Toasts (stacking, undo)

Generated from mcp/patterns.registry.json — do not edit by hand; change the registry and run bun run patterns:build.

Index card — the docs below are the canonical explanation; deep-tier pattern pages additionally carry invariants and emulation notes.

Category: App Shell & Navigation · Tier: light · Risk: low — structural pattern, no external services

Ephemeral, stacking feedback messages (success/error/warning/info) shown in response to user-initiated actions, distinct from the persistent notification center.

When to use: Reach for it when giving immediate feedback for a user action such as a save, delete, or copy, optionally with an undo affordance.

Docs

• docs/blueprint/app-shell/toast.md (GitHub · GitLab)

Code

• src/lib/components/composites/toast/ (GitHub · GitLab)
• src/lib/state/toast.svelte.ts (GitHub · GitLab)

Proof

• /showcases/shell/toasts

Machine-readable record: app-shell-toasts in mcp/patterns.registry.json.