worker-thread workflow engine: executes model-written orchestration scripts off the host event loop, bridging agent() calls back to ctx.subagents

Simple reusable React error boundary component

Sandbox-enforcing implementation of the DeepSeek Harness filesystem seam: fences write/edit by the per-call sandbox mode (read-only denies mutation, workspace-write contains it to the workspace + temp roots) while reads pass through

Provides perimeter-specific URL resolution and helps identify which environment a product is running in.

Provides boundary functions, (upper-bound and lower-bound).

Storybook for React and Vite: Develop, document, and test UI components in isolation

Storybook for React and Webpack: Develop, document, and test UI components in isolation

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A simple and reusable React-Native error boundary component

Storybook Vue 3 renderer: Develop, document, and test UI components in isolation

The InAppBrowser Plugin provides a web browser view that allows you to load any web page externally. It behaves as a standard web browser and is useful to load untrusted content without risking your application's security. It offers three different ways t

React hook for using error boundaries

Storybook Svelte renderer: Develop, document, and test UI components in isolation.

Interactive UI editor with real-time preview and drag-and-drop. Syncs canvas edits back to source code via AST transforms and renders the preview in an iframe for DOM/CSS isolation (not a security sandbox).

Invoke scoped data storage for AWS Lambda Node.js Runtime Environment

Versioned extension SDK and isolated host for StateScry.

Algorithm to calculate optimal cell boundaries between multiple boxes

Storybook HTML renderer: Develop, document, and test UI components in isolation

Sandboxed browser engine (DOM + real QuickJS) compiled to WebAssembly — parse HTML, query the DOM, and run untrusted JavaScript on-device, in the browser, with no server round-trip

HTTP server mocking and expectations library for Node.js