: EntityGraphArbitraries Type Alias: EntityGraphConstraints EntityGraphConstraints Type Alias: EntityGraphRelations Type Alias: EntityGraphValue Type Alias: FalsyValue FloatConstraints DoubleConstraints Type Alias: GeneratorValue Type Alias: GlobalAsyncPropertyHookFunction Parameters Type Alias: GlobalPropertyHookFunction Type Alias: IntArrayConstraints Type Alias: JsonValue LetrecValue Arbitrary LetrecValue Type Alias: LetrecValue WeightedArbitrary Arbitrary Type Alias: ModelRunAsyncSetup Type Alias: ModelRunSetup Type Alias: OneOfConstraints Type Alias: OneOfValue Type Alias: PropertyFailure Type Alias: PropertyHookFunction Type Alias: RandomGenerator Type Alias: RandomType Type Alias: RecordConstraints Type Alias: RecordValue RunDetailsFailureProperty Type Alias: SchedulerAct Type Alias: SchedulerSequenceItem Type Alias: SetConstraints Type Alias: Size Size StringSharedConstraints Type Alias: StringMatchingConstraints UniqueArrayConstraintsRecommended UniqueArraySharedConstraints UniqueArraySharedConstraints UniqueArraySharedConstraints Type Alias: UniqueArraySharedConstraints Type Alias: WithAsyncToStringMethod Type Alias: WithToStringMethod Variable: asyncToStringMethod Variable: cloneMethod Variable: __commitHash Variable: toStringMethod Variable: __type Variable: __version Custom reports Global settings Configuration Larger entries by default Timeouts User definable values Any Constant Combiners Recursive Structure String Array Function Composites Iterable Object Typed Array File Identifier Fake Data Internet Arbitraries Others BigInt Boolean Date Primitives Number String Core Blocks Properties Runners 🌱 Ecosystem Getting Started Introduction Track Record What is Property-Based Testing? Why Property-Based Testing? From 3.x to 4.x Support us Detect race conditions Multiple batches of calls One step closer to real usages The missing part Wrapping up Your first race condition test Tutorials Basic Setup Quick Start Our first Property-Based Test Read test reports Setting up your Test Environment Property Based Testing — Manual setup Property Based Testing with Bun test runner Property Based Testing with Deno test runner Property Based Testing with Jest Property Based Testing with Node.js test runner Property Based Testing with Vitest fast-check ❤️ docusaurus What's new in fast-check 3.9.0? What's new in fast-check 3.10.0? What's new in fast-check 3.11.0? What's new in fast-check 3.12.0? Dual packages or supporting both CJS and ESM What's new in fast-check 3.13.0? Detect prototype pollution automatically Zod What's new in fast-check 3.14.0? What's new in fast-check 3.15.0? What's new in fast-check 3.16.0? What's new in fast-check 3.17.0? What's new in fast-check 3.18.0? What's new in fast-check 3.19.0? What's new in fast-check 3.20.0? Faker What's new in fast-check 3.21.0? What's new in fast-check 3.22.0? What's new in fast-check 3.23.0? Advent of PBT 2024 · Day 1 Advent of PBT 2024 · Day 2 Advent of PBT 2024 · Day 3 Advent of PBT 2024 · Day 4 Advent of PBT 2024 · Day 5 Advent of PBT 2024 · Day 6 Advent of PBT 2024 · Day 7 Advent of PBT 2024 · Day 8 Advent of PBT 2024 · Day 9 Advent of PBT 2024 · Day 10 Advent of PBT 2024 · Day 11 Advent of PBT 2024 · Day 12 Advent of PBT 2024 · Day 13 Advent of PBT 2024 · Day 14 Advent of PBT 2024 · Day 15 Advent of PBT 2024 · Day 16 Advent of PBT 2024 · Day 17 Advent of PBT 2024 · Day 18 Advent of PBT 2024 · Day 19 Advent of PBT 2024 · Day 20 Advent of PBT 2024 · Day 21 Advent of PBT 2024 · Day 22 Advent of PBT 2024 · Day 23 Advent of PBT 2024 · Day 24 What's new in fast-check 4.0.0? Beyond flaky tests — Bringing Controlled Randomness to Vitest What's new in fast-check 4.1.0? What's new in fast-check 4.2.0? What's new in fast-check 4.3.0? What's new in fast-check 4.4.0? What's new in fast-check 4.5.0? What's new in fast-check 4.6.0? What's new in fast-check 4.7.0? What's new in fast-check 4.8.0? ## What is fast-check Documentation's llms.txt? fast-check Documentation publishes an `/llms.txt` file that provides AI systems with a structured index of its documentation. It follows the [llms.txt specification](https://llmstxt.org), organizing links to guides, API references, and tutorials under section headings so that LLMs like ChatGPT, Claude, and Gemini can quickly understand what fast-check Documentation offers and where to find details. Pass Spec 1 Sections 334 Links 66.5 KB Size ~17.0k Tokens Sections: Table of Contents ## Add fast-check Documentation Docs to Your AI Assistant Select your tool to see how to add fast-check Documentation's llms.txt as a documentation source. Cursor Windsurf Claude Code ChatGPT Zed Copilot 1. 1 Open any chat or composer panel 2. 2 Type @Docs and select "Add new doc" 3. 3 Paste the URL: https://fast-check.dev/llms.txt 4. 4 Wait for the green dot (indexing complete) 5. 5 Reference @Docs in chat when asking about fast-check Documentation Cursor crawls the URL and indexes all subpages. Add a trailing slash to index child pages too. ## Spec Compliance 103 notes ## Frequently Asked Questions Where is fast-check Documentation's llms.txt file? fast-check Documentation publishes its llms.txt at https://fast-check.dev/llms.txt. This file provides a structured, markdown-formatted index of fast-check Documentation's documentation that AI systems can consume to understand the project's APIs, guides, and references. How do I use fast-check Documentation's llms.txt with AI coding assistants? Copy the llms.txt content and paste it into your AI assistant (Cursor, Windsurf, Claude, ChatGPT) as context. This gives the AI an accurate map of fast-check Documentation's documentation so it can provide better code suggestions and answers about fast-check Documentation. What does fast-check Documentation's llms.txt contain? fast-check Documentation's llms.txt contains 1 sections and 334 documentation links in 66.5 KB (~17.0k tokens). Key sections include Table of Contents. How many tokens does fast-check Documentation's llms.txt use? The concise llms.txt index is approximately 17.0k tokens (66.5 KB). Most AI assistants can fit this within their context window. For the full expanded documentation, look for an llms-full.txt variant which embeds all content inline. What is fast-check Documentation? Complete documentation for fast-check - Property-based testing framework for JavaScript/TypeScript. fast-check Documentation's llms.txt file helps AI systems understand this by providing a structured overview of its documentation, making it easier for developers to get accurate AI-assisted help when working with fast-check Documentation. Can I generate an llms.txt for my own project? Yes. Use the free llms.txt generator at mdream.dev/tools/llms-txt/generator to crawl your site and produce a spec-compliant llms.txt file. You can also validate existing files with the llms.txt validator. ## Browse More llms.txt Files [Javalin Javalin is a lightweight web framework for Java and Kotlin. Version 7 (current) requires Java 17+ and runs on Jetty 12. All configuration - routes, handlers, plugins, lifecycle events - is passed upfront in a single config block when creating the instance.](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/javalin) [React Native · Learn once, write anywhere A framework for building native apps for Android, iOS, and more using React](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/react-native-learn-once-write-anywhere) [What is Datadog?](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/datadoghq) [Vendure Documentation Vendure is a headless commerce framework built on Node.js with TypeScript.](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/vendure-documentation) [Snowflake Documentation Snowflake is a cloud data platform providing data warehousing,](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/snowflake) [Medusa Digital commerce platform with a built-in framework](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/medusa) [Firebase App development platform by Google](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/firebase) [Upstash Serverless data platform for Redis and Kafka](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt/upstash) [View all 99 projects ](https://mdream.dev/llms-txt/fast-check-documentation/llms-txt) ## Related Tools [

llms.txt Generator

Generate an llms.txt for your own project.](https://mdream.dev/llms-txt/fast-check-documentation/tools/llms-txt/generator) [

llms.txt Validator

Validate your llms.txt against the official spec.](https://mdream.dev/llms-txt/fast-check-documentation/tools/llms-txt/validator) © 2026 [Harlan Wilton](https://github.com/harlan-zw) · [MIT](https://github.com/harlan-zw/mdream/blob/main/license) [GitHub](https://github.com/harlan-zw/mdream) [Discord](https://discord.com/invite/275MBUBvgP)