Ergonomic, extensible and lightweight validators.

runtime type checking and validation of untyped JSON data

Mock localStorage for headless unit tests

A flexible and `--fix`able rule for checking, inserting, and formatting file headers.

Parse and evaluate simple math expressions

An eslint plugin for inline codegen. Auto-fixes out of sync code, with presets for barrels, jsdoc to markdown and more.

A lightweight alternative to NPM packages for organizing source files within a single project

The **[Groq provider](https://ai-sdk.dev/providers/ai-sdk-providers/groq)** for the [AI SDK](https://ai-sdk.dev/docs) contains language model support for the Groq chat and completion APIs, transcription support, and browser search tool.

Ember AST transform for the in-element helper

The **Model Context Protocol (MCP) client** for the [AI SDK](https://ai-sdk.dev/docs) lets you connect to MCP servers and use their tools with AI SDK functions like `generateText` and `streamText`.

This [remark][remark] plugin can disable any or all remark `blockTokenizers` and `inlineTokenizers`. It can not only disable the ones provided by remark core, but also any other tokenizer that has been added to the remark parser whether through plugins or

tRPC API for Mock Service Worker (MSW).

Execute Gherkin scenarios in Jest

Build JSON object for Slack Block Kit surfaces from JSX

The **[Google Vertex provider](https://ai-sdk.dev/providers/ai-sdk-providers/google-vertex)** for the [AI SDK](https://ai-sdk.dev/docs) contains language model support for the [Google Vertex AI](https://cloud.google.com/vertex-ai) APIs.

Type safe dependency injection framework for TypeScript

Data querying library for testing JavaScript applications.

Deterministic pseudo-random number generator for JavaScript and TypeScript

A toolkit of Nullable/Option/Result type implementation in ECMAScript. Their APIs are inspired by Rust's `Option<T>` and `Result<T, E>`.

An elegant way to define lightweight protocols on-top of TCP/TLS sockets in node.js