stackblitz-pack

Diagnose WebContainer startup, isolation, Service Worker, dependency, process, preview, and browser failures from evidence before changing code or headers. Use when a StackBlitz runtime or embed fails, hangs, or behaves differently across browsers. Trigger with "StackBlitz error", "WebContainer failed to boot", or "SharedArrayBuffer error".

Architect a custom in-browser development experience around WebContainers with explicit file, editor, terminal, process, preview, and persistence boundaries. Use when evolving a playground into a maintainable IDE-like product. Trigger with "build a WebContainer IDE", "browser code editor architecture", or "StackBlitz playground design".

Design and implement a StackBlitz JavaScript SDK embed with an explicit project source, load strategy, UI options, persistence expectations, and responsive fallback. Use when documentation, training, or product pages need an interactive code example without owning a custom WebContainer runtime. Trigger with "embed StackBlitz", "StackBlitz SDK project", or "interactive code example".

Produce a privacy-safe WebContainer diagnostic bundle with browser capability, isolation-header, lifecycle, event, process-exit, dependency, and resource evidence. Use when an incident needs a shareable artifact rather than ad hoc console screenshots. Trigger with "StackBlitz debug bundle", "collect WebContainer diagnostics", or "WebContainer incident evidence".

Build a minimal, controlled WebContainer smoke test that boots once, mounts a small project, observes process exit, and captures the preview URL. Use when proving browser/runtime compatibility before building a larger in-browser development experience. Trigger with "StackBlitz hello world", "test WebContainers", or "run Node in the browser".

Prepare a StackBlitz WebContainer or JavaScript SDK integration with pinned packages, compatible isolation headers, and the correct commercial or private-package authentication path. Use when adding StackBlitz to an existing web application or reviewing its startup contract. Trigger with "install StackBlitz", "set up WebContainers", or "configure WebContainer auth".

Establish a reproducible local development and browser-test loop for a WebContainer host, including isolation-header assertions, single-boot behavior under HMR, and cleanup checks. Use when a StackBlitz integration works manually but lacks dependable regression coverage. Trigger with "test WebContainers locally", "StackBlitz dev loop", or "WebContainer Playwright test".

Establish evidence-based WebContainer capacity budgets for boot concurrency, mounted files, dependency installs, processes, previews, memory symptoms, and browser support. Use when a StackBlitz experience is slow, unstable, or being prepared for wider rollout. Trigger with "WebContainer limits", "StackBlitz capacity", or "WebContainer performance budget".

Design a durable WebContainer lifecycle adapter for filesystem, process, event, preview, and teardown operations. Use when multiple UI components need WebContainer access or an integration has race-prone boot and cleanup logic. Trigger with "WebContainer SDK patterns", "manage WebContainer lifecycle", or "StackBlitz runtime adapter".

Threat-model a WebContainer or StackBlitz embed across host, runtime, user-code, filesystem, dependency, network, preview, secret, and persistence boundaries. Use when preparing to execute untrusted code, enable private packages, or ship an interactive browser IDE. Trigger with "StackBlitz security review", "secure WebContainers", or "WebContainer threat model".