What is Smoke Check (npm run check / build)?
The cheapest reliable gate: typecheck plus production build. Run it after every structural change — it catches breakage code review would take ten times longer to find.
Related terms
Visual Testing Agent
A preview-URL auditor that checks rendered pages like a visitor would. Read-only by default; writes structured findings the builder can act on.
Pass-1 Build
The uninterruptible first generation surface: styles, layout, page, components, then validation. Letting pass one finish prevents half-built states that later edits have to repair.
Deployment Analytics
Per-window requests, errors, CPU time, and subrequests for every deployment, plus custom-domain status. Analytics turn “is it down?” from a feeling into a chart.
Svelte Runes
The `$state`, `$derived`, `$effect`, and `$props` primitives powering Svelte 5 reactivity. Runes are mandatory in generated code: explicit, compilable, and consistent across every component.
File-Based Routing
Pages defined by file location: `+page.svelte` renders, `+layout.svelte` wraps, `+server.js` serves data. The route tree is the app map — no separate router config to drift.
Load Function
Server-side data loading for a route before it renders. Load on the server for content crawlers and users need immediately; reach for client fetching only for interactive extras.