Ships the surface that lets opted-in beta accounts build, save, and
activate WhatsApp conversation flows entirely from the web UI — no
SQL fixtures needed. Sidebar gets a "Flows" entry (hidden for
non-beta accounts), the /flows list page surfaces existing flows,
/flows/[id] is the linear-list editor.
Wraps the runner from PR 2 with everything a real user needs to
build the welcome-menu example end-to-end.
What landed:
1. `src/lib/flows/validate.ts` — pure validator. Checks entry
node exists, all next_node_key refs resolve, no unreachable
nodes, Meta-limit violations (button title ≤20, ≤3 buttons,
≤10 list rows, ≤24 chars per list row). 24 unit tests.
2. `src/app/api/flows/route.ts` — GET (list user's flows),
POST (create draft).
3. `src/app/api/flows/[id]/route.ts` — GET (load with nodes),
PUT (replace name + trigger + nodes; delete-then-insert),
DELETE (cascade clean-up).
4. `src/app/api/flows/[id]/activate/route.ts` — status toggle.
Activation runs the validator; returns 422 + the full issue
list when blocked.
5. `src/app/(dashboard)/flows/page.tsx` — list of cards, "New
flow" dialog, delete with confirm.
6. `src/app/(dashboard)/flows/[id]/page.tsx` — editor shell
that loads data and hands it to FlowBuilder.
7. `src/components/flows/flow-builder.tsx` — the editor itself.
Header with name + save/activate/pause/delete; trigger
panel; entry-node picker; node list with expandable per-node
config forms (start, send_buttons, send_list, send_message,
handoff, end); bottom validation panel that mirrors what the
server's activate endpoint would reject.
8. `src/components/layout/sidebar.tsx` — Flows entry between
Automations and Settings, rendered only when isFlowsEnabled.
Every API route + page is gated server-side by isFlowsEnabled —
non-beta accounts get 404 (not 403) so the routes don't even hint
at existing. UI gate is for snappy redirect; security is at the
API layer.
Validation: 166/166 tests pass (added 24 validator tests);
typecheck + lint + build all clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
